Functional Plant Breeding Journal

SELECTION OF PEACH GENOTYPES WITH LOW CHILLING REQUIREMENTS VIA MIXED MODELS

2023-04-25T23:09:54+00:00

A good selection of genotypes that show proper stability and adaptability in the characters of interest is crucial to obtaining elite cultivars. In this way, the objective of this work was to study, via mixed models, the performance of advanced selections of peach trees with low chilling requirements. Sixteen advanced peach selections from the EPAGRI Drupaceae breeding program were evaluated during three crops (2017, 2018, and 2019) and at two sites with different altitudes (220 m and 360 m). The characters evaluated were: yield (t.ha-1), maturation cycle (days), average fruit mass (g), soluble solids (°BRIX), and titratable acidity (%). They were analyzed via mixed models that use variance estimates obtained by the REML method (restricted maximum likelihood) by the SELEGEN – REML/BLUP program. Several genotypes showed good performance for the assessed characteristics, where sel. 0574 stood out as it obtained a good yield, high sugar content, and a good sugar/acidity ratio. Selections 0184, 0574, 0374, and 0791 present better performances for fruit yield, such as stability and adaptability (HMGV, RPGN, and HMRPGN). For the traits yield and average fruit mass, the effects of the environment do not change the behavior of the selections, making the genotypes representative of the region of interest.

BRS FS313: JALO TYPE COMMON BEAN CULTIVAR WITH LARGE BEANS AND HIGH YIELD

2023-04-25T23:25:18+00:00

BRS FS313 is a common bean cultivar with high yield (3,200 kg.ha-1), jalo type bean grain, and greater 100-seed weight (50 g). It has a semi-early cycle, semi-upright plant architecture, and resistance to anthracnose and to root rots. BRS FS313 is recommended for the Central and South-Central regions of Brazil

MORPHO-AGRONOMIC GENETIC DIVERSITY IN COMMON BEAN LANDRACES BASED ON BLUP VALUES

2023-04-25T23:38:56+00:00

The objective of the research was to evaluate morpho-agronomic of genetic diversity in common bean landraces based in predicted genotypic values, to identify divergent genotypes with agronomic potential in several traits for selection activities and crosses in the breeding program. Traits evaluated were plant height, branches per plant, days to flowering, days to maturity, pods per plant, seeds per pod, seeds mass and grain yield at Nampula Research Station, Mozambique, in an augmented design with four blocks, 27 genotypes (24 landraces and 3 checks). Data were subjected to analysis of deviance, variance components and genetic parameters. The genotypic values were estimated by REML/BLUP mixed model and were used in heat map clustering, pairwise distances and constellation plot. The results indicated genetic variability for all traits except branches per plant and showed six clusters of divergent genotypes. Days to flowering, pods per plant and plant height, had the highest contribution to genetic divergence. The morpho-agronomic analysis of genetic diversity in common bean landraces based in predicted genotypic values allowed to identify divergent genotypes with agronomic potential in several traits for selection activities and crosses in the breeding program

SELECTION BETWEEN WATERMELON (CITRULLUS LANATUS) ACCESSIONS VIA THEIR ASSOCIATED MICROBIOTA

2023-04-25T23:43:43+00:00

Microbiome engineering, which can improve the functional capabilities of native microbial species under challenging agricultural ambiance, is an emerging biotechnological strategy to improve crop yield and resilience against biotic and abiotic environmental constraints. In this study, the microbial community structure in the rhizosphere of 7 watermelon accessions was monitored using the soil dilution plating technique on specific media. All accessions tested were screened for their root growth before planting to select accessions with an improved root system. The fruit production was determined at four months post-planting. The total soluble solids (TSS) content was measured on flesh of sampled fruits. The dendrogram of hierarchical ascending classification clustered watermelon accessions into two main groups. The 1st cluster comprised two accessions P1 and P8 which were characterized by the highest abundance of actinomycetes and Aspergillus spp. communities in their rhizopshere, the highest weight of fruits with sweet taste. The current study clearly demonstrated that the soil microbial community structure has been shaped by Citrullus lanatus accessions. Future watermelon breeding programs will be focused on the selection of accessions that are quite able to exploit these associated beneficial microbial communities for enhanced growth and improved resistance to associated biotic stresses.

PERFORMANCE OF EARLY-CYCLE SOYBEAN GENOTYPES FOR USE IN A SUGARCANE ROTATION SYSTEM

2023-04-25T23:50:11+00:00

Sugarcane and soybean are relevant crops for Brazilian agribusiness, and the demand for their products and by-products is growing worldwide. The Soybean x Sugarcane (SSC) production system operates with high efficiency and contributes to the sustainability of agribusiness. Soybean cultivars suitable for use in SSC must have an early cycle, adaptation to the edaphoclimatic region, and high yield. The Value of Cultivation and Use (VCU) assays are conducted in different edaphoclimatic regions, to identify promising soybean genotypes in an advanced stage of inbreeding. The objective of this work was to identify soybean genotypes with high adaptability and stability that are possible candidates for registration and protection of new commercial cultivars, for use in the SSC system in the São Paulo State, Brazil. Twenty genotypes and four commercial cultivars were evaluated in six environments, in a randomized block design with three replications. To verify adaptability and stability, the AMMI method was used. Using the adopted methodology, it was possible to identify superior genotypes for SSC that showed good adaptability and general stability between the evaluated environments, being possible recommendable candidates for SSC in the edaphoclimatic regions in which they were evaluated.

COMBINING ABILITIES OF SPRING WHEAT (Triticum aestivum L.) FOR GRAIN YIELD AND RELATED TRAITS

2023-04-25T23:53:15+00:00

An 8 x 8 F 2 spring wheat (Triticum aestivum L.) half diallel population with respective parents was assessed in a field trial at the field laboratory of the department of genetics and plant breeding at the Bangladesh Agricultural University, Mymensingh, during the period from November 2016 to April 2017, following a randomized complete block design (RCBD). The research objectives were to discover the combining abilities of grain yield and its associated traits. Significant variations among the genotypes were observed for different traits viz., number of spikes plant-1, length of spike (cm), number of spikelets spike-1, plant height (cm), straw grain weight (gm), number of grains spike-1, 1000 grain weight (gm), yield plant-1 (gm), harvest index (%), and grain yield in hectare. The genetic analysis following Griffing’s approach revealed significant additive and non-additive gene actions, with a preponderance of both additive and non-additive genetic components for regulating different traits. For grain yield plant-1 BARI Gom 27 and Kheri were observed as the best general combiners whereas BARI Gom 21 × BARI Gom 27 and Kheri × BARI Gom 30 exhibited as the best heterotic patterns. All of the traits investigated had a significant positive correlation with yield plant-1. BARI Gom 21 × BARI Gom 27 and Kheri × BARI Gom 30 were the top yielding cross combinations on the basis of combining ability among the studied genotypes. Those cross combinations may be used for hybrid crop development or to extract transgressive segregants in developing high-yielding bread wheat cultivars.

INTRAPOPULATION RECURRENT SELECTION STRATEGIES IN PLANT BREEDING

2023-04-25T23:55:59+00:00

The conduction of each intrapopulation recurrent selection (IRS) cycle typically requires a few years. There are several factors, with and without the control of plant breeders, that affect the success obtained with the IRS. For it to be more efficient, such factors must be judiciously assessed. In this light, this study aimed to compare a large number of variables involved in the efficiency of the IRS. Selection gain (SG) estimates with the IRS were obtained. Considering different variables under the control of the breeders such as the following: two types of progenies, half-sib (HS) and full-sib (FS); three experiment evaluation conduction strategies with multiple tree plots (MTP), single tree plots (STP), and clonal progeny test (CPT), and other variables. Variables without the control of plant breeders were also considered: mean allele frequencies of the populations (p); level of dominance (d/a); broad-sense heritability at the individual level (h²). Over 3000 SG estimates were obtained. When the CPT was used, the SG was always higher than that obtained with STP or MTP; the SG when employing HS was always higher than with FS. However, the employment of HS, especially when using clones for the recombination, has the serious restriction of not allowing higher selection intensities and maintaining the same number of progenies in the different IRS calculations. In this context, the employment of FS is more advisable since it allows applying a more significant selection intensity and enables more homogeneous recombination.

ADAPTABILITY AND PHENOTYPIC STABILITY OF UPLAND RICE GENOTYPES IN MOZAMBIQUE

2023-04-26T00:08:41+00:00

The alternative adopted in rice (Oryza sativa L.) breeding programs to decrease the effect of genotype x environment to reduce the effect of the interaction of genotype x environment (G x E), consists in the evaluation of genotypes in different environments and years, for an accurate recommendation of the most stable and adapted genotypes. Therefore, the objective of this work was to evaluate the phenotypic adaptability and stability of the productive upland rice genotypes in Mozambique, using the graphical tool for data analysis, the GGE biplot. We used data on grain yield, derived from the evaluation of five upland rice genotypes from the Rice Genetic Improvement Program of the Institute of Agrarian Research from Mozambique - Northeastern, Zonal Center (IIAM-CZnd). The trials were conducted in the complete block design with four repetitions in the agricultural years 2019/2020, 2020/2021, and 2021/2022. The trials were conducted in a total of five environments divided into three agricultural years, located in northern Mozambique. It was concluded from this work that genotypes G4 and G2 were superior to the overall average for productivity and genotype G3 showed high stability. The genotype G4 can be recommended for all mega-environments, for presenting good adaptability and phenotypic stability.

PHENOTYPIC, GENETIC, AND ENVIRONMENTAL CORRELATIONS IN S1 PROGENIES OF LANDRACE MAIZE

2023-04-26T00:15:35+00:00

Maize (Zea mays L.) belongs to the Poaceae family and stands out among the most cultivated cereals worldwide because of its great economic and social importance. This study aims to estimate and identify phenotypic, genetic, and environmental associations in S 1 maize progenies from the southern Rio Grande do Sul landrace populations. The experimental design was the augmented blocks, with ten S1 progenies groups, and two commercial controls, the simple cross hybrids Pioneer 30F53 and Agroeste 1590, allocated in four repetitions. The S1 progenies were obtained after self-fertilization of random plants in the maize landrace populations, being them: Amarelão, Argentino Branco, Argentino Amarelo, Branco Vermelho Indio, Branco Oito Carreiras, Caiano Rajado, Cateto Branco, Criolão and Dente de Ouro, and the open pollinated variety BRS Planalto. The S 1 progenies present specific genetic and phenotypic correlations in both senses and magnitudes, becoming difficult to define strategies for indirect selection based on correlation between traits. Spike length presents strong and positive genetic and phenotypic correlation with spike mass and may be used for indirect selection of S 1 progenies with greater spike mass, regardless of the origin of the progeny.Positive phenotypic and genotypic correlations of intermediate magnitudes were verified between spike diameter and grain depth, which are similar for all progenies. Plant height reveals strong and positive phenotypic and genetic associations with spike insertion height, however, this trait did not steadily correlate with grain yield.The environmental correlations present significant effects of the phenotypes expression of S1 progenies produced in the southern Rio Grande do Sul.

EFFECT OF AGRONOMIC AND MOLECULAR INFORMATION ON THE GENETIC DIVERSITY OF PASSION FRUIT

2023-12-11T21:59:49+00:00

Genetic divergence study enables a better decision making for the choice of promising and more divergent genotypes for advancing selection cycles. As such, the goals of this study were to evaluate genetic diversity by means of agronomic and molecular traits and to investigate the genetic structure of a population of sour passion fruit, making it possible to select superior and contrasting genotypes. A total of 95 genotypes belonging to 20 half-sib families of sour passion fruit were selected. For molecular traits, 170 microsatellite (SSR) primers and 58 Inter Simple Sequence Reapeats (ISSR) primers were used. On the basis of this information, estimates of genetic diversity parameters, genetic distances, and grouping of genotypes were determined. Lastly,a joint analysis was performed with the groupings of agronomic and molecular information.
A differentiated structuring between phenotypic and molecular groupings was found. It was noticed the formation of five groups for phenotypic traits and three others for SSR and ISSR. The heterozygosity verified was greater than the expected, suggesting a significant number of heterozygous individuals. With respect to the joint analysis, it was verified an entanglement of 0.57 and 0.58, pointing out the divergence in the distribution of genotypes among the dendrograms. There was a greater genetic variability via phenotypic rather than molecular traits. With a view to continuing the breeding program, it is recommended the crossing of genotypes of groups 1, 2, and 5, which show good productivity, with genotypes via ISSR (23, 35, and 75) and SSR (6, 21, 26, 33, 38,
39, 52, 59, and 68).

BRS FC423: COMMON BEAN CULTIVAR WITH CARIOCA TYPE GRAIN WITH SLOW DARKENING, HIGH YIELD, AND HIGH RESISTANCE TO ANTHRACNOSE AND ROOT ROTS

2023-12-11T22:11:44+00:00

BRS FC423 is a common bean cultivar with carioca type grain, slow grain darkening, and high sieve yield. It has a semi-early cycle (75 to 84 days); wide adaptation to different growing regions; high mean yield (2209 kg ha-1), with prominent performance in the Central region (2217kg ha-1); high yield potential (3843 kgha-1); and resistance to root rots and anthracnose.

EVALUATION OF AGRONOMIC POTENTIAL AND GENETIC PARAMETERS OF COMMON BEAN GENOTYPES IN MOZAMBIQUE

2023-12-11T22:32:00+00:00

The present research aims to evaluate the agronomic potential, and estimate genetic parameters in common bean characteristics. The experiments were conducted in the experimental area of the Agrarian Station of Sussundenga (ASS), of the Institute of Agricultural Research of Mozambique (IIAM)-Zonal Center (CZC), Manica Province-Mozambique in the three agricultural seasons (2015/16, 2016/17, and 2017/18). The experiments were evaluated using a randomized block design with three replications and 115 entries of common bean genotypes. The agronomic characteristics evaluated were: the number of days to flowering (DF), number of days to maturity (DM), number of pods per plant (NP), plant height (PH), and grain yield (GY). Individual and joint analysis of variance was performed genetic parameters were subsequently estimated for
all characteristics. The results showed a significant interaction effect for all characteristics. The highest value of the estimate of the coefficient of genetic variation was observed for GY and NP. High heritability among common bean genotypes was observed. A genotypic correlation was demonstrated for PH, NP, and GY. Finally, it was observed that the genotypes have the potential to compose a breeding program and contribute to increasing grain yield.

FORAGE PEANUT VARIABILITY: GENETIC PARAMETERS FOR AGRONOMIC AND NUTRITIVE TRAITS IN TIME-SEPARATE TRIALS

2023-12-11T22:35:45+00:00

Successful breeding programs depend on the information defined through the evaluation of parameters obtained according to the selection strategy, based on the correlated responses among the multiple traits evaluated and the environmental influence. As follows, the objective of this study was to estimate the genetic parameters for agronomic and nutritive traits of forage peanut to subsidize the selection of more adapted genotypes. We evaluated 67 genotypes in three separate trials with two common controls. Agronomic and nutritive data were analyzed using the mixed model methodology (REML/BLUP) for each trial. Genetic parameters were estimated for all the variables and genotypic values served as a basis for checking the genetic correlation among traits. There was genetic variability and environmental influence for the traits analyzed, except for nutritive ones. Individual heritabilities, in general, were low to moderate and the traits of forage production (vigor, height, ground cover, and total and leaves dry matter yields) correlated with each other in the three trials. There is a favorable condition for the selection of agronomic traits, with high accuracy and consistency among trials. There is the possibility of indirect selection with the use of agronomic traits related to forage yield.

DIVERSITY ARRAY TECHNOLOGY (DART) USED FOR MAPPING DROUGHT TOLERANCE IN COMMON BEAN

2023-12-11T22:40:17+00:00

Common bean (Phaseolus vulgaris L.) is an economically important crop principally in developing countries in Latin America, Africa and Asia. Drought is one of the main abiotic stresses worldwide and affects about 60% of the bean growing area. Advances in molecular marker technologies offer powerful methods to examine elationships between traits, generating a large volume of potentially useful information to help breeding programs. This study aimed to use the DArT (Diversity Arrays Technology) platform for common bean together with microsatellites (SSRs) and SNPs (Single Nucleotide Polymorphism) for mapping the AND 277 x SEA 5 population from CIAT (Colombia), and locating QTLs associated with drought tolerance. A total of 4,468 DArTs, 288 SNPs and 180 SSRs were used in genotyping. Phenotyping of the 105 inbred recombinant lines (RILs, F8 generation) was performed by evaluating 18 traits associated with drought tolerance using a completely randomized design with four replications, applying a terminal stress in the vegetative phase V3/V4. Five SSRs, 91 SNPs and 4,468 DARTs were used for QTL detection which was performed through Statistical Machine Learning (SML). Eighteen QTLs were identified for the non-irrigated treatment for vase experiment and 05 QTLs for rhizotron experiment. All QTLs detected under drought conditions had the SEA 5 parent allele. This study is important for genetic improvement not only for a better understanding of the genetic inheritance of such a complex trait as drought tolerance, as well as for finding molecular tools to be used for marker-assisted selection.

AGRONOMIC PERFORMANCE OF LOCAL DRYLAND RICE VARIETIES OF THE FAR WEST OF SANTA CATARINA, BRAZIL

2023-12-11T22:45:29+00:00

Dryland rice varieties are conserved in situ on farm in the far west of the state of Santa Catarina, southern Brazil. The objective of this work was to evaluate the agronomic performance of 34 local dryland rice varieties from this region, which they represent four morphological groups. The experiments were carried out in two municipalities in Santa Catarina (Anchieta and Florianópolis), in complete randomized blocks design with four replications. The differences were significant (p ≤ 0.05) for the effects of genotype, environment, and genotype x environment interaction, for the stem length variable. All other variables showed significant differences for the effects of genotype and interaction and not significant for the environment. Yield, stem length, number of tillers per plant, number of branches and grains per panicle ranged from 1,458.59 to 4,193.80 kg ha-1, 69.2 to 113.1 cm, 2.5 to 4.0 tillers per plant, 8.5 to 10.2 branches and 75.9 to 97 grains, respectively. The highest yield values and stem length were obtained in Florianópolis. Resistance to lodging was greater in Anchieta, local of origin of the varieties. Yield, stem length and the number of grains showed dependence by the chisquare test (p ≤ 0.05), in relation to the conservation time of the varieties by the farmers. Varieties grain medium to medium-elongated and color red, classified as special grains, obtained yields equivalent to the others. The local dryland rice varieties studied show differences in agronomic performance and stability, as well as potential for use as base populations in rice breeding programs.

BRS FP417: BLACK COMMON BEAN CULTIVAR WITH HIGH YIELD, HIGH COMMERCIAL-QUALITY GRAIN, AND DISEASE RESISTANCE

2023-12-11T23:10:02+00:00

BRS FP417 is a common bean cultivar with black bean grain and high yield (2,465 kg ha-1), excellent commercial-quality grain, upright plant architecture, and resistance to lodging. In addition, it has excellent levels of resistance to anthracnose and to Fusarium wilt and intermediate resistance to common bacterial blight and to bacterial wilt.