QTL detection of yield-related traits of cashew

Cavalcanti, J. J. V.; Santos, Francisco Herbeth Costa dos; Silva, Fanuel Pereira da; Pinheiro, Cassia Renata

doi:10.1590/s1984-70332012000100008

Cited by 12 publications

(8 citation statements)

References 22 publications

(16 reference statements)

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“…The average heterozygosity value observed in these accessions is 0.72 suggesting high levels of heterozygosity supporting the fact that cashew is a highly heterozygous species (Borges et al 2018;Hawerroth et al 2019). The number of alleles amplified by all the eight CSSR markers surveyed in the 23 germplasm accessions is two, and it is in slightly less than 2-5 alleles reported in earlier studies (Croxford et al 2006;Cavalcanti et al 2012). A lesser number of alleles detected per locus are likely due to the close genetic relationship among the accessions used in this study.…”

Section: Discussionsupporting

confidence: 73%

Genetic diversity and identification of interspecific hybrids of Anacardium species using microsatellites

et al. 2020

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Study of genetic diversity and interspecific hybridizations plays an imperative role in the genetic improvement of crop plants. Microsatellite or simple sequence repeats (SSRs) markers have been the marker of choice for many genetic studies in perennial tree crops. In this study, genetic diversity of 23 cashew (Anacardium occidentale L.) germplasm accessions with unique traits was carried out using the cashew SSR (CSSR) markers. Besides, true hybridity of the interspecific hybrids of A. occidentale and A. microcarpum Ducke was investigated. Eight of the 21 CSSRs screened in 10 diverse accessions were polymorphic and used for genetic diversity analysis in 23 accessions. Major allele frequency ranged from 0.50 to 0.98; gene diversity ranged from 0.10 to 0.50, and polymorphism information content (PIC) ranged from 0.10 to 0.38 for the surveyed SSR loci. Dendrogram analysis of 23 accessions formed two main clusters with two sub-clusters in each. Clustering of the accessions had no relationship with the geographic region of collection. In tree hybridizations, early screening methods are becoming indispensable to ascertain the true hybridity of progenies to save the costs and resources. For the first time, three CSSR markers that detect the true hybridity of interspecific hybrids of cashew and its wild relative A. microcarpum were identified. Hybrid purity index of the progenies in interspecific crosses varied from 67 to 100%. These three CSSR markers capable of distinguishing the two Anacardium species could be useful in evolutionary studies involving these species and their natural hybrids in the wilds.

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Section: Discussionsupporting

confidence: 73%

Genetic diversity and identification of interspecific hybrids of Anacardium species using microsatellites

et al. 2020

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“…Among other characteristics, he evaluated production (kg ha -1 ) and mean nut weight (g), estimated from a sample of 20 nuts per progeny, where all the nuts from the same sample were weighed together. Cavalcanti et al (2012) evaluated the production potential of 84 cashew clones, estimated genetic parameters and identified Quantitative Trait Loci (QTLs) associated with disease and various plant characteristics, such as production (kg ha -1 ) and nut weight (g). A sample of 20 nuts from each clone was harvested to estimate the weight of the nut, which varied from 4.15 g to 12.48 g, with a mean of 7.41 g. Lima et al (2015) developed a 'simplified protocol' to operationalise the processing of cashew nuts as an aid to the evaluation and selection of progeny from the cashew tree genetic improvement project.…”

Section: Introductionmentioning

confidence: 99%

Sampling of cashew nuts from cashew tree clones

2020

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The aim of this work was to estimate sample sizes to assist the genetic improvement of the cashew tree (Anacardium occidentale L.). Stratified sampling, comprising five strata (S5, S4, S3, S2, and S1) of five cashew clones (BRS 274, BRS 275, BRS 226, BRS 189 and CCP 76), was effective for estimating the different sample sizes of the nut. Sample size for each clone depends on the weight-nut variance, the margin of error B permitted in the estimates and the desired precision of the results. The increases in sample size with clone variance, lowered the permitted margin of error B, and increased the desired precision of the results. These clones required different sample sizes for a morphological study of the nuts. Larger nuts require larger samples for the same margin of error B. For an error B of 0.2g, the sample size for clones S5, S4 and S3 were n5 = 84, n4 = 49 and n3 = 37 nuts. For clones BRS 274 (S5) and BRS 275 (S4), with better nut classification, the mean weights were respectively 16.79 and 12.78g. Clones BRS 189 (S2) and CCP 76 (S1), with smaller nuts, have a smaller variances, s22 = 0.7638 and s12 = 1.0712, where the mean weight was 8.29 and 7.81g respectively.

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“…The fact that the functional markers Rht-D1 and Vrn-A1 were correctly mapped in the genome validates the mapping procedure. The use of mapping populations of reduced size, as was the case in the present study, may allow detection of QTL with major effects, but limits the detection of additional, small, yet real QTL (Beavis 1998, Vales et al 2005, Cavalcanti et al 2012, Wang et al 2012b. Schön et al (2004) recommend the use of a conservative threshold, such as the one used here, if the aim of a study is to identify a few large QTL controlling a limited proportion of the genetic variance.…”

Section: Resultsmentioning

confidence: 99%

QTL mapping of spike fertility index in bread wheat

Alonso

Vanzetti

Crescente

et al. 2021

Crop Breed. Appl. Biotechnol.

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Spike fertility index (SF) is a trait easily measured at maturity and strongly associated with the number of grains per unit area. In order to identify genomic regions involved in SF control, a biparental (Baguette 10 × Klein Chajá) population of 80 recombinant inbred lines (RIL) was used. Seven field trails were conducted to determine the SF BLUP value per RIL. RILs were genotyped using a commercial chip (Axiom® 35K SNP Wheat Breeder's Array, Affimetrix). A linkage map was constructed with 857 SNP markers, and SF QTL mapping was performed. The narrow-sense heritability of SF was 0.89. Three genomic regions (QTL) associated with SF were found on chromosomes 2D, 4A, and 7A. The proportion of genetic variation explained by these three QTL was 32%, with no significant epistatic interaction between QTL.

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QTL detection of yield-related traits of cashew

Abstract: NOTE

Cited by 12 publications

References 22 publications

Genetic diversity and identification of interspecific hybrids of Anacardium species using microsatellites

Genetic diversity and identification of interspecific hybrids of Anacardium species using microsatellites

Sampling of cashew nuts from cashew tree clones

QTL mapping of spike fertility index in bread wheat

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