An Investigation on the Etiology and Characterization of Fungal Diseases of Gerbera

Nagella, Praveen; Vijayaraghavan, Reshmy; Kumar, K. Ajith; James, Deepa

doi:10.20546/ijcmas.2017.606.240

Cited by 1 publication

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“…In the present study, the exploration of genetic variation and transferability of key fruit quality traits within the parental and progeny population of ‘RB2’ x ‘Sunrise Solo’ genotypes indicated high heritability (> 60%) for flesh sweetness, fruit width and fruit firmness (Additional file 2: Table S2). This confirmed the high heritability of several fruit traits previously described for flesh sweetness, flesh colour, flesh firmness, fruit firmness and fruit size in papaya [53, 63] and other fruit crops [7, 58]. Whereas, the rest of traits showed low to moderate heritability (30–60%) and the lowest heritability was found in fruit weight (32%).…”

Section: Discussionsupporting

confidence: 88%

Linkage mapping and quantitative trait loci analysis of sweetness and other fruit quality traits in papaya

et al. 2019

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BackgroundThe identification and characterisation of quantitative trait loci (QTL) is an important step towards identifying functional sequences underpinning important crop traits and for developing accurate markers for selective breeding strategies. In this study, a genotyping-by-sequencing (GBS) approach detected QTL conditioning desirable fruit quality traits in papaya.ResultsFor this, a linkage map was constructed comprising 219 single nucleotide polymorphism (SNP) loci across 10 linkage groups and covering 509 centiMorgan (cM). In total, 21 QTLs were identified for seven key fruit quality traits, including flesh sweetness, fruit weight, fruit length, fruit width skin freckle, flesh thickness and fruit firmness. Several QTL for flesh sweetness, fruit weight, length, width and firmness were stable across harvest years and individually explained up to 19.8% of the phenotypic variance of a particular trait. Where possible, candidate genes were proposed and explored further for their application to marker-assisted breeding.ConclusionsThis study has extended knowledge on the inheritance and genetic control for key papaya physiological and fruit quality traits. Candidate genes together with associated SNP markers represent a valuable resource for the future of strategic selective breeding of elite Australian papaya cultivars.

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