Graphical (Wr-Vr) and Numerical Diallel Analyses in Relation to Yield and its Components in Ridge Gourd (Luffa Acutangula Roxb.)

Singh, Jogendra; Munshi, A.D.; Sureja, A.K.; Lyngdoh, Y. A.; Sangwan, Sheela; Tomar, B S

doi:10.20546/ijcmas.2019.811.219

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“…Sponge gourd is cultivated during the spring–summer and kharif seasons in Northern India and throughout the year in Southern India ( Islam et al., 2011 ; Singh et al., 2017 ; Singh et al., 2019a , b ; Nagar et al., 2023 ). Tomato leaf curl New Delhi virus (ToLCNDV) is significantly impacting its cultivation, leading to a complete yield loss (100%) under epidemic conditions ( Sohrab et al., 2003 ; Islam et al., 2010 , 2011 ).…”

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confidence: 99%

Identification of new stable resistant sources and assessing agro-morphological performance of sponge gourd germplasm against Tomato Leaf curl New Delhi Virus incidence

Singh,

Munshi,

Singh

et al. 2024

Front. Plant Sci.

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Tomato leaf curl New Delhi virus (TolCNDV) causes yellow mosaic disease, which poses a significant biotic constraint for sponge gourd cultivation, potentially resulting in crop loss of up to 100%. In the present investigation, 50 diverse genotypes were screened for 3 years under natural epiphytotic conditions. A subset of 20 genotypes was further evaluated across four different environments. The combined analysis of variance revealed a significant genotype × environment interaction. Eight genotypes consistently exhibited high and stable resistance in the preliminary screening and multi-environment testing. Furthermore, genotype plus genotype × environment interaction biplot analysis identified DSG-29 (G-3), DSG-7 (G-2), DSG-6 (G-1), and DSGVRL-18 (G-6) as the desirable genotypes, which have stable resistance and better yield potential even under diseased conditions. The genotype by yield × trait biplot analysis and multi-trait genotype–ideotype distance index analysis further validated the potential of these genotypes for combining higher yield and other desirable traits with higher resistance levels. Additionally, resistant genotypes exhibited higher activities of defense-related enzymes as compared to susceptible genotypes. Thus, genotypes identified in our study will serve as a valuable genetic resource for carrying out future resistance breeding programs in sponge gourd against ToLCNDV.

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