Evaluation of red rot resistance potential of selected clones from segregating progenies of sugarcane (Saccharum Sp. Complex)
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Date
2019-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present investigation entitled “Evaluation of red rot resistance potential of selected clones from segregating progenies of sugarcane (Saccharum sp. Complex)” was conducted with 142 bi-parental and general collection progenies along with five check and two parental varieties to investigate red rot resistance potential, estimation of genetic parameters, correlation and path coefficient, assessment of genetic diversity among clones and revalidation of 56 red rot related SSR markers to aid breeding programmes. The experiment wasconducted in augmented block design- II for two seasons during 2017 to 2019 at N.E.B. Crop Research Centre, G.B.P.U.A.&T.Pantnagar.
Analysis of variance revealed that all the genotypes differed significantly for all the thirteen cane yield and juice quality characters under study. Based on mean performance, clone PC-2013-14-175 was identified as best performer for juice quality characters and PC-2013-14-221 for cane yield contributing characters. High magnitude of GCV, PCV along with high h2b and GAM were recorded for germination percent, number of tillers, NMC, cane yield and CCS yield indicatingthe prevalence of additive gene action in the expression of these characters.
Correlation coefficient study revealed that cane yield exhibited highly significant positive correlation with seven characters viz., germination %, number of tillers, NMC, single cane weight, cane height, cane diameters and CCS yield at both phenotypic and genotypic levels. Path coefficient analysis revealed that CCS yield, sucrose percent and number of millable canes exerted higher positive direct effects on cane yield. CCS yield exerted higher positive indirect effects on cane yield via all the characters under study except through brix percent. The clones were clustered into 18 clusters through Mahalanobis D2 analysis. PC-2013-14-376 (cluster XIII), PC-2013-14-146 (cluster VII) and PC-2013-14-180 (cluster XVII) were identified as most promising clone based on their cluster means for cane yield and juice quality characters and these clones could be used as donors for future breeding programme.
Marker trait association study based on eighteen polymorphic SSR markers revealed that Six markersviz., SMC278CS, RGA129, RGA057, SMs045, RGA281 and RGA152 were found to be tightly associated with red rot resistance by showing presence of bands in resistant clones but absence in susceptible clones. The significant association provides their worth for future use of these markers in marker-assisted selection for red rot resistance in sugarcane.
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