Characterization of thermo sensitive genic male sterile lines to explore the hybrid combinations in rice (Oryza sativa L.)
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Date
2022-08
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G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145
Abstract
The present investigation entitled “Сhаrасterizаtiоn оf Thermо Sensitive Geniс Mаle Sterile Lines tо exрlоre the Hybrid Соmbinаtiоns in Riсe (Оryzаsаtivа L.)” was taken up, to evaluate the twenty-four TGMS lines for different morphological traits and critical sterility/fertility temperatures. The field experiment conducted with twenty-four TGMS lines, nineteen F1’s and four checks in randomized block design with three replications at the Norman E. Borlaug Crop Research Centre of Govind Ballabh Pant University of Agriculture and Technology, Pantnagar during Kharif 2021. The Analysis of Variance revealed the presence of ample amount of variability in the experimental material for all the characters and found highly significant for all the traits viz.,days to 50% flowering, panicle length, plant height, number of tillers per plant, 1000 grain weight, number of grains per panicle, days to maturity and yield per plant. Among all the nineteen F1’s TGMS-17 x PD-18-2, TGMS-12 x PB-2 and TGMS-24 x PD-24 found good for all the desired traits and can be directly used in breeding programmes. Among the twenty-four TGMS lines the minimum critical temperature for fertility was observed in TGMS-5-1, TGMS-7, TGMS-11 and TGMS-16, these lines can be used in hybrid development. Therefore, in Pantnagar situation to get complete sterility these lines should be sown in first fortnight of May. Based on standard heterosis TGMS-17 x PD-18-2 found good for number of tillers per plant and TGMS-24 x PD-24 for 1000 grain weight and yield per plant. These crosses may be suggested for straight use in hybrid breeding. The results of morphological and floral characterization studies showed that TGMS lines viz.,TGMS-11 and TGMS-12, TGMS-12-10-1, TGMS-12-25, TGMS-16-1 and TGMS-24-1 had good desirable traits like ratooning ability, grain type and panicle exsertion for the better extent of outcrossing ability. These lines can be utilized for two-line hybrid rice breeding programme for high heterotic expression and superior yield.