Characterization of submergence tolerant backcross derived lines of an elite rice variety “Rajendra Sweta
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Date
2022
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Department of Plant Breeding and Genetics, BAU, Sabour
Abstract
The present research work entitled Characterization of submergence tolerant backcross derived lines of an elite rice variety “Rajendra Sweta” was undertaken on the backcross populations developed through Marker Assisted Back-crossed introgression of submergence tolerant Sub1 QTL from donor parent Swarna Sub1 to Rajendra Sweta, a well-adapted, high yielding and preferred rice variety of Bihar state in order to remove its bottleneck of submergence susceptibility. Total of 5 best homozygous plants out of 32 BC2F2 with maximum morphological similarity to Rajendra Sweta were selected to carry out background selection. The highest recurrent parent genome recovery was in plant number BC2F2-RS-126-100-50 (94.81 %) selected for the development of BC2F3. In BC2F3, 45 single plants based on phenotypic similarity to Rajendra Sweta were selected and advanced to BC2F4 generation. Screening for submergence tolerance revealed that all the Sub1 introgressed BC2F4 lines exhibited survival percentage either similar or better than the donor parent Swarna Sub1 and tolerant check FR13A. All the Sub1 introgressed BC2F4 lines of Rajendra Sweta expressed increased rate of ADH and PDC activities and maintained higher level of both soluble (NSC) and insoluble carbohydrate (SC). BC2F4 lines had low chlorophyll degradation compared to Rajendra Sweta. Five backcross derived lines namely BC2F4-RS-24, BC2F4-RS-14, BC2F4-RS-7, BC2F4-RS-18, BC2F4-RS-37 were found better than the recurrent parent Rajenda Sweta in terms of yield, grain and cooking quality traits. Identified backcross derived lines could be further utilized for detailed study related to adaptability under different agro-climatic zones of the state.