Exploration of ready-to-eat soft Bora rice genotypes of Assam for submergence tolerance
2023
Panja, S. | Mondal, K. | Kar, R.K. | Dey, P.C. | Dey, N.
Assamese Bora rice lines are valuable genetic resource for their socio-economic importance and traditional usage. Being lowland rice lines of upper Brahmaputra basin, this group of genotypes also carries genetic potentiality for submergence tolerance which is another valuable aspect of Bora rice. Though a number attempts have been made to investigate their grain quality (softness and ready-to-eat properties), limited studies have recorded for their submergence tolerance. Thus, present study was undertaken to explore submergence tolerance potentiality of a collection of five popular Bora rice lines with reference to the FR13A, the one and only rice genotype that has been utilized for submergence tolerance. Screening for submergence tolerance was done in standard experimental set up keeping the young seedlings of these lines in two subsequent phases (10 days and 20 days) of submergence followed by physio-biochemical analyses and conformation through RT-PCR-based expression study. Further, to unequivocally identify the rice genotypes at molecular level, the genomic DNA of the rice genotypes were amplified for Sub1A loci to detect the associated allelic forms in form of different molecular weight of the amplified products. Almost all the physio-biochemical parameters studied for the test plants in both the phases of submergence showed statistically significant differences from the respective control plants. Among the five rice genotypes, Saudang Bora showed best performance for most of the screening parameters with distinct allelic forms detected for the Sub1A loci.
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