CHARACTERIZATION OF DOUBLED HAPLOID RICE LINES FOR PRODUCTIVITY AND THE PYRAMIDED DROUGHT ADAPTIVE TRAITS
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Date
2023-01-11
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Abstract
Numerous pertinent drought adaptive features control the exceedingly complex phenomenon of drought tolerance. Therefore, the ideal way to improve drought tolerance is to pyramid all the relevant drought adaptive features onto an agronomically superior background. Pyramiding traits using traditional breeding methods takes longer than it does with doubled haploid (DH) technology. Towards pyramiding drought adaptive traits, TIL 14 (Trait introgressed line) having root and water use efficiency traits was crossed with cellular level tolerance donor line, AC 39000 and anthers from the resultant F1 plants were cultured in-vitro and spontaneously developed DH lines were produced previously. In the present study, developed DH lines were phenotyped for pyramided drought adaptive traits such as cellular level tolerance (CLT), root and water use efficiency (WUE) to check whether or not the pyramided traits found in them. Accordingly, wide variability found among DH lines for pyramided drought adaptive traits and
some of the DH lines had all the pyramided traits with the traits value similar to and in some cases, more than the parents. Further, DH lines also showed wider variability for growth and productivity both under aerobic and puddled condition with greater stability. Based on traits value and grain yield, two best DH lines namely, DH-121 and DH-22 were identified as potential lines. When these best DH lines were examined for stress response, they were found to be tolerant to both PEG induced osmotic stress and NaCl induced salinity stress over their susceptible counterparts suggesting the importance of pyramiding drought adaptive traits together.
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