Development and evaluation of resilient black scented rice genotypes for water deficit environments
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Chakhao amubi is a black scented rice variety particularly valued for its delicacy, pleasant aroma, and therapeutic properties. This study aimed to develop drought-tolerant versions of Chakhao amubi through marker-assisted backcross breeding. The research developed 8 BC 3 F 1 progenies incorporating three drought-tolerant QTLs from Apo ( qDTY1.1 , qDTY2.1 , and qDTY6.1 ), achieving 89% to 98% recovery of the recurrent parent genome. Agronomic evaluation of twelve backcross inbred lines (BILs) containing drought QTLs in various combinations from the BC 3 F 4 progenies, demonstrated yields exceeding 50 g per plant, significantly surpassing Chakhao amubi 's yield of 26.25 g per plant. These BILs demonstrated enhanced tolerance to dehydration stress induced by PEG6000 (-0.05 MPa), exhibiting significantly less reduction in shoot and root growth compared to the recurrent parent. The multi-environment analysis identified two BILs, P 83 − 17 and P 108-1-10, as stable across seasons and under natural drought conditions, making them suitable for release as improved Chakhao amubi varieties for drought-prone regions.
