Growth Performance and Antioxidant Enzyme Activities of Advanced Mutant Rice Genotypes under Drought Stress Condition
Zarifth Shafika Kamarudin | Mohd Rafii Yusop | Mahmud Tengku Muda Mohamed | Mohd Razi Ismail | Abdul Rahim Harun
Drought stress affects various physiological and metabolic processes in rice (<i>Oryza sativa</i> L.) plant. Non-availability of high-yielding varieties suitable for cultivation under drought condition lead towards a sharp decline in rice yield. Induce mutation is an essential auxiliary approach to counterpart conventional breeding to produce stress-tolerance rice variety. The current study was aimed to identify two advanced mutant rice genotypes as drought-tolerant using growth parameters and antioxidant enzyme activities. The advanced mutant rice genotypes, <i>MR219-4</i> and <i>MR219-9</i>, showed a minimal reduction on all growth parameters, yield, and yield components measured for drought tolerance. <i>MR219-4</i> had a slight reduction on total dry weight and chlorophyll content under drought stress condition. Proline content increased significantly in drought-tolerant rice genotypes and the highest proline content was obtained from <i>MR219-4</i> followed by <i>MR219-9</i> under drought stress. Catalase, ascorbate peroxidase, and guaiacol peroxidase activities were significantly increased in drought stress treatment in all the rice genotypes. <i>MR219-4</i> and <i>MR219-9</i> were identified as high-yielding drought-tolerant genotypes as they maintained good performance under drought stress condition for all the measured traits compared to the drought-tolerant check varieties, <i>Aeron1</i> and <i>MR219</i>, thus, this might be underlying selection criteria for a drought tolerance rice breeding programme.
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