Journal of Taiwan Agricultural Research

Author:Chieh-Wei Kuo, Su-Chen Kuo, Yu-Chia Hsu, and Yong-Pei Wu*

Abstract:

      A total of 130 mutants derived from CNY911303, induced by ethyl methanesulfonate (EMS), were screened for good palatability under the cultivation of traditional chemical practice. Those mutants possessing good palatability were then selected for high yield and blast resistance under organic farming. Eighteen mutants were chosen from the pool. After the evaluation of yield production, two mutants, OR3 and OR4, were selected because of their good palatability and high yield. When compared with ‘Taikeng 9’ (‘TK9’), which palatability score was 54 and yield standard was 100%, the palatability scores of OR3 and OR14 were graded as 57 and 54 and yield increased by 7% and 16%, respectively. These two mutants are considered having the potential to be developed for organic farming. Results showed that stress susceptible and poor yield mutants were dramatically eliminated by placing the mutants in the environment of naturally occurred blast in the first cropping season. When trial mutants were reduced to an extent, yield experiment was applied to select new rice varieties that possess blast resistance, high yielding potential, and high grain quality at the same time. As a result, this study provides valuable information in rice breeding suitable for organic farming.

Key words:Rice, Organic cultivation, Mutant line, Rice blast disease

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