00000caa a22000003i 4500 UP-1685594773862408539 Buklod 20210325124024.0 m | | ta 210325s2019 xx r |||| u|eng d (iLib)UPBAG-00039569159 BAG rda eng ARTICLE-2894 Palanog, Alvin D. author. Development of selection criteria and strategies for organic rice breeding by Alvin D. Palanog, Cherryl U. Seville, Cielo Luz C. Mondejar, Le-Ann G. Dogeno, Gerald E. Bello, Albert Christian S. Suñer, May Osano-Palanog, and Leo T. Sta. Ines. 2019. pages 777-787 26 cm text rdacontent unmediated rdamedia volume rdacarrier Includes bibliographical references (pages 786-787) Organic agriculture is still largely dependent on the varieties produced in the conventional system, which may or may not be suitable for the practice. A two-year study was conducted to assess the performance of various rice genotypes under different input systems [conventional (CS), organic (OS), and zero (ZS)] and in various farmers? organic practices. The study examined genotypes by organic management practices (GxE) interaction and investigated the need for a separate breeding program for organic rice. This study is very useful to plant breeders in developing rice varieties suited for organic production system. Analysis of grain yield revealed a highly significant genotypic variance in each input system and GxE variance. The response of genotypes differs on each input system. Genotypic and phenotypic correlation analysis between OS and CS showed low correlation. The low indirect correlated response implies that selection for organic rice is effective if conducted under OS rather than CS. These support the need for a separate breeding program for organic rice varieties. The GxE interaction for grain yield across farmers? organic management practices showed a highly significant effect, indicating a very variable response of genotypes across management practices, which emphasized the importance of developing varieties specific for the unique practices of organic farmers. Direct phenotypic selection for grain yield would not be very effective due to the moderately low broad sense heritability (H) values (53?56%). Path analysis showed that the number of spikelets has the highest direct effect (0.70) to grain yield during the wet season, whereas plant height (0.47) and biomass (0.46) hold sway during the dry season. Direct phenotypic selection for these traits, given their high H value and genetic advance, will significantly contribute to grain yield but seasonal variation should be considered. (Author's abstract) Genotypes by organic input system interaction. Response of genotypes to organic input system. Organic rice breeding. Rice breeding for low-input system. Selection criteria for organic rice. Seville, Cherryl U. author. Mondejar, Cielo Luz C. author. Dogeno, Le-Ann G. author. Bello, Gerald E. author. Suñer, Albert Christian S. author. Osano-Palanog, May author. Sta. Ines, Leo T. author. The Philippine Journal of Science Vol. 148, no. 4, December 2019. Request full-text access via UPB University Library through https://forms.gle/KZjBv7aRtY6jiL5E9 (viewed 25 March 2021) FI UPBAG UPBAG-MAIN ARTICLE-2894 Analytics