Germplasm Innovation of Heat Tolerance in Rice (Oryza sativa) for Irrigated Lowland Conditions in the Philippines

作者：Norvie L. Manigbas, Leslie Angela, F. Lambio, L. B. Madrid, Corazon C. Cardenas · 年份：2014 · 被引用次数：1 · 研究领域：Rice Cultivation and Yield Improvement、Climate change impacts on agriculture、Genetic Mapping and Diversity in Plants and Animals

Rice is highly affected by temperature stress, especially during the reproductive growth stage in which increased spikelet sterility occurs. Temperatures exceeding 35 °C at daytime and > 29 °C at night can cause physiological abnormalities in rice that result in sterility. The Philippines is among the most vulnerable rice-growing countries affected by climate change because of its tropical conditions. The predicted increase in temperature in the rice environment where most Filipinos derive their food needs to be addressed to reduce the adverse effects of temperature stress on rice. The development of new heat-tolerant rice varieties is among the best approaches to address changing climatic conditions in the affected farming communities. Breeding heat-tolerant rice was initiated in 2010 to develop new rice genotypes that can adapt to changing climatic and local farming conditions. High- yielding, modern rice varieties lack tolerance to heat stress, but other varieties can tolerate heat up to > 38 °C. Heat-tolerant varieties, such as N22 and Dular, which were used in this study, usually have low yield potential and undesirable plant characteristics. Thus, combining desirable traits from one parent to another is necessary to obtain new heat-tolerant rice genotypes with high yield potential. In this study, phenotyping and selecting desirable materials from various crosses were performed under high temperature conditions during the reproductive stage. Screening was performed in th...