High Risk of the Formation of Milky White Rice Kernels in Cultivars with Higher Potential Grain Growth Rate under Elevated Temperatures
High Risk of the Formation of Milky White Rice Kernels in Cultivars with Higher Potential Grain Growth Rate under Elevated Temperatures
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DOI：
10.1626/pps.14.359
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发表时间：
2011-10-01
影响因子：
2.5
通讯作者：
Nguyen Thi Anh
中科院分区：
文献类型：
--
作者：
Kobata, Tohru;Miya, Norihiko;Nguyen Thi Anh
本研究的目的是探讨在高温条件下，具有较高籽粒干物质增加速率（GIR）的水稻品种是否具有较高的乳白色稻米粒（MWK）比例。用米质选择器判定的MWK值随品种和试验年份的不同而有显著差异。将抽穗后5-7天离穗的品种穗在25、28和33 ℃下进行营养液培养1周。GIR总体上在28摄氏度下最高，并且在该温度下的GIR被认为反映了所有测试的谷物中的潜在GIR。在田间条件下，当灌浆期的温度大约超过25 ℃时，28 ℃下的MWK速率和GIR之间存在密切的相关性。这表明，在高温条件下具有较高GIR潜力的品种具有较高的MWK形成风险。
Our objective was to clarify whether rice cultivars with a higher grain dry-matter increase rate (GIR) under elevated temperature condition show a higher percentage of milky white rice kernels (MWK). The rate of MWK judged using a rice-quality selector significantly varied with the cultivar and experimental year. The spikes of the cultivars detached 5-7 days after heading were solution-cultured with an adequate nutrient supply for one week at 25, 28 and 33 degrees C. GIR was overall the highest at 28 degrees C, and GIR at this temperature was considered to reflect the potential GIR in all the grains tested. There was a close correlation between the rate of MWK and the GIR at 28 degrees C under field conditions when temperatures during the grain-filling period were approximately over 25 degrees C. It was suggested that cultivars with a higher potential GIR under elevated temperature conditions have a higher risk of the formation of MWK.