College of Agriculture, South China Agricultural University, Guangzhou, China.
College of Agronomy and Biotechnology, China Agricultural University, Beijing, China.
Sci Rep. 2019 Jul 23;9(1):10618. doi: 10.1038/s41598-019-47031-9.
Temperature is one of the critical factors affecting rice growth and yield production. This study investigated the effects of rhizosphere temperature at the tillering stage on the growth, physiological parameters and gas exchange attributes of two rice cultivars, i.e., the super rice cultivar Yuxiangyouzhan and the non-super rice cultivar Xiangyaxiangzhan, under hydroponic conditions. Three rhizosphere temperature treatments, i.e., a low-rhizosphere-temperature treatment (LT, nutrient solution at 17.5 ± 1.5 °C), an ambient-temperature treatment (AT, nutrient solution at 27.5 ± 1.5 °C), and a high-rhizosphere-temperature treatment (HT, nutrient solution at 37.5 ± 1.5 °C), were applied in this study. The results showed significant differences in most of the rice growth and physiological and gas exchange parameters as a result of cultivar and rhizosphere temperature as well as their interaction. In addition, the marked reduction in total dry weight was positively correlated with a notable reduction in plant morphological parameters, such as the fresh and dry weight of the leaves and stem sheaths, and changes in gas exchange parameters. Moreover, antioxidant reactions were active in response to high and low rhizosphere temperatures, which varied in different plant tissues. These results suggested that the super and non-super rice were sensitive to high and low rhizosphere temperatures, respectively.
温度是影响水稻生长和产量的关键因素之一。本研究在水培条件下，研究了分蘗期根际温度对超级稻品种育香优占和非超级稻品种香优香占生长、生理参数和气体交换特性的影响。本研究设置了三种根际温度处理，即低根际温度处理（LT，营养液温度 17.5±1.5°C）、常温处理（AT，营养液温度 27.5±1.5°C）和高温根际温度处理（HT，营养液温度 37.5±1.5°C）。结果表明，由于品种和根际温度以及它们的相互作用，水稻的生长和生理及气体交换参数的大多数都有显著差异。此外，总干重的明显减少与植物形态参数的显著减少呈正相关，如叶片和叶鞘的鲜重和干重，以及气体交换参数的变化。此外，抗氧化反应在高、低温根际条件下都很活跃，不同的植物组织表现出不同的变化。这些结果表明，超级稻和非超级稻对高温和低温根际分别敏感。
