Khanthavong Phanthasin, Yabuta Shin, Malik Al Imran, Hossain Md Amzad, Akagi Isao, Sakagami Jun-Ichi
The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-0056, Japan.
National Agriculture and Forestry Research Institute, Dong Dok, Ban Nongviengkham, Vientiane 7170, Laos.
Plants (Basel). 2022 Apr 11;11(8):1039. doi: 10.3390/plants11081039.
Environmental responses of stomatal conductance () as basic information for a photosynthesis-transpiration-coupled model have been increasing under global warming. This study identified the impact of behavior under different soil water statuses and temperatures in rice, maize, millet, and sorghum. The experiments consisted of various soil moisture statuses from flooding to drying and combination of soil moisture status and temperature. There was a reduction in shoot biomass of maize and sorghum caused by decreasing of , photosynthesis (), and transpiration () in early imposed waterlogging without dependent temperature, whereas millet and rice were dependent on temperature variation. The effect of gradual soil drying, , , and of maize, millet, and sorghum were caused by low temperature, except rice. The impact of the combination of various soil water statuses and temperatures on is important for the trade-off between and , and consequently shoot biomass. However, we discovered that an ability to sustain is essential for photo assimilation and maintaining leaf temperature through evapotranspiration for biomass production, a mechanism of crop avoidance in variable soil water status and temperature.
作为光合-蒸腾耦合模型基础信息的气孔导度（）对环境的响应在全球变暖的情况下一直在增加。本研究确定了水稻、玉米、小米和高粱在不同土壤水分状况和温度下气孔行为的影响。实验包括从淹水到干燥的各种土壤湿度状况以及土壤湿度状况与温度的组合。在早期施加渍水且不依赖温度的情况下，玉米和高粱的地上部生物量因气孔导度（）、光合作用（）和蒸腾作用（）的降低而减少，而小米和水稻则依赖于温度变化。除水稻外，玉米、小米和高粱因土壤逐渐干燥、气孔导度（）、光合作用（）和蒸腾作用（）受低温影响。各种土壤水分状况和温度组合对气孔导度（）的影响对于气孔导度（）和蒸腾作用（）之间的权衡以及因此对地上部生物量而言很重要。然而，我们发现维持气孔导度（）的能力对于通过蒸散进行光同化和维持叶片温度以进行生物量生产至关重要，这是作物在可变土壤水分状况和温度下的一种避害机制。
