Optimum root zone temperature of photosynthesis and plant growth depends on air temperature in lettuce plants
Optimum root zone temperature of photosynthesis and plant growth depends on air temperature in lettuce plants
复制标题
光合作用和植物生长的最佳根区温度取决于生菜植物的气温
DOI：
10.1007/s11103-022-01249-w
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发表时间：
2022
影响因子：
5.1
通讯作者：
Yamori Wataru
中科院分区：
文献类型：
--
作者：
Yamori Namiko;Levine Christopher P.;Mattson Neil S.;Yamori Wataru
KeymessageThe目前的研究清楚地表明，光合作用和植物生长的最佳根区温度受空气温度的影响，并根据空气生长温度通过冷却系统优化根区温度可以导致提高植物production.AbstractTemperature是影响植物生长和产量的关键因素之一。空气和根区温度都能强烈影响植物的生长和发育。然而，根区温度沿着气温变化对植物生长参数影响的研究还很有限。为优化生菜生长条件，研究了不同根区温度和空气温度对生菜生长、生理指标和光合特性的影响。在本研究中应用了两种空气温度处理（30/25和25/20 °C，白天/夜间温度）和五种根区温度处理（15、20、25、30和35 °C）。本研究表明，生菜植株的最大生长量在30/25 °C的空气温度下高于25/20 °C。当植物在30/25 °C的空气温度下生长时，最佳根区温度似乎为30 °C。然而，当植物在25/20 °C的空气温度下生长时，最适根温降低，似乎为25 °C。此外，30/25 °C下的CO2同化速率、气孔导度、强光下的电子传递速率（ETR）均高于25/20 ° C，而强光下的非光化学猝灭（NPQ）则低于25/20 °C。这些结果表明，有必要根据气温来控制和调节根区温度。
Key messageThe present study clearly showed that the optimum root zone temperature of photosynthesis and plant growth was affected by air temperature, and that optimization of root zone temperature depending on an air growth temperature by cooling systems could lead to improvement of plant production.AbstractTemperature is one of the critical factors affecting plant growth and yield production. Both air and root zone temperatures can strongly affect growth and development of plants. However, studies on the effects of root zone temperature on plant growth parameters along with air temperature are still limited. In the present study, the effects of air and root zone temperature on plant growth, physiological parameters and photosynthetic characteristics of lettuce plants were investigated to optimize the air and root zone temperature to achieve the best growth conditions for lettuce plants. Two air temperature treatments (30/25 and 25/20 °C at day/night temperature) and five root zone temperature treatments (15, 20, 25, 30 and 35 °C) were applied in this study. The present study showed that the maximum plant growth of lettuce plants was higher in air temperatures at 30/25 °C than in 25/20 °C. When the plants were grown at an air temperature of 30/25 °C, the optimum root zone temperature appeared to be 30 °C. However, when the plants were grown at an air temperature of 25/20 °C, the optimum root temperature decreased and appeared to be 25 °C. Furthermore, plants grown under air temperature of 30/25 °C showed greater CO2assimilation rate, stomatal conductance, electron transport rate (ETR) at high light, and lower non-photochemical quenching (NPQ) at high light than those of 25/20 °C. These results suggest that it is necessary to control and adjust the root zone temperature based on the air temperature.