光环境和温度对商陆净光合速率、蒸腾速率和瞬时水分利用效率的协同影响


王强1,张欣薇2,黄英金1,邵东2,杨小龙3,叶子飘4,*,钟平安1,2,*
1江西农业大学作物生理生态与遗传育种教育部重点实验室, 南昌330045;2江西农业大学生物科学与工程学院, 南昌330045;3复旦大学环境与工程系, 上海200433;4井冈山大学数理学院, 江西吉安343009

通信作者:叶子飘;E-mail: yezp@jgsu.edu.cn;钟平安;E-mail: zpa778210@163.com

摘 要:

为研究商陆(Phytolacca americana)在不同光环境和温度下净光合速率(Pn)、蒸腾速率(Tr)和瞬时水分利用效率(WUEinst)的响应规律及其协同影响, 选用之前构建的光合作用对光响应的机理模型和瞬时水分利用效率对光的响应模型分别拟合了光合作用对光响应曲线(Pn-I)和瞬时水分利用效率对光响应曲线(WUEinst-I), 同时采用线性方程拟合蒸腾速率对光响应曲线(Tr-I)。结果表明: 在室外和大棚的光照和温度条件下, 商陆的PnTr和WUEinst都存在显著差异。室外商陆的PnTr比大棚的高, 光合作用增强, 但WUEinst比大棚的低。由Pn-I曲线确定的商陆饱和光强(Isat)远大于由WUEinst-I曲线确定的Isat, 表明在室外或大棚环境下商陆的Pn和WUEinst并不是同步发生的。因此, 商陆通过调控其蒸腾速率以适应高温和高光强环境。同时, 它通过提高水分利用效率, 增强碳同化的能力, 进而表现出更强的抗逆性和适应性。


关键词:商陆; 蒸腾速率; 水分利用效率; 光合作用; 饱和光强

收稿:2019-12-11   修定:2020-12-06

资助:国家自然科学基金(31960054)

Synergistic effects of light environment and temperature on net photosynthetic rate, transpiration rate and instant water-use efficiency of Phytolacca americana

WANG Qiang1, ZHANG Xinwei2, HUANG Yingjin1, SHAO Dong2, YANG Xiaolong3, YE Zipiao4,*, ZHONG Ping’an1,2,*
1Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China; 2School of Biological Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China; 3Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; 4College of Math & Physics, Jinggangshan University, Ji’an, Jiangxi 343009, China

Corresponding author: YE Zipiao; E-mail: yezp@jgsu.edu.cn; ZHONG Ping’an; E-mail: zpa778210@163.com

Abstract:

In order to investigate the response-light rules and synergistic effects of net photosynthetic rate (Pn)、transpiration rate (Tr) and instant water-use efficiency (WUEinst) of Phytolacca americana under different light environment and temperature, the light-response curves of photosynthesis (Pn-I) and light-response curves of the instantaneous water-use efficiency (WUEinst-I) were simulated by a mechanism model of Pn-I  and a model of WUEinst-I, respectively. Meanwhile, light-response curves of the transpiration rate (Tr-I) were fitted by a linear equation. The results showed that the significant differences between Pn, Tr and WUEinst of P. americana in outdoor and greenhouse were observed, respectively. The values of Pn and Tr of P. americana in outdoor were higher than those in greenhouse, enhancing the photosynthesis of plants, whereas the WUEinst was opposite conclusion. The saturation light intensity (Isat) from Pn-I curves of P. americana was much larger than that from WUEinst-I curves. It demonstrated that the Pn-I curves and WUEinst-I curves of P. americana in outdoor and greenhouse were not synchronous. Therefore, the P. americana adapted to high temperature and high light intensity environment by regulating its transpiration rate. At the same time, P. americana increased the ability of carbon assimilation by improving water use efficiency, consequently. It showed the better stress resistance and adaptability.


Key words: Phytolacca americana; transpiration rate; water-use efficiency; photosynthesis; saturation light intensity

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