摘要
非直角双曲线模型(简称模型Ⅰ)是Farquhar、von Caemmerer和Berry提出的生物化学光合模型(简称FvCB生化模型)的主要子模型。在植物光合作用对光响应曲线的拟合中,模型Ⅰ得到广泛的应用和验证。同时,模型Ⅰ也可用于估算植物叶片的最大电子传递速率(J_(max))。然而,由模型Ⅰ估算植物叶片的J_(max)是否与实测值相符,尚未得到严格的验证。该文应用LI-6400-40光合测定仪测定了遮阴和全日照条件下大豆(Glycine max)叶片的光合速率和电子传递速率对光的响应曲线,然后分别用模型Ⅰ和电子传递速率对光响应机理模型(简称模型Ⅱ)进行了拟合。结果表明,由模型Ⅰ估算遮阴和全日照条件下大豆叶片的J_(max)与观测值之间存在显著差异;由模型Ⅱ计算得到的J_(max)与实测值之间不存在显著差异。此外,用模型Ⅰ估算的J_(max)将高估光合电子流分配到光呼吸的量,从而高估光呼吸对植物的光保护作用。因此,在估算植物叶片J_(max)和准确评估光呼吸对植物光保护作用方面,模型Ⅱ更合理。
Aims The non-rectangular hyperbolic model（termed as model I） is the main submodel of the FvCB biochemical model, which is used to estimate the maximum electron transport rate（Jmax） of plant leaves. The submodel is widely applied to fit the light-response curves of electron transport rate（J-Ⅰ curves）, and obtain Jmax. However, it has not been strictly verified whether Jmax calculated by model Ⅰ is consistent with the measured values. Methods Light-response curves of electron transport rate and of photosynthesis rate of soybean（Glycine max）（under shading and full sunlight） were simultaneously measured by LI-6400-40, then these data were simulated by model Ⅰ and the mechanistic model of light-response of electron transport rate（termed as model Ⅱ）. Important findings The results showed that there was the significant differences between Jmax estimated by model I and the observation data irrespective of shading and full sunny leaves of soybean. However, there was no significant difference between Jmax calculated by model Ⅱ and the measured value. Because Jmax was overestimated by model Ⅰ, it must lead to overestimate the amount of photosynthetic electron flow to allocate to photorespiration pathway, and magnify the photoprotection of photorespiration on plants. On the contrary, the Jmax and saturation light intensity（PARsat） obtained by the model Ⅱ were in very close agreement with the observations. It can be concluded that the model Ⅱ was superior to the model Ⅰ in estimates of Jmax and PARsat. Therefore, we recommend model Ⅱ to be used as an operational model for fitting J-I curves and accurately assess the role of photorespiration on plant photo-protection.
作者
叶子飘
段世华
安婷
康华靖
YE Zi-Piao;DUAN Shi-Hua;AN Ting;and KANG Hua-Jing(College of Math and Physics, Jinggangshan University, Ji＇an, Jiangxi 343009, China;School of Life Sciences, Jinggangshan University, Ji ＇an, Jiangxi 343009, China;Wenzhou Academy of Agricultural Sciences, Wenzhou, Zhejiang 325006, China)
出处
《植物生态学报》
CAS
CSCD
北大核心
2018年第4期498-507,共10页
Chinese Journal of Plant Ecology
基金
国家自然科学基金项目(31560069)~~
