Constant ratio of Cc to Ci under various CO2 concentrations and light intensities, and during progressive drought, in seedlings of Japanese white birch
Constant ratio of Cc to Ci under various CO2 concentrations and light intensities, and during progressive drought, in seedlings of Japanese white birch
复制标题
日本白桦幼苗在不同 CO2 浓度和光强度下以及渐进干旱期间 Cc 与 Ci 的恒定比率
DOI：
10.1007/s11120-020-00788-x
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发表时间：
2020
影响因子：
3.7
通讯作者：
Tobita Hiroyuki
中科院分区：
文献类型：
--
作者：
Kitao Mitsutoshi;Agathokleous Evgenios;Harayama Hisanori;Yazaki Kenichi;Tobita Hiroyuki
恒定的叶肉导度（gm）和双电阻gm模型（涉及细胞壁和叶绿体的电阻）在较高CO2浓度下达到最大值，不能描述较高CO2浓度下gm随胞间CO2浓度（Ci）增加而减小的现象。Yin等（2020）提出了agm模型，根据该模型，在双抗性gm模型中，叶绿体CO2浓度（Cc）与Ci的比值为常数，可以描述gm随Ci的增加而降低。在本研究中，我们调查了日本白色桦树叶片CcandCi之间的关系，通过同时测量气体交换和叶绿素荧光在不同的CO2浓度，光照强度，并在逐步干旱。在50 ~ 1000 μmol mol-1的环境CO2和50 ~ 2000 μmol m-2s-1的光照强度范围内，Cct与Ci的比值保持不变。在进行性干旱过程中，由于气孔斑块和/或角质层蒸腾作用导致的高估的Ci根据充足灌溉条件下测量的A/Ci响应进行了经验校正（阈值：气孔导度< 0.08 mol H2O m−2s−1）。在进行性干旱（黎明前叶势达到1.5 - 2 MPa）中，Cct与Cidure的比率也保持不变，而与不同盆大小的土壤干燥速率无关。本研究表明，除了细胞组分中扩散阻力的物理相互作用外，还涉及一些生理调节机制来保持Cc：Ciratio恒定。
Constant mesophyll conductance (gm), and two-resistancegmmodel (involved in resistances of cell wall and chloroplast), wheregmreaches maximum under higher CO2concentrations, cannot describe the phenomenon thatgmdecreases with increasing intercellular CO2concentration (Ci) under relatively higher CO2concentrations. Yin et al. (2020) proposed agmmodel, according to which the ratio of chloroplastic CO2concentration (Cc) toCiis constant in the two-resistancegmmodel, which can describe the decreasinggmwith increasingCi. In the present study, we investigated the relationship betweenCcandCiin leaves of Japanese white birch by using simultaneous measurements of gas exchange and chlorophyll fluorescence under various CO2concentrations, light intensities, and during progressive drought. Across the range of ambient CO2from 50 to 1000 μmol mol−1, and light intensities of 50 to 2000 μmol m−2s−1, measured under well irrigation, the ratio ofCctoCikept constant. During the progressive drought, overestimatedCidue to stomatal patchiness and/or cuticular transpiration was empirically corrected (threshold: stomatal conductance < 0.08 mol H2O m−2s−1) from theA/Ciresponse measured under adequate irrigation. The ratio ofCctoCiduring progressive drought (predawn leaf potential reached ≈ − 2 MPa) also remained constant irrespective of soil drying rate in various pot sizes. The present study suggests the involvement of some physiologically regulative mechanisms to keepCc:Ciratio constant, which might act ongmin addition to the physical interaction of diffusive resistances in the cell components.
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CO_2升高和营养限制限制日本白桦(Betula platyphylla var. japonica)叶片光系统II激发能量耗散
DOI：
--
发表时间：
2005
期刊：
Physiological Plantarum 125
影响因子：
--
作者：
Kitao;M.;Koike;T.;Tobita;H.;Maruyama;Y.
通讯作者：
Y.
碳酸酐酶在毛果杨叶肉电导纬度变化中的重要作用。
DOI：
--
发表时间：
2017
期刊：
Plant, Cell and Environment
影响因子：
--
作者：
M. Momayyezi;R. Guy
通讯作者：
R. Guy
影响因子：
3.7
作者：
I. Terashima
通讯作者：
I. Terashima
影响因子：
3.7
作者：
Yin X;Struik PC
通讯作者：
Struik PC
影响因子：
4.9
作者：
Hanba, YT;Shibasaka, M;Katsuhara, M
通讯作者：
Katsuhara, M