Mesophyll conductance in cotton bracts: anatomically determined internal CO2 diffusion constraints on photosynthesis
نویسندگان
چکیده
منابع مشابه
The mechanistic basis of internal conductance: a theoretical analysis of mesophyll cell photosynthesis and CO2 diffusion.
Photosynthesis is limited by the conductance of carbon dioxide (CO(2)) from intercellular spaces to the sites of carboxylation. Although the concept of internal conductance (g(i)) has been known for over 50 years, shortcomings in the theoretical description of this process may have resulted in a limited understanding of the underlying mechanisms. To tackle this issue, we developed a three-dimen...
متن کاملMesophyll conductance to CO2 in Arabidopsis thaliana.
The close rosette growth form, short petioles and small leaves of Arabidopsis thaliana make measurements with commercial gas exchange cuvettes difficult. This difficulty can be overcome by growing A. thaliana plants in 'ice-cream cone-like' soil pots. This design permitted simultaneous gas exchange and chlorophyll fluorescence measurements from which the first estimates of mesophyll conductance...
متن کاملImportance of mesophyll diffusion conductance in estimation of plant photosynthesis in the field.
Mesophyll diffusion conductance to CO(2) (g(m)) is an important leaf characteristic determining the drawdown of CO(2) from substomatal cavities (C(i)) to chloroplasts (C(C)). Finite g(m) results in modifications in the shape of the net assimilation (A) versus C(i) response curves, with the final outcome of reduced maximal carboxylase activity of Rubisco (V(cmax)), and a greater ratio of the cap...
متن کاملThe mesophyll anatomy enhancing CO2 diffusion is a key trait for improving rice photosynthesis.
Increases in rates of individual leaf photosynthesis (P(n)) are critical for future increases in yields of rice plants. Although many efforts have been made to improve rice P(n) with transgenic technology, the desired increases in P(n) have not yet been achieved. Two rice lines with extremely high values of P(n) were identified among the backcrossed inbred lines derived from the indica variety ...
متن کاملImpact of mesophyll diffusion on estimated global land CO2 fertilization.
In C3 plants, CO2 concentrations drop considerably along mesophyll diffusion pathways from substomatal cavities to chloroplasts where CO2 assimilation occurs. Global carbon cycle models have not explicitly represented this internal drawdown and therefore overestimate CO2 available for carboxylation and underestimate photosynthetic responsiveness to atmospheric CO2. An explicit consideration of ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Experimental Botany
سال: 2018
ISSN: 0022-0957,1460-2431
DOI: 10.1093/jxb/ery296