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Article Abstract
The response of CO assimilation rate () to incident light intensity reflects the efficiency of light utilization. The light intensity dependence of varies widely among different plant species, yet the underlying mechanisms remain poorly understood. To elucidate this issue, we measured the light intensity dependence of gas exchange and chlorophyll fluorescence in twelve tree species. The results indicated that (1) with increasing light intensity, the variation in was closely related to stomatal conductance (), mesophyll conductance (), the maximum velocity of Rubisco carboxylation (), and electron transport rate (ETR); (2) compared with at sub-saturating light, the increase in at saturating light was more strongly associated with and ETR than with and ; and (3) the increase in and from 600 to 2000 μmol photons m s were positively correlated with the maximum capacity of . These findings suggest that is an energy-dependent process that significantly regulates the light intensity dependence of in plants. This provides valuable insights for crop improvement through the manipulation of .
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11990357 | PMC |
| http://dx.doi.org/10.3390/plants14070986 | DOI Listing |
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