The physiological control of stomatal opening by which plants adjust for water availability has been extensively researched.However,the impact of water availability on stomatal development has not received as much att...The physiological control of stomatal opening by which plants adjust for water availability has been extensively researched.However,the impact of water availability on stomatal development has not received as much attention,especially for amphistomatic plants.Therefore,the acclimation of stomatal development in basil(Ocimum basilicum L.)leaves was investigated.Our results show that leaves developed under water-deficit conditions possess higher stomatal densities and decreased stomatal length for both the adaxial and abaxial leaf sides.Although the stomatal developmental reaction to water deficit was similar for the two leaf surfaces,it was proven that adaxial stomata are more sensitive to water stress than abaxial stomata,with more closed adaxial stomata under water-deficit conditions.Furthermore,plants with leaves containing smaller stomata at higher densities possessed a higher water use efficiency.Our findings highlight the importance of stomatal development as a tool for long-term acclimation to limit water loss,with minimal reduction in biomass production.This highlights the central role that stomata play in both the short(opening)and long-term(development)reaction of plants to water availability,making them key tools for efficient resource use and anticipation of future environmental changes.展开更多
Seasonal changes in the photosynthetic characteristics of Ammopiptantus mongolicus (Maxim. )Chen f. were studied. When the net photosynthetic rate decreased with the elevation of air temperature, thestomatal conductan...Seasonal changes in the photosynthetic characteristics of Ammopiptantus mongolicus (Maxim. )Chen f. were studied. When the net photosynthetic rate decreased with the elevation of air temperature, thestomatal conductance and stomatal limitation value tended to decline simultaneously, while the interoellularCO2 concentration was increased. According to the two criteria discriminating the stomatal limitation of Photosynthesis suggeSted by Fmrquhar and Sharkey, the seasonal changes in these parameters indicated that the decrease in Pn may not be due to stomatal factor. These studies proved that the relative contents of the large subunit of Rubisco and the photochemical activities correlated with the seasonal changes in the net photosyntheticrate, whieh may show that these two factors contribute primarily to the seasonal changeS in CO2 assimilation.展开更多
基金This research was funded by Flanders Innovation&Entrepreneurship(Belgium)through project number HBC.2018.2070.
文摘The physiological control of stomatal opening by which plants adjust for water availability has been extensively researched.However,the impact of water availability on stomatal development has not received as much attention,especially for amphistomatic plants.Therefore,the acclimation of stomatal development in basil(Ocimum basilicum L.)leaves was investigated.Our results show that leaves developed under water-deficit conditions possess higher stomatal densities and decreased stomatal length for both the adaxial and abaxial leaf sides.Although the stomatal developmental reaction to water deficit was similar for the two leaf surfaces,it was proven that adaxial stomata are more sensitive to water stress than abaxial stomata,with more closed adaxial stomata under water-deficit conditions.Furthermore,plants with leaves containing smaller stomata at higher densities possessed a higher water use efficiency.Our findings highlight the importance of stomatal development as a tool for long-term acclimation to limit water loss,with minimal reduction in biomass production.This highlights the central role that stomata play in both the short(opening)and long-term(development)reaction of plants to water availability,making them key tools for efficient resource use and anticipation of future environmental changes.
文摘Seasonal changes in the photosynthetic characteristics of Ammopiptantus mongolicus (Maxim. )Chen f. were studied. When the net photosynthetic rate decreased with the elevation of air temperature, thestomatal conductance and stomatal limitation value tended to decline simultaneously, while the interoellularCO2 concentration was increased. According to the two criteria discriminating the stomatal limitation of Photosynthesis suggeSted by Fmrquhar and Sharkey, the seasonal changes in these parameters indicated that the decrease in Pn may not be due to stomatal factor. These studies proved that the relative contents of the large subunit of Rubisco and the photochemical activities correlated with the seasonal changes in the net photosyntheticrate, whieh may show that these two factors contribute primarily to the seasonal changeS in CO2 assimilation.
