Responses of leaf stomatal density to water status and its relationship with photosynthesis in a grass

By Zhenzhu Xu, Guangsheng Zhou. Journal of Experimental Botany, 2008

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Responses of plant leaf stomatal conductance and photosynthesis to water deficit have been extensively reported; however, little is known concerning the relationships of stomatal density with regard to water status and gas exchange. The responses of stomatal density to leaf water status were determined, and correlation with specific leaf area (SLA) in a photosynthetic study of a perennial grass, Leymus chinensis, subjected to different soil moisture contents. Moderate water deficits had positive effects on stomatal number, but more severe deficits led to a reduction, described in a quadratic parabolic curve. The stomatal size obviously decreased with water deficit, and stomatal density was positively correlated with stomatal conductance (gs), net CO2 assimilation rate (An), and water use efficiency (WUE). A significantly negative correlation of SLA with stomatal density was also observed, suggesting that the balance between leaf area and its matter may be associated with the guard cell number. The present results indicate that high flexibilities in stomatal density and guard cell size will change in response to water status, and this process may be closely associated with photosynthesis and water use efficiency.

Subfields: Global and Planetary Change, Plant Science

View Paper: https://www.semanticscholar.org/paper/c1653c122878f17d5186ad90ead111e2de9d1470

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Citations in the corpus

Effects of drought and salt stresses on growth, stomatal conductance, leaf water and osmotic potentials of melon genotypes (Cucumis melo L.) (2012, background): “Levitt (1972), Ashraf and Oleary (1996), Anyia and Herzog (2004), Xu and Zhou (2008), and Echevarrıa-Zomeno et al. (2009) have suggested that leaf water potential may Kusvuran 779 differentiate between resistant and sensitive cultivars of different crops.”
Review: the interaction between rootstocks and cultivars (Vitis vinifera L.) to enhance drought tolerance in grapevine (2014, background): “thereby affecting leaf growth, and that they consequently cause variability in stomatal density and size that is closely related to leaf gas exchange and water use efficiency (Xu and Zhou 2008).”
Regulation of Transpiration to Improve Crop Water Use (2009, background): “Severe water stress reduced stomatal density, but moderate stress increased stomatal density in leaves of the xerophilous grass Leymus chinensis (Xu and Zhou, 2008).”
Evaluation of leaf features in forest trees: Methods, techniques, obtainable information and limits (2015, background): “Drought stress is thought to cause an increase in the number of stomata per unit area, although stomatal size decreases (Xu and Zhou, 2008).”
Acquisition and Homeostasis of Iron in Higher Plants and Their Probable Role in Abiotic Stress Tolerance (2018, background): “Stomatal density also deteriorate under severe drought conditions (Xu and Zhou, 2008; De Micco and Aronne, 2012).”
Physiological responses to drought stress in wild relatives of wheat: implications for wheat improvement (2017, result): “This result is on par with another study (Xu and Zhou 2008) where a reduction in Gs occurred as a result of water stress.”
Variation of stomatal traits from cold-temperate to tropical forests and association with water use efficiency (2018, positive): “Counterintuitively, gmax can be higher for plants grown under lower water status (Fraser, Greenall, Carlyle, Turkington, & Friedman, 2009; Xu & Zhou, 2008), which has been considered to reflect the advantage in such plants of achieving higher rates of gas exchange in the shorter period in which…”
Asymmetric sensitivity of ecosystem carbon and water processes in response to precipitation change in a semi‐arid steppe (2017, background): “These studies have found that NEE is significantly suppressed by reduced precipitation, due to a greater decrease in GEP than ER under drought condition (Xu & Zhou 2008; Wu et al. 2011).”
Photosynthesis under stressful environments: An overview (2013, background): “Several researchers have proposed the use of stomatal conductance (g s ) as an indicator to assess the difference between stomatal and nonstomatal limitations to photosynthesis under water-limited environments (Xu and Zhou 2008, Yu et al. 2008).”