Stomata coordinate with plant hydraulics to regulate transpiration response to vapour pressure deficit in wheat
Citation
Source Title
DOI
ISSN
Faculty
School
Collection
Abstract
Genotypic variation in transpiration (Tr) response to vapour pressure deficit (VPD) has been studied in many crop species. There is debate over whether shoots or roots drive these responses. We investigated how stomata coordinate with plant hydraulics to mediate Tr response to VPD and influence leaf water status in wheat (Triticum aestivum L.). We measured Tr and stomatal conductance (gs) responses to VPD in well-watered, water-stressed and de-rooted shoots of eight wheat genotypes. Tr response to VPD was related to stomatal sensitivity to VPD and proportional to gs at low VPD, except in the water-stressed treatment, which induced strong stomatal closure at all VPD levels. Moreover, gs response to VPD was driven by adaxial stomata. A simple linear Tr response to VPD was associated with unresponsive gs to VPD. In contrast, segmented linear Tr to VPD response was mostly a function of gs with the breakpoint depending on the capacity to meet transpirational demand and set by the shoots. However, the magnitude of Tr response to VPD was influenced by roots, soil water content and stomatal sensitivity to VPD. These findings, along with a theoretical model suggest that stomata coordinate with plant hydraulics to regulate Tr response to VPD in wheat.
Related items
Showing items related by title, author, creator and subject.
-
Kamululdeen, J.; Yunusa, I.; Bruhl, J.; Prychid, C.; Zerihun, Ayalsew (2016)Okra (Abelmoschus esculentus) and tomatoes (Lycopersicum esculentum) were grown in saline (3.0 dS m-1 NaCl) and non-saline soil and irrigated with saline (2.4 dS m-1 NaCl) or non-saline water to determine the response of ...
-
Gunasekera, Chandra Padmini (2003)Indian mustard (Brassica juncea L.) has recently been identified as a potential and profitable alternative oilseed crop in the grain growing regions of Australia. To date, no research has been reported on adaptation of ...
-
Figueroa-Bustos, V.; Palta, J.A.; Chen, Y.; Stefanova, Katia ; Siddique, K.H.M. (2020)In the Mediterranean-type environment of Australia and other parts of the world, end-of- season or terminal drought is the most significant abiotic stress affecting wheat grain yields. This study examined the response of ...