Effects of drought on photosynthesis in grapevines under field conditions: an evaluation of stomatal and mesophyll limitations.
By Jaume Flexas, Josefina Bota, J. Escalona, Bartolomé Sampol, H. Medrano. Functional Plant Biology, 2002
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The effect of diffusional and photochemical limitations to photosynthesis was assessed in field-grown water-stressed grapevines (Vitis vinifera L.) by combined measurements of gas exchange and chlorophyll fluorescence. Drought was slowly induced, and the progressive decline of photosynthesis was examined in different grapevine cultivars along a continuous gradient of maximum mid-morning values of stomatal conductance (g), which were used as an integrative indicator of the water-stress conditions endured by the leaves. Initial decreases of g were accompanied by decreases of substomatal CO2 concentration (Ci), the estimated chloroplastic CO2 concentration (Cc) and net photosynthesis (AN), while electron transport rate (ETR) remained unaffected. With increasing drought, g, AN, Ci and Cc further decreased, accompanied by slight decreases of ETR and of the estimated mesophyll conductance (gmes). Severe drought led to strong reductions of both g and gmes, as well as of ETR. The apparent carboxylation efficiency and the compensation point for CO2 remained unchanged under severe drought when analysed on a Cc, rather than a Ci, basis, suggesting that previously reported metabolic impairment was probably due to decreased gmes.
Subfields: Global and Planetary Change, Plant Science
View Paper: https://www.semanticscholar.org/paper/aa08fe5ff13d7a26375d827f5ac871f816d9214c
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Citations in the corpus
- Transfer conductance in second growth Douglas-fir (Pseudotsuga menziesii (Mirb.)Franco) canopies (2003, background): “2001), simultaneous gas exchange and chlorophyll fluorescence (✧)(Loreto et al. 1992; Loreto et al. 1994; Epron et al. 1995; Roupsard et al. 1996; Flexas et al. 2002), Rubisco content versus gm (¥)(Miyazawa & Terashima 2001).”
- Understanding down-regulation of photosynthesis under water stress: future prospects and searching for physiological tools for irrigation management (2004, methodology): “Moreover, the appearance of non-stomatal limitations usually coincides with decreasing water-use-efficiency at the leaf level, which may have a repercussion for wateruse-efficient irrigation programs (Flexas et al., 2002a,b; Gulías et al., 2002; Medrano et al., 2002).”
- Variability in water use efficiency at the leaf level among Mediterranean plants with different growth forms (2009, methodology): “1 shows how AN/gs changed after imposition of stress, using gs as a reference parameter indicative of the degree of water stress (Flexas et al. 2002).”
- Photosynthesis under stressful environments: An overview (2013, background): “For example, Flexas et al. (2002) showed that P N and C i had a strong correlation with g s in both field-grown and potted grape wine plants.”
- Prospects for crop production under drought: research priorities and future directions (2005, background): “The strength of the relationship between photosynthesis and stomatal conductance has been confirmed by analysing its natural inter- and intraspecific variability (Flexas et al., 2002; Medrano et al., 2002; Hetherington & Woodward, 2003).”
- Deficit Irrigation Alters Grapevine Growth, Physiology, and Fruit Microclimate (2016, background): “Although Ψ md was usually not very low in our study, gas exchange measurements suggested that vines irrigated at less than 100% ET were often under moderate water stress (g s < 150 mmol H 2 O/m 2 s; Flexas et al. 2002, Lovisolo et al. 2010).”
- Mesophyll conductance to CO2: current knowledge and future prospects. (2008, methodology): “…et al. (1998) Weeks (14–42 days) Unaffected gm Delfine et al. (2001, 2002) Weeks (66 days) Decreased gm Delfine et al. (2001, 2002) Weeks (15–60 days) Decreased gm Flexas et al. (2002) Weeks (60 days) Decreased gm Delfine et al. (2005) Weeks (30–80 days) Decreased gm Grassi & Magnani (2005)…”