期刊
PLANT AND SOIL
卷 382, 期 1-2, 页码 17-30出版社
SPRINGER
DOI: 10.1007/s11104-014-2118-5
关键词
Calcium; Lime; Pisum sativum; Phaseolus vulgaris; Stomatal conductance; Xylem sap
资金
- Engineering and Physical Sciences Research Council
- Engineering and Physical Sciences Research Council [1674441] Funding Source: researchfish
- Natural Environment Research Council [ceh010010] Funding Source: researchfish
Liming is considered normal agricultural practise for remediating soil acidity and improving crop productivity; however recommended lime applications can reduce yield. We tested the hypothesis that elevated xylem sap Ca2+ limited gas exchange of Phaseolus vulgaris L. and Pisum sativum L. plants that exhibited reduced shoot biomass and leaf area when limed. We used Scholander and whole-plant pressure chamber techniques to collect root and leaf xylem sap, a calcium-specific ion-selective electrode to measure xylem sap Ca2+, infra-red gas analysis to measure gas exchange of limed and unlimed (control) plants, and a detached leaf transpiration bioassay to determine stomatal sensitivity to Ca2+. Liming reduced shoot biomass, leaf area and leaf gas exchange in both species. Root xylem sap Ca2+ concentration was only increased in P. vulgaris and not in P. sativum. Detached leaves of both species required 5 mM Ca2+ supplied to via the transpiration stream to induce stomatal closure, however, maximum in vivo xylem sap Ca2+ concentrations of limed plants was only 1.7 mM and thus not high enough to influence stomata. We conclude that an alternative xylem-borne antitranspirant other than Ca2+ decreases gas exchange of limed plants.
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