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Elevated CO 2 modulates the effects of drought and heat stress on plant water relations and grain yield in wheat
Author(s) -
Li Xiangnan,
Kristiansen Karina,
Rosenqvist Eva,
Liu Fulai
Publication year - 2019
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/jac.12330
Subject(s) - anthesis , abscisic acid , stomatal conductance , agronomy , yield (engineering) , cultivar , transpiration , photosynthesis , drought tolerance , grain yield , chemistry , horticulture , biology , botany , materials science , biochemistry , metallurgy , gene
To investigate the interactive effects of drought, heat and elevated atmospheric CO 2 concentration ([ CO 2 ]) on plant water relations and grain yield in wheat, two wheat cultivars with different drought tolerance (Gladius and Paragon) were grown under ambient and elevated [ CO 2 ], and were exposed to post‐anthesis drought and heat stress. The stomatal conductance, plant water relation parameters, abscisic acid concentration in leaf and spike, and grain yield components were examined. Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential. Drought induced a significant increase in leaf and spike abscisic acid concentrations, while elevated [ CO 2 ] showed no effect. At maturity, post‐anthesis drought and heat stress significantly decreased the grain yield by 21.3%–65.2%, while elevated [ CO 2 ] increased the grain yield by 20.8% in wheat, which was due to the changes of grain number per spike and thousand grain weight. This study suggested that the responses of plant water status and grain yield to extreme climatic events (heat and drought) can be influenced by the atmospheric CO 2 concentration.