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Effect of summer warming on growth, photosynthesis and water status in female and male Populus cathayana: implications for sex-specific drought and heat tolerances.

Identifieur interne : 000448 ( Main/Exploration ); précédent : 000447; suivant : 000449

Effect of summer warming on growth, photosynthesis and water status in female and male Populus cathayana: implications for sex-specific drought and heat tolerances.

Auteurs : Junyan Liu [République populaire de Chine] ; Rong Zhang [République populaire de Chine] ; Xiao Xu [République populaire de Chine] ; Joshua C. Fowler [États-Unis] ; Tom E X. Miller [États-Unis] ; Tingfa Dong [République populaire de Chine]

Source :

RBID : pubmed:32478381

Descripteurs français

English descriptors

Abstract

Effects of climate warming on tree growth and physiology may be driven by direct thermal effects and/or by changes in soil moisture. Dioecious tree species usually show sexual spatial segregation along abiotic gradients; however, few studies have assessed the sex-specific responses to warming in dioecious trees. We investigated the sex-specific responses in growth, photosynthesis, nonstructural carbohydrate (NSC), water-use efficiency and whole-plant hydraulic conductance (KP) of the dioecious tree species Populus cathayana Rehd. under +4 °C elevated temperature with and without supplemental water. For both sexes, high-temperature treatments significantly decreased growth (height and biomass), photosynthetic rate (A), the ratio of A to dark respiration rate, stomatal conductance (gs), transpiration rate, NSC, leaf water potential and KP, but increased water-use efficiency (estimated from carbon isotope composition). Under warming with supplemental water, most traits of females did not change relative to ambient conditions, but traits of males decreased, resulting in greater sexual differences. Females showed a lower KP, and their gs and A responded more steeply with water-related traits than males. These results show that the effect of summer warming on growth and photosynthesis was driven mainly by soil moisture in female P. cathayana, while male performance was mainly related to temperature. Females may experience less thermal stress than males due to flexible water balance strategy via stomata regulation and water use.

DOI: 10.1093/treephys/tpaa069
PubMed: 32478381


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">Effects of climate warming on tree growth and physiology may be driven by direct thermal effects and/or by changes in soil moisture. Dioecious tree species usually show sexual spatial segregation along abiotic gradients; however, few studies have assessed the sex-specific responses to warming in dioecious trees. We investigated the sex-specific responses in growth, photosynthesis, nonstructural carbohydrate (NSC), water-use efficiency and whole-plant hydraulic conductance (KP) of the dioecious tree species Populus cathayana Rehd. under +4 °C elevated temperature with and without supplemental water. For both sexes, high-temperature treatments significantly decreased growth (height and biomass), photosynthetic rate (A), the ratio of A to dark respiration rate, stomatal conductance (gs), transpiration rate, NSC, leaf water potential and KP, but increased water-use efficiency (estimated from carbon isotope composition). Under warming with supplemental water, most traits of females did not change relative to ambient conditions, but traits of males decreased, resulting in greater sexual differences. Females showed a lower KP, and their gs and A responded more steeply with water-related traits than males. These results show that the effect of summer warming on growth and photosynthesis was driven mainly by soil moisture in female P. cathayana, while male performance was mainly related to temperature. Females may experience less thermal stress than males due to flexible water balance strategy via stomata regulation and water use.</div>
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<name sortKey="Dong, Tingfa" sort="Dong, Tingfa" uniqKey="Dong T" first="Tingfa" last="Dong">Tingfa Dong</name>
<name sortKey="Dong, Tingfa" sort="Dong, Tingfa" uniqKey="Dong T" first="Tingfa" last="Dong">Tingfa Dong</name>
<name sortKey="Liu, Junyan" sort="Liu, Junyan" uniqKey="Liu J" first="Junyan" last="Liu">Junyan Liu</name>
<name sortKey="Xu, Xiao" sort="Xu, Xiao" uniqKey="Xu X" first="Xiao" last="Xu">Xiao Xu</name>
<name sortKey="Zhang, Rong" sort="Zhang, Rong" uniqKey="Zhang R" first="Rong" last="Zhang">Rong Zhang</name>
<name sortKey="Zhang, Rong" sort="Zhang, Rong" uniqKey="Zhang R" first="Rong" last="Zhang">Rong Zhang</name>
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<country name="États-Unis">
<region name="Texas">
<name sortKey="Fowler, Joshua C" sort="Fowler, Joshua C" uniqKey="Fowler J" first="Joshua C" last="Fowler">Joshua C. Fowler</name>
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<name sortKey="Miller, Tom E X" sort="Miller, Tom E X" uniqKey="Miller T" first="Tom E X" last="Miller">Tom E X. Miller</name>
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