Leaf nitrogen have a better relationship with photosynthesis performance across wheat species under elevated CO2 and drought

Elevated CO2 concentrations and persistent drought are predicted to inhibit the photosynthetic performance and yield of crops. Such effects vary considerably between species groups. Modern cultivated (Triticum aestivum L., AABBDD) and wild (Triticum dicoccoides Korn L., AABB and Triticum monococcum...

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Veröffentlicht in:Plant physiology and biochemistry 2021-09, Vol.166, p.964-973
Hauptverfasser: Yu-zheng, Zong, Han-qing, Zhang, Ping, Li, Dong-sheng, Zhang, Xing-yu, Hao, Zhi-qiang, Gao
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container_title Plant physiology and biochemistry
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Han-qing, Zhang
Ping, Li
Dong-sheng, Zhang
Xing-yu, Hao
Zhi-qiang, Gao
description Elevated CO2 concentrations and persistent drought are predicted to inhibit the photosynthetic performance and yield of crops. Such effects vary considerably between species groups. Modern cultivated (Triticum aestivum L., AABBDD) and wild (Triticum dicoccoides Korn L., AABB and Triticum monococcum L., AA) species of wheat were subjected to elevated CO2 concentration (ambient concentration +200 μmol mol−1) and drought (well watered: 75–85% of the field water capacity; drought: 50–60% of the field water capacity) at open-top chamber experimental facilities. Elevated CO2 concentration decreased the limitation of stomatal morphology traits on stomatal conductance regulation. This could compensate the disadvantage of plants who has low stomatal density and large single stomatal area as well as low leaf water use efficiency such as modern wheat Z9023 in drought acclimation in the future CO2 rising world. Moreover, elevated CO2 concentration largely increased the dependence of light harvesting and electron transportation performance per photosynthesis system II reaction center, maximum rubisco carboxylation rate, and maximum Ribulose-1,5-bisphosphate regeneration rate on leaf nitrogen concentration across the selected wheat species and water regimes. Modern cultivated cultivars Z9023 and CH58 have higher photosynthetic performance per unit of leaf nitrogen than wild species under elevated CO2 concentrations. The increasing CO2 may present opportunities to breeders and possibly allow them to select for cultivars with better photosynthetic nitrogen use efficiency response to future CO2 rising climate. •Elevated [CO2] (eCO2) decreased the limitation of stomatal morphology traits on stomatal conductance of wheat.•The reasons of photosynthesis depend on nitrogen were observed under eCO2.•Nitrogen use in photosynthesis in modern wheat was higher than that in wild wheat under eCO2.•Selection for higher capacity of nitrogen use might be more important than selection for a higher WUE under eCO2.
doi_str_mv 10.1016/j.plaphy.2021.07.002
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subjects Drought
Elevated CO2 concentration
Nitrogen use
Water use efficiency
Wheat
title Leaf nitrogen have a better relationship with photosynthesis performance across wheat species under elevated CO2 and drought
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