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Increased carbon uptake under elevated CO2 concentration enhances water-use efficiency of C4 broomcorn millet under drought
Agricultural Water Management ( IF 6.7 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.agwat.2020.106631
Dongsheng Zhang , Ali Li , Shu Kee Lam , Ping Li , Yuzheng Zong , Zhiqiang Gao , Xingyu Hao

Abstract Broomcorn millet (Panicum miliaceum L.) has been cultivated in arid or semi-arid area due to its high drought tolerance. Yet information on how elevated atmospheric CO2 concentration ([CO2]) affects the responses to drought of the productivity, photosynthesis, water-use efficiency and drought tolerance of broomcorn millet is lacking. We investigated the effects of elevated [CO2] and drought on gas exchange parameters, water-use efficiency, physiological indices related to drought tolerance, leaf area and aboveground biomass of broomcorn millet using an open-top chamber experimental facility in North China in 2015 and 2016. Broomcorn millet was grown in pots with or without drought stress under ambient or elevated [CO2]. Elevated [CO2] could compensate the negative effect of drought on the leaf area and aboveground biomass of broomcorn millet. This was attributed to the direct stimulation in photosynthesis due to increased carbon uptake under elevated [CO2]. Elevated [CO2] significantly enhanced the water-use efficiency of broomcorn millet at both leaf and plant levels, especially under drought condition. Elevated [CO2] did not significantly affect evapotranspiration, but increased water-use efficiency at the plant level by 15% (2015) and 35% (2016) of broomcorn millet under drought. Elevated [CO2] did not significantly affect PSII efficiency, antioxidative defense capacity (peroxidase, malondialdehyde) or osmotic adjustment (soluble sugar content and proline). We conclude that elevated [CO2] -induced increase in carbon uptake and water-use efficiency would increase the productivity of broomcorn millet in semi-arid areas under future high-CO2 climate.

中文翻译:

在二氧化碳浓度升高的情况下增加碳吸收提高了干旱条件下 C4 黍的水分利用效率

摘要 黍(Panicum miliaceum L.) 具有较高的耐旱性,已在干旱或半干旱地区栽培。然而,关于大气 CO2 浓度 ([CO2]) 升高如何影响高粱小米的生产力、光合作用、水分利用效率和耐旱性对干旱的反应的信息尚缺乏。我们于 2015 年在华北地区使用开顶室实验设备研究了 [CO2] 升高和干旱对气体交换参数、水分利用效率、与耐旱性相关的生理指标、叶面积和地上生物量的影响,以及2016. 在环境或升高的 [CO2] 条件下,无论有无干旱胁迫,高粱小米都在盆中种植。升高的 [CO2] 可以补偿干旱对高粱谷子的叶面积和地上生物量的负面影响。这归因于在升高的 [CO2] 下增加碳吸收而直接刺激光合作用。升高的 [CO2] 显着提高了黍在叶子和植物水平上的水分利用效率,尤其是在干旱条件下。升高的 [CO2] 并未显着影响蒸发蒸腾作用,但在干旱条件下使高粱小米在植物层面的水分利用效率提高了 15%(2015 年)和 35%(2016 年)。[CO2] 升高不会显着影响 PSII 效率、抗氧化防御能力(​​过氧化物酶、丙二醛)或渗透调节(可溶性糖含量和脯氨酸)。
更新日期:2021-02-01
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