Effects of elevated CO2 on the growth, seed yield, and water use efficiency of soybean (Glycine max (L.) Merr.) under drought stress
Effects of elevated CO2 on the growth, seed yield, and water use efficiency of soybean (Glycine max (L.) Merr.) under drought stress
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干旱胁迫下 CO2 升高对大豆 (Glycine max (L.) Merr.) 生长、种子产量和水分利用效率的影响
DOI：
10.1016/j.agwat.2013.07.014
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发表时间：
2013-11-01
影响因子：
6.7
通讯作者：
Liu, Mengyu
中科院分区：
文献类型：
--
作者：
Li, Dongxiao;Liu, Huiling;Liu, Mengyu
本研究旨在评价黄淮海平原缺水地区CO2浓度升高对大豆生长的影响。在封闭的顶室中进行了涉及两种CO2浓度（环境，380.1 +/- 32.2 μ mol mol（-1）和升高的，740.6 +/- 45.4 μ mol mol（-1））和两种水位（正常和干旱）的盆栽实验。结果表明，在正常水分和EC条件下，鼓粒期的株高、叶面积和地上部干重分别比对照增加25.4%、15.8%和33.4%。单株种子产量也提高了25.3%。在干旱条件下，EC对株高、叶面积和种子产量的影响不显著。但在灌浆期，地上部干重增加了56%。这种增加是由于更高的生物量分配向茎。在正常水分条件下，鼓粒期EC中的光合速率（Pn）比大气CO2（AC）中高21.7-43.3%。在干旱条件下。EC处理使Pn保持较高水平，但蒸腾速率（Tr）降低。此外，在正常水分条件下，水稻灌浆期产量和生物量的水分利用效率（WUE产量和WUE生物量）分别提高了26.2%和55.4%。而在干旱条件下，它们仅分别增加了5.9%和13.4%。这些结果表明，EC在正常水分条件下比在干旱胁迫条件下更有效地促进大豆的生长和WUE。总之，EC并没有缓解干旱对大豆种子产量的抑制，但它提高了Pn和WUE。大豆应在良好的灌溉制度下或在降水充足的地区种植，以适应和充分利用EC。(C)2013爱思唯尔有限公司版权所有。
This study aims to evaluate the effects of elevated carbon dioxide (EC) on soybean growth in the water-deficient region of Huang-Huai-Hai Plain, China. A pot experiment involving two CO2 concentrations (ambient, 380.1 +/- 32.2 mu mol mol(-1) and elevated, 740.6 +/- 45.4 mu mol mol(-1)) and two water levels (normal and drought) were conducted in enclosed top chambers. The results showed that plant height, leaf area, and shoot dry weight were increased by 25.4%, 15.8%, and 33.4% under normal water and EC conditions, respectively, at the seed-filling stage. Seed yield per plant was also improved by 25.3%. Under drought conditions, EC did not show a significant effect on plant height, leaf area, and seed yield. However, shoot dry weight was increased by 56% at the seed-filling stage. This increase was due to the higher biomass allocation toward the stems. Under normal water conditions, the photosynthetic rate (Pn) was higher (21.7-43.3%) in EC than in ambient carbon dioxide (AC) at the seed-filling stage. Under drought conditions. Pn remained high, but the transpiration rate (Tr) was reduced by EC. In addition, the water use efficiency at yield and biomass levels (WUEyield and WUEbiomass) were increased by 26.2% and 55.4% under normal ss, water conditions in EC at the seed-filling stage. However, they were only increased by 5.9% and 13.4%, respectively, under drought conditions. These results suggested that EC improved the growth and WUE of soybean more effectively under normal water conditions than under drought stress conditions. In conclusion, EC did not mitigate drought-induced inhibition of seed yield in soybean, although it increased Pn and WUE. Soybean should be cropped under well irrigation regimes or at regions with sufficient precipitation to adapt and take full advantage of EC. (C) 2013 Elsevier B.V. All rights reserved.