期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 166, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2019.103816
关键词
Grain yield; Root length; Root density; Water use; Water stress; P deficiency
资金
- National Natural Science Foundation of China [31860115, 31700390, 31760133]
- Guizhou Science and Technology Support Program Project [Qiankehezhicheng (2019) 2399]
- Guizhou University Introduction of Talent Research Projects [guidarenjihezi (2017) 048]
- Key Laboratory of Soil Quality Safety and the Regulation of Water and Fertilizer of Guizhou Province [Qianjiaohe KY 2016(001)]
- Guizhou Provincial Biology First-Class Subject Construction Project [GNYL (2017) 009]
- project of State Key Laboratory of Grassland Agro-ecosystems [SKLGAE201703]
- Program Foundation of Institute for Scientific Research of Karst Area of NSFC-GZGOV [U1612442]
- Provincial Nation-class Discipline of Biology Foundation
- UWA Institute of Agriculture and School of Agriculture and Environment at the University of Western Australia
Combined water and phosphorus (P) deficits limit soybean yield. In a previous study, P application improved grain yield in soybean under drought, but how the P application improved grain yield under drought is not clear. Pot experiments were conducted to investigate why added P increases yield under water stress in two soybean genotypes with contrasting root traits and grain yield. Water and P deficits significantly reduced flower number and filled-pod number, and thus significantly reduced the grain number and grain yield, while P application significantly increased flower number, filled-pod number, grain number and grain yield under both well-watered (WW) and cyclic water stress (WS). P deficit significantly decreased daily water use during flowering [from 537 mL at 120 (P120) mg P kg(-1) dry soil to 343 mL with no added P (P0)] and podding (from 578 mL at P120 to 409 mL at PO), which was positively correlated with flower number, filled-pod numbers and total biomass at maturity in both the WW and WS treatments. For root traits, total root length and root surface area were significantly reduced under WS, while applied P increased root length and root surface area, but not lateral root density and adventitious root branch density. P application (P60 and P120) significantly increased root length and root surface area at flowering in the WW and WS treatments. Daily water use during flowering and podding was significantly positively correlated with root length and root surface area. We concluded that P application increased root growth and increased water use during flowering and podding, which had a positive effect on flower number filled-pod number, and grain yield.
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