| Interaction of phosphorus concentration and soil moisture on photosynthetic traits in soybean plants |
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| DOI：10.7606/j.issn.1000-7601.2010.05.27 |
| Key Words: soybean P nutrition drought stress photosynthesis |
| Author Name | Affiliation | | WANG Xuming | The Provincial Key Laboratory of the Resource Plant Biology in College of Life Sciences, Huaibei Normal University, Huaibei, Anhui 235000, China | | ZHANG Zheng | The Provincial Key Laboratory of the Resource Plant Biology in College of Life Sciences, Huaibei Normal University, Huaibei, Anhui 235000, China | | SHI Gangrong | The Provincial Key Laboratory of the Resource Plant Biology in College of Life Sciences, Huaibei Normal University, Huaibei, Anhui 235000, China |
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| Abstract: |
| The effects of phosphorus (P) nutrition and soil water availability (W) on the photosynthetic traits of soybean (Glycine max (L.) Merr.) plants were studied in pot experiments. Four levels of P supply (0.05, 0.5, 1.0 mmol/L and 2.0 mmol/L KH2PO4) were applied by nutrition solution. Before seedling establishment, the pots were kept near 100% of holding water capacity (HWC). Afterwards, the pots were maintained at 20%, 40%, 60%, and 80% HWC, respectively. The results were showed as follows: (1) Both the low P and drought stress resulted in a reduction of the leaf water content and shoot biomass, and an increase of the leaf water saturation deficit (WSD) and root/shoot ratio i
n soybean plants. There was a significant P×W interaction on WSD, root/shoot ratio, leaf water content, specific leaf area, and shoot biomass. (2) The chlorophyll contents(Chl a, Chl b and Chl a+b) were significantly decreased in s
eedlings under low P and/or drought stress, while chlorophyll a/b ratio was enhanced in P deficient plants, and it showed significant P×W interaction. (3) Drought stress and P deficient significantly reduced Fv/Fm and ΦPSⅡ, and a sig
nificant P×W interaction was observed on Fv/Fm. (4) Both the low P and drought stress caused a decrease in the net photosynthetic rate, intercellular CO2 concentration, stomatal conductance, and transpiration rate, but an increase in the stomatal limitation (Ls) in soybean plants. A significant P×W interaction was observed on the water use efficiency and Ls. |
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