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>Photosynthetic response and nitrogen use efficiency of sugarcane under drought stress conditions with different nitrogen application levels
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Photosynthetic response and nitrogen use efficiency of sugarcane under drought stress conditions with different nitrogen application levels
Drought stress which often occurs during early growth stage is one constraint in sugarcane production. In this study, the response of sugarcane to drought and nitrogen application for physiological and agronomical characteristics was investigated. Two water regimes (well-watered and drought stress from 60 to 120?day after transplanting) and four nitrogen levels (0, 4.4, 8.8 and 13.2?g pot~(?1) equivalent to 0, 90, 180 and 270?kg?ha~(?1), respectively) were assigned in a Split-plot design with three replications. The results showed that photosynthetic responses to light intensity and intercellular CO_(2) concentrations of sugarcane were different between fertilized and non-fertilized treatments. Photosynthetic rates of 180 and 270?N treatments, normally, were significantly higher than that of 90?N, but not significant at drought conditions. Photosynthetic rates of 0?N treatment were the lowest under both conditions. Higher nitrogen application supported higher photosynthetic rate, stomatal conductance, and chlorophyll content because of higher nitrogen concentration accumulated into the leaf. Drought significantly reduced the potential photosynthetic rate, stomatal conductance, SPAD, leaf area, and biomass production. Higher nitrogen applications with larger root system could support higher photosynthetic activities to accumulate more dry mass. Strong positive coefficient between photosynthetic and biomass nitrogen use efficiency and drought tolerance index may suggest that higher nitrogen use efficiency could help plants have higher ability to tolerate drought stress.
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机译：干旱耐受性indexnitrogen使用efficiencyphotosynthesissugarcanewater stressCrop PhysiologyAphotosynthetic rateAmaxpotential光合rateCaambient CO2 CO2 concentrationCiintercellular后concentrationDATdays耐受transplantingDTIdrought indexgsstomatal conductanceISinitial A /次curveNLspecific叶片氮contentNUEnitrogen使用efficiencyPEPCasephosphoenolpyruvate carboxylasePFDphoton的斜率通量densityPNUEphotosynthetic氮利用efficiencyPWUEphotosynthetic用水efficiencyRubiscoribulose磷酸羧化酶加氧酶;
