| Effects of different NH+4/NO-3 on photosynthetic characteristics and chlorophyll fluorescence parameters in the cotton seedlings under low temperature stress |
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| DOI：10.7606/j.issn.1000-7601.2018.05.06 |
| Key Words: cotton seedling NH+4/NO-3 low temperature stress photosynthetic characteristics |
| Author Name | Affiliation | | ZHANG Shu-ying | College of Agronomy , Shihezi University , Shihezi, Xinjiang 832000, China | | CHU Gui-xin | College of Agronomy , Shihezi University , Shihezi, Xinjiang 832000, China | | LIANG Yong-chao | College of Agronomy , Shihezi University , Shihezi, Xinjiang 832000, China
College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China |
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| Abstract: |
| The internal mechansim of enhanced effect by ammonium( NH+4 ) on cotton increasing the stress tolerance of Xinjiang’s cotton was investigated to better understand how to improve the cold resistance of cotton seedling. Effects of various form nitrogen on low temperature stress of Cotton-Xinluzao13 and its photosynthetic characteristics were explored by the method of manually simulate the environment under low temperature in the artificial climate chamber. The results indicated that the chlorophyll concentration of mixed nitrogen nutrition was higher than both NH+4/ NO-3 as 100/0 and NH+4/ NO-3 as 0/100 especially the NH+4/NO-3 as 0/100 (P<0.05) under two culturing temperature gradients. Chlorophyll concentration of cotton seedlings was lower significantly (P<0.05) under low temperature (15℃) than that under normal temperature (25℃). The Pn, Gs, Tr, ETR, Yield, qP and qN of cotton seedlings also decreased signicantly (P<0.05) under low temperature. The Pn, Gs, Tr of cotton seedlings increased significantly (P<0.05) or extreme significantly (P<0.01) with ammonium (NH+4) ratio increasement and reached the maximum in NH+4/ NO-3 as 100/0 under normal temperature. The ETR, Yield, qP and qN of cotton seedlings increased first and then decreased under low temperature. Enhancing the ammonium (NH+4) promoted the chlorophyll concentration, the photosynthetic indexes of Pn, Gs, Tr and fluorescence parameters of ETR, Yield, qP, qN of cotton seedlings, kept the balance of mtabolism and relieved the harm of low temperature stress and strengthens the cold resistance of cotton seedling. |
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