Gao, Yingxu and Li, Yong and Yang, Xiuxia and Li, Haijun and Shen, Qirong and Guo, Shiwei (2010) Ammonium nutrition increases water absorption in rice seedlings (Oryza sativa L.) under water stress. Plant and Soil , 331 (1-2). pp. 193-201.
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Abstract
Water stress is a primary limitation on plant growth. In previous studies, it has been found that ammonium enhances the tolerance of rice plants to water stress, but how water is related to nitrogen form and water stress remains unknown. To study the effects of nitrogen form (NH4 +, NO3 −, and a mixture of NH4 + and NO3 −) on the growth and water absorption of rice (Oryza sativa L.) seedlings, a hydroponic experiment with water stress, simulated by the addition of polyethylene glycol (PEG, 10% w/v, MW 6000), was conducted in a greenhouse. The results showed that, compared with non-water stress, under water stress, the fresh weight of rice seedlings increased by 14% with NH4 + nutrition, whereas it had decreased by about 20% with either NO3 − or mixed nitrogen nutrition. No significant difference was found in the transpiration rate of excised shoots or in xylem exudation of excised roots in NH4 + supply between the two water situations, whereas xylem flow decreased by 57% and 24% under water stress in NO3 − and mixed nutrition, and root hydraulic conductivity decreased by 29% and 54% in plants in NH4 + and NO3 − nutrition conditions, respectively. Although water absorption ability decreased in both NH4 + and NO3 − nutrition, aquaporin activity was higher in NH4 + than in NO3 − nutrition, regardless of water stress. We conclude that NH4 + nutrition can improve water handling in rice seedlings and subsequently enhance their resistance to drought.
| Item Type: | Article |
|---|---|
| Author Affiliation: | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China |
| Subjects: | Crop Improvement > Seed Technology Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Other Crops |
| Depositing User: | David T |
| Date Deposited: | 18 Nov 2010 16:08 |
| Last Modified: | 29 Dec 2010 20:26 |
| Official URL: | http://DOI 10.1007/s11104-009-0245-1 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/674 |
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