<FONT face="Verdana">Effects of Different Nitrogen Forms and Water Stress on the Growth and Osmotic Adjustment of Rice Seedlings </FONT>

LI  Hai-jun,LI  Yong,YANG Xiu-xia,SHEN  Qi-rong,GUO Shi-wei*

doi:10.3969/j.issn.1001-7216.2010.04.012

Chinese Journal OF Rice Science >

2010 , Vol. 24 >Issue 4: 403 - 409

DOI: https://doi.org/10.3969/j.issn.1001-7216.2010.04.012

研究报告

Effects of Different Nitrogen Forms and Water Stress on the Growth and Osmotic Adjustment of Rice Seedlings

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College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China; *Corresponding author, E-mail: sguo@njau.edu.cn

Received date: 1900-01-01

Revised date: 1900-01-01

Online published: 2010-07-10

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Abstract

The responses of indica and japonica rice seedlings to water stress were studied by supplying with different nitrogen forms under 100 g/L PEG6000 simulated water stress. The results showed that compared with ammonium nutrition, water stress significantly decreased shoot growth and photosynthesis of nitrate supplied indica and japonica rice seedlings with a more severe inhibition on japonica rice seedlings; under water stress, ammonium supplied rice plants could sufficiently accumulate and transfer amino acids and potassium, which led to relative higher amino acids and potassium contents in xylem and phloem sap; when leaf water potential decreased under water stress, ammonium supplied rice plants could enhance or maintain relative higher leaf water content through osmotic regulation. Therefore, when leaf water potential was decreased under water stress, the maintenance of leaf water content in ammonium supplied rice plants ensured relative higher photosynthesis, which subsequently enhanced the tolerance of rice plants to water stress.

Key words： nitrogen form; water stress; amino acid; potassium ion; leaf osmotic potential; drought tolerance; rice

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LI Hai-jun,LI Yong,YANG Xiu-xia,SHEN Qi-rong,GUO Shi-wei* . Effects of Different Nitrogen Forms and Water Stress on the Growth and Osmotic Adjustment of Rice Seedlings [J]. Chinese Journal OF Rice Science, 2010 , 24(4) : 403 -409 . DOI: 10.3969/j.issn.1001-7216.2010.04.012

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