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COMPARATIVE EFFECT OF NITROGEN FORMS ON NITROGEN UPTAKE AND COTTON GROWTH UNDER SALINITY STRESS

文献类型： 外文期刊

作者： Dai, Jianlong 1 ; Duan, Liusheng 2 ; Dong, Hezhong 1 ;

作者机构： 1.Shandong Acad Agr Sci, Key Lab Cotton Culture & Physiol Shandong Prov, Cotton Res Ctr, Jinan 250100, Peoples R China

2.China Agr Univ, Coll Agron & Biotechnol, State Key Lab Plant Physiol & Biochem, Beijing 100094, Peoples R China

关键词： cotton; nitrogen forms; nitrogen uptake; salinity

期刊名称：JOURNAL OF PLANT NUTRITION （ 影响因子：1.707； 五年影响因子：1.645 ）

ISSN： 0190-4167

年卷期： 2015 年 38 卷 10 期

页码：

收录情况： SCI

摘要： The effects of nitrogen (N) forms (ammonium- or nitrate-N) on plant growth under salinity stress [150mmol sodium chloride (NaCl)] were studied in hydroponically cultured cotton. Net fluxes of sodium (Na+), ammonium (NH4+), and nitrate (NO3-) were also determined using the Non-Invasive Micro-Test Technology. Plant growth was impaired under salinity stress, but nitrate-fed plants were less sensitive to salinity than ammonium-fed plants due mainly to superior root growth by the nitrate-fed plants. The root length, root surface area, root volume, and root viability of seedlings treated with NO3-N were greater than those treated with NH4-N with or without salinity stress. Under salinity stress, the Na+ content of seedlings treated with NO3-N was lower than that in seedlings treated with NH4-N owing to higher root Na+ efflux. A lower net NO3- efflux was observed in roots of nitrate-fed plants relative to the net NH4+ efflux from roots of ammonium-fed plants. This resulted in much more nitrogen accumulation in different tissues, especially in leaves, thereby enhancing photosynthesis in nitrate-fed plants under salinity stress. Nitrate-N is superior to ammonium-N based on nitrogen uptake and cotton growth under salinity stress.

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