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IMPROVED NUTRIENT UPTAKE ENHANCES COTTON GROWTH AND SALINITY TOLERANCE IN SALINE MEDIA

文献类型： 外文期刊

作者： Dai, J. L. 1 ; Duan, L. S. 1 ; Dong, H. Z. 1 ;

作者机构： 1.Shandong Acad Agr Sci, Cotton Res Ctr, Key Lab Cotton Culture & Physiol Shandong Prov, Jinan 250100, Shandong, 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;nutrient uptake;salinity stress;salt tolerance;split-root

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： 2014 年 37 卷 8 期

页码：

收录情况： SCI

摘要： Two experiments were conducted to determine if improved nutrient uptake increases salinity tolerance of cotton (Gossypium hirsutum L.). A transgenic cotton line (CMO3) with increased salt tolerance and its wild line (SM3) were grown in pots containing substrate (peat: vermiculite = 1: 1, v/v) in the first experiment, while cotton ('SCRC 28') was cultured in hydroponics with a split-root system in the second experiment. Contents of essential nutrient elements and Na+ in plant tissues, leaf photosynthesis (Pn) and chlorophyll (Chl) concentration and plant biomass were determined after salinity [sodium chloride (NaCl)] treatment in both experiments. In the first experiment, salinity stress with 150 mM NaCl reduced plant biomass and photosynthesis (Pn) of both SM3 and CMO3 compared with their non-stressed controls, but the CMO3 suffered significantly lower reductions than SM3, suggesting an increased salinity tolerance of CMO3 relative to SM3. Total uptake and contents of main nutrient elements [nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), manganese (Mn), copper (Cu), and zinc (Zn)] in CMO3 were higher than those in SM3. Also, less sodium (Na+) accumulation and lower extreme ratios of Na/N, Na/P, Na/K, Na/Ca, Na/Mg, Na/Fe, Na/Mn, Na/Cu, and Na/Zn were observed in CMO3 than in SM3. Increased salt tolerance in transgenic AhCMO cotton was probably attributed to its superior nutrient uptake compared with SM3. In the second experiment, the non-stressed root half fed with moderate level of nutrient solution and salt-stressed half fed with low level of nutrient solution (CMN/SLN) exhibited higher salinity tolerance than salt-stressed root half fed with moderate level of nutrient solution and non-stressed root half fed with low nutrient solution (CLN/SMN). Plants absorbed more nutrients but less Na+ under CMN/SLN than CLN/SMN. The overall results suggest that improved nutrient uptake played an important role in the enhanced salt tolerance of cotton.

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