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Title:: Effects of Soil Salinity on the Growth and Photosynthesis of Soybean under Drought Conditions

Author(s):: LIU Sha-sha; BAI Xin-fu; FENG Chun-xiao; SUN Yan-lin; (School of Life Sciences, Ludong University, Yantai 264025, China)

Keywords:: Combined stresses of drought and salinity; Drought; Photosynthesis; Growth; Soybean

PACS:: -

DOI:: 10.11861/j.issn.1000-9841.2017.06.0921

Abstract:: The impact of soil salinity on the growth of soybean plants and the possible mechanisms in association with the impact was investigated. The investigation involved the measurement of effects of combined drought and salinity stresses on the soybean seedlings. The growth and photosynthetic rate, chlorophyll fluorescence parameters, water status and the K⁺and Na⁺content in the stressed soybean seedlings.The results showed that, under drought or salt stress, the growth of the seedlings was significantly inhibited, leaf net photosynthesis reduced, resulting in serious injury in the photosynthetic apparatus.However, the parameters like the net photosynthetic rate, maximum quantum efficiency of PhotosystemⅡ and biomass were significantly higher in seedlings subjected to combined stresses of drought and moderate soil salinity than to single drought stress. In addition, the relative water and content and Na⁺content was also significantly higher, but the water and osmotic potentials of the plants subjected to combined stresses of drought and moderate soil salinity than to single drought stress, with the decline of the tissue osmotic potential being closely correlated to the Na⁺content.This may suggest that under drought conditions, moderate salt stress in the soil could force the soybean seedlings to absorb and accumulate more Na⁺ions as osmolytes, so that the tissue osmotic potential being reduced and suction force for water absorption in plants being enhanced, which was conducive to soybean plants maintain higher water content, maintain a relatively higher rate of photosynthesis and growth.In other words, the presence of moderate NaCl in soil might effectively mitigate the negative effects of drought on the growth of soybean.

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Effects of Soil Salinity on the Growth and Photosynthesis of Soybean under Drought Conditions(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

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