title: Effects of Soil Salinity on Sucrose Metabolism in Cotton Leaves.
abstract: This study investigated sucrose metabolism of the youngest fully expanded main-stem leaf (MSL) and the subtending leaf of cotton (Gossypium hirsutum L.) boll (LSCB) of salt-tolerant (CCRI-79) and salt-sensitive (Simian 3) cultivars and its relationship to boll weight under low, medium and high soil salinity stress in Dafeng, China, in 2013 and 2014. The results showed that with increased soil salinity, 1) both the chlorophyll content and net photosynthetic rate (Pn) decreased, while the internal CO2 concentration firstly declined, and then increased in the MSL and LSCB; 2) carbohydrate contents in the MSL reduced significantly, while sucrose and starch contents in the LSCB increased, as did the activities of sucrose phosphate synthase (SPS) and sucrose synthase (SuSy) in both the MSL and LSCB; 3) but invertase activity in both the MSL and LSCB did not change significantly. Our study also showed that the LSCB was more sensitive to soil salinity than was the MSL. Of the measured physiological indices, higher SPS activity, mainly controlled by sps3, may contribute to adaption of the LSCB to soil salinity stress because SPS is beneficial for efficiently sucrose synthesis, reduction of cellular osmotic potential and combined actions of Pn, and sucrose transformation rate and SPS may contribute to the reduction in boll weight under soil salinity stress.
authors.affiliation: Key Laboratory of Crop Physiology & Ecology in Southern China, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China.|State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Peng
authors.affiliation: State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, China.|Institute of Integrative Plant Biology, School of Life Science, Jiangsu Normal University, Xuzhou, China.
authors.forename: Jingran
authors.initials: J
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, China.
authors.forename: Junyu
authors.initials: J
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, China.
authors.forename: Helin
authors.initials: H
authors.lastname: Dong
authors.affiliation: State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, China.
authors.forename: Xinhua
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Crop Physiology & Ecology in Southern China, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China.
authors.forename: Binglin
authors.initials: B
authors.lastname: Chen
authors.affiliation: Zhejiang Chinese Medical University, Hangzhou, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Sui
authors.affiliation: Key Laboratory of Crop Physiology & Ecology in Southern China, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China.
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Crop Physiology & Ecology in Southern China, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China.
authors.forename: Yali
authors.initials: Y
authors.lastname: Meng
mesh_terms: D003368:Gossypium / Q000254:growth & development / Q000378:metabolism*; D010788:Photosynthesis; D018515:Plant Leaves / Q000254:growth & development / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism; D018547:Plant Stems / Q000254:growth & development / Q000378:metabolism*; D054712:Salinity; D055049:Salt Tolerance / Q000502:physiology*; D012987:Soil / Q000737:chemistry*; D013395:Sucrose / Q000378:metabolism*
chemical_list: D010940:Plant Proteins; D012987:Soil; D013395:Sucrose