title: Effects of Soil Salinity on Sucrose Metabolism in Cotton Fiber.
abstract: Cotton (Gosspium hirsutum L.) is classified as a salt tolerant crop. However, its yield and fiber quality are negatively affected by soil salinity. Studies on the enzymatic differences in sucrose metabolism under different soil salinity levels are lacking. Therefore, field experiments, using two cotton cultivars, CCRI-79 (salt-tolerant) and Simian 3 (salt-sensitive), were conducted in 2013 and 2014 at three different salinity levels (1.15 dS m-1 [low soil salinity], 6.00 dS m-1 [medium soil salinity], and 11.46 dS m-1 [high soil salinity]). The objective was to elucidate the effects of soil salinity on sucrose content and the activity of key enzymes that are related to sucrose metabolism in cotton fiber. Results showed that as the soil salinity increased, cellulose content, sucrose content, and sucrose transformation rate declined; the decreases in cellulose content and sucrose transformation rate caused by the increase in soil salinity were more in Simian 3 than those in CCRI-79. With increase in soil salinity, activities of sucrose metabolism enzymes sucrose phophate synthase (SPS), acidic invertase, and alkaline invertase were decreased, whereas sucrose synthase (SuSy) activity increased. However, the changes displayed in the SuSy and SPS activities in response to increase in soil salinity were different and the differences were large between the two cotton cultivars. These results illustrated that suppressed cellulose synthesis and sucrose metabolism under high soil salinity were mainly due to the change in SPS, SuSy, and invertase activities, and the difference in cellulose synthesis and sucrose metabolism in fiber for the two cotton cultivars in response to soil salinity was determined mainly by both SuSy and SPS activities.
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.
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: 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: 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: Xinhua
authors.initials: X
authors.lastname: Zhao
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: 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: D032561:Cotton Fiber; D005964:Glucosyltransferases / Q000378:metabolism*; D003368:Gossypium / Q000378:metabolism*; D010940:Plant Proteins / Q000378:metabolism*; D054712:Salinity; D055049:Salt Tolerance / Q000502:physiology*; D013395:Sucrose / Q000378:metabolism*
chemical_list: D010940:Plant Proteins; D013395:Sucrose; D005964:Glucosyltransferases; C022699:sucrose synthase