Effects of Soil Salinity on Sucrose Metabolism in Cotton Leaves

• Published in: PloS one Vol. 11; no. 5; p. e0156241
• Main Authors: Peng, Jun, Liu, Jingran, Zhang, Lei, Luo, Junyu, Dong, Helin, Ma, Yan, Zhao, Xinhua, Chen, Binglin, Sui, Ning, Zhou, Zhiguo, Meng, Yali
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 26.05.2016; Public Library of Science (PLoS)
• Subjects: Agriculture; Analysis; Biology; Biology and Life Sciences; Carbohydrates; Carbon; Carbon dioxide; Carbon dioxide concentration; Causes of; Chlorophyll; Chlorophyll content; Complications and side effects; Cotton; Cotton (Plant); Cultivars; Ecology and Environmental Sciences; Environmental aspects; Enzymes; Gene expression; Glycine max; Gossypium - growth & development; Gossypium - metabolism; Gossypium hirsutum; Growth; Invertase; Irrigation; Laboratories; Leaves; Metabolism; Metabolites; Oryza; Oryza sativa; Osmotic potential; Photosynthesis; Physical Sciences; Physiological aspects; Physiology; Plant growth; Plant Leaves - growth & development; Plant Leaves - metabolism; Plant Proteins - metabolism; Plant Stems - growth & development; Plant Stems - metabolism; Rice; Salinity; Salinity effects; Salinity tolerance; Salt; Salt stress (Botany); Salt Tolerance - physiology; Seeds; Soil - chemistry; Soil investigations; Soil salinity; Soil stresses; Soils; Starch; Sucrose; Sucrose - metabolism; Sucrose phosphate synthase; Sucrose synthase; Sugar; Transformation; Weight reduction; China
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0156241

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.