光合作用
蔗糖
蔗糖合成酶
蔗糖磷酸合酶
化学
盐度
糖
碳水化合物
钾
叶绿素
农学
碳水化合物代谢
果糖
园艺
转化酶
生物
食品科学
生物化学
有机化学
生态学
作者
Feiyan Ju,Jiali Pang,Yuyang Huo,Junjun Zhu,Kai Yu,Liyuan Sun,Dimitra A. Loka,Wei Hu,Zhiguo Zhou,Shanshan Wang,Binglin Chen,Qiuxiang Tang
标识
DOI:10.1016/j.fcr.2021.108288
摘要
Field experiments were conducted in 2017 and 2018, in order to investigate the effects of potassium (K) application on photosynthetic capacity and carbohydrate metabolism of the leaf subtending the cotton boll (LSCB) under salt stress. Three salinity treatments (EC = 1.68∼1.78, 6.21∼6.42 and 10.59∼11.08 dS m−1) with three K levels (0, 150, 300 kg K2O ha-1) applied in each salinity treatment, were imposed on two cotton (Gossypium hirsutum L.) cultivars differing in salt sensitivity (CCRI-79, salt tolerant and Simian 3, salt sensitive). The results indicated that under salt stress: (1) K application increased LSCB K+/Na+ ratio since Na+ concentration decreased and K+ concentration increased. Cotton boll (capsule wall, seed and lint) biomass, total boll number, boll weight and seed cotton yield were also increased; (2) K application improved net photosynthetic rates (Pn) of LSCB by increasing stomatal conductance rates (Gs), chlorophyll a and b concentrations and chlorophyll a/b ratio; (3) K application decreased soluble sugar, sucrose and starch concentrations of LSCB through increases in sucrose phosphate synthase (SPS) and sucrose synthase (SuSy) activities and decreases in sucrose acid invertase (SAI) activity. The results of this study indicated that K fertilizer application rates have a regulating effect on LSCB’s photosynthetic properties and carbohydrate metabolism under salt stress, thus providing a theoretical foundation for increasing cotton yield under salt stress.
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