title: Reduced abscisic acid content is responsible for enhanced sucrose accumulation by potassium nutrition in vegetable soybean seeds.
abstract: In order to understand the physiological mechanism of potassium (K) application in enhancing sugar content of vegetable soybean seeds, pot experiments were conducted in 2014 and 2015 with two vegetable soybean (Glycine max L. Merr.) cultivars (c.v. Zhongkemaodou 1 and c.v. 121) under normal rate of nitrogen and phosphorus application. Three potassium (K) fertilization treatments were imposed: No K application (K0), 120 kg K2SO4ha-1at seeding (K1), and 120 kg K2SO4ha-1at seedling + 1% K2SO4foliar application at flowering (K2). Contents of indole-3-acetic acid (IAA), gibberellins (GA), cytokinins (ZR) and abscisic acid (ABA) in seeds were determined from 4 to 8 weeks after flowering. K fertilization increased the contents of IAA, GA, ZR, soluble sugar, sucrose and fresh pod yield, but reduced ABA content consistently. When the contents of soluble sugar and sucrose reached the highest level at 7 weeks after flowering for the 2 cultivars, the contents of IAA、GA、ZR all reached the lowest level in general. The content of ABA in seed was negatively correlated with the sucrose content (P < 0.01, r = -0.749**, -0.768** in 2014 and -0.535**, -0.791** in 2015 for c.v.121 and c.v. Zhongkemaodou 1 respectively). The changes in ratio of the ABA to (IAA + GA + ZR) from 4 to 8 weeks after flowering affected by K application were coincident to the changes of sucrose accumulation. The reduced ratio of ABA/(IAA + GA + ZR) affected by K nutrition particularly reduced abscisic acid content plays a critical role in enhancing sucrose content, which might be a partial mechanism involved in K nutrition to improve the quality of vegetable soybean.
authors.affiliation: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Haping Road No. 138, Harbin, 150081, Heilongjiang, China.|College of Resources and Environment, Northeast Agricultural University, Harbin, 150030, China.
authors.forename: Bingjie
authors.initials: B
authors.lastname: Tu
authors.affiliation: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Haping Road No. 138, Harbin, 150081, Heilongjiang, China.
authors.forename: Changkai
authors.initials: C
authors.lastname: Liu
authors.affiliation: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Haping Road No. 138, Harbin, 150081, Heilongjiang, China.|College of Resources and Environment, Northeast Agricultural University, Harbin, 150030, China.
authors.forename: Bowen
authors.initials: B
authors.lastname: Tian
authors.affiliation: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Haping Road No. 138, Harbin, 150081, Heilongjiang, China. zhangqiuying@iga.ac.cn.
authors.forename: Qiuying
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Haping Road No. 138, Harbin, 150081, Heilongjiang, China.|College of Resources and Environment, Northeast Agricultural University, Harbin, 150030, China.
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Liu
authors.affiliation: Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, USA.
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Herbert
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism*; D003583:Cytokinins / Q000378:metabolism; D005308:Fertilizers; D035264:Flowers / Q000378:metabolism; D005875:Gibberellins / Q000378:metabolism; D007210:Indoleacetic Acids / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism; D010937:Plant Growth Regulators; D011188:Potassium / Q000378:metabolism* / Q000494:pharmacology*; D036226:Seedlings; D012639:Seeds / Q000737:chemistry* / Q000187:drug effects / Q000378:metabolism*; D013025:Glycine max / Q000187:drug effects / Q000378:metabolism*; D013395:Sucrose / Q000378:metabolism*; D013997:Time Factors; D014675:Vegetables / Q000378:metabolism
chemical_list: D003583:Cytokinins; D005308:Fertilizers; D005875:Gibberellins; D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; D013395:Sucrose; C030737:indoleacetic acid; D000040:Abscisic Acid; D009584:Nitrogen; D011188:Potassium
keywords: Phytohormones; Potassium fertilization; Sucrose; Vegetable soybean