title: [Effects of potassium fertilization period on photosynthetic characteristics and storage root starch accumulation of edible sweetpotato].
abstract: Abstract: In this study, same amount of potassium (240 kg . hm-2) was applied as basal dressing (treatment 1) and as 1/2 basal dressing + 1/2 top-dressing at day 75 after planting (treatment 2), aimed to investigate the effects of potassium fertilization period on the photosynthetic characteristics of edible sweetpotato and the starch accumulation in storage root. As compared with treatment 1, treatment 2 improved the leaf photosynthetic rate and sucrose-phosphate synthase activity and the storage root's adenosine diphosphate glucose pyrophosphortlase activity, enhanced the starch accumulation rate in storage root (with an average increment of 6. 7%), and increased the root tuber yield significantly by 8. 2%. Both of the potassium fertilization treatments improved the synthesis of sucrose in leaf and the transformation from sucrose to starch in storage root, as compared with no potassium fertilization.
authors.affiliation: Key Laboratory of Sweetpotato Biology and Genetic Breeding, Sweetpotato Research Institute, Chinese Academy of Agricultural Sciences, Xuzhou 221131, Jiangsu, China. chenxggw@163.com
authors.forename: Xiao-Guang
authors.initials: XG
authors.lastname: Chen
authors.forename: Chun-Yu
authors.initials: CY
authors.lastname: Shi
authors.forename: Hong-Min
authors.initials: HM
authors.lastname: Li
authors.forename: Ai-Jun
authors.initials: AJ
authors.lastname: Zhang
authors.forename: Xin-Min
authors.initials: XM
authors.lastname: Shi
authors.forename: Zhong-Hou
authors.initials: ZH
authors.lastname: Tang
authors.forename: Meng
authors.initials: M
authors.lastname: Wei
mesh_terms: D018533:Biomass; D005308:Fertilizers; D027723:Ipomoea batatas / Q000254:growth & development* / Q000502:physiology; D010788:Photosynthesis / Q000502:physiology*; D018517:Plant Roots / Q000254:growth & development* / Q000378:metabolism; D011188:Potassium / Q000737:chemistry*; D013213:Starch / Q000378:metabolism*
chemical_list: D005308:Fertilizers; D013213:Starch; D011188:Potassium