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Effect of low sink demand on leaf photosynthesis under potassium deficiency

Yonghui PanTao RenZhifeng LuPiaopiao LuXiaokun LiRihuan CongJianwei Lu

College of Resources and Environment,Huazhong Agricultural UniversityKey Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River) Ministry of Agriculture

摘要:The role of sink demand in regulating leaf photosynthesis in response to potassium(K) deficiency was investigated in rapeseed(Brassica napus L).Plants was received with sufficient(+K) or free K supply(-K).The source/sink ratio in some plants of both treatments was increased by extracting all pods and flowers during full-bloom stage(sink removal treatment,SR),and the remaining plants were not removed(control treatment,CK).Carbohydrate content,photosynthetic properties and chloroplast ultrastructure were assessed in 3 weeks.During the early stage,leaf photosynthetic rate(Pn) declined significantly accompanied with a decrease of stomatal conductance(gs),intercellular CO2 concentrations(C1) and a profound accumulation of carbohydrates in SR.However,chlorophyll fluorescence parameters changed little.The decrement of Pn was larger in the-K treatment than that of +K treatment.What’s more,there was a negative relationship between potassium content and total non-structure carbohydrate content.Pn kept a decreasing pattern along with an increasing carbohydrate contents in the-K treatment,however,it didn’t decline until carbohydrate content reached a maximum in the+K treatment.However,longer sink removal duration resulted in a higher Pn compared with that of CK in both K levels.Overall,photosynthesis repression induced by sink removal was mainly caused by stoma closure,nevertheless it was not always happen ascribing to the development stage of leaf.Potassium starvation increased both carbohydrate level and leaf sensitivity to carbohydrate level and therefore accelerated photosynthesis repression.
会议名称:

第七届国际作物科学大会

会议时间:

2016-08-14

会议地点:

中国北京

  • 专辑:

    农业

  • 专题:

    农作物

  • 分类号:

    S565.4

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