摘要
为了探明缺钾对茶树叶片的光合电子传递、光能转化和利用等的影响机制,本研究以10月龄扦插"瑞香"茶[Camellia sinensis(L.)O. Kuntze cv. Ruixiang]苗为试验材料,通过沙培试验,用含5个不同钾浓度(K 0、100、200、600、2000μmol/L)的营养液浇灌,每周3次,处理24周后,进行茶树叶片叶绿素荧光参数的测定。结果表明,缺钾处理茶树叶片OJIP曲线O点上升,P点下降,同时出现150μs处的L点和300μs处的K点两个新点;缺钾条件下,TRo/ABS(或Fv/Fm)(最大光化学效率)、ETo/ABS(电子传递的量子产额)、REo/ABS(还原量子效率)、PⅠabs(吸收光能的性能指数)和PⅠCS(单位面积为基础的性能指数)下降,而VJ、VI和耗散能增加。总之,缺钾损伤了从PSⅡ供体侧到PSⅠ的整个电子传递链,降低了光合电子传递能力;缺钾叶片还通过增加热耗散以保护叶片在强光下免遭光氧化伤害。
The objective was to determine the mechanism of the alteration of photosynthetic electron transport,light energy transformation and utilization of tea tree leaves under K deficiency. Vegetative propagated 10-month-old tea [Camellia sinensis（L.） O. Kuntze cv. Ruixiang] seedlings grown in pots were fertilized three times weekly for 24 weeks with different nutrient solution contents,0,100,200,600 and 2000 μmol/L potassium.The results show that OJIP transients from the K-deficiency leaves display the decreased P-step and the increased O-step,and as well as two new steps at about 150 μs（L-step） and 300 μs（K-step） in the different spectra compared with the control.The RC/CSo,TRo/ABS（or Fv/Fm）,ETo/ABS,REo/ABS,PⅠabs and PⅠcs are decreased in the K-deficiency leaves,while VJ,VI and dissipated energy are increased.In conclusion,The K deficiency decreases photosynthetic electron transport capacity by impairing the whole electron transport chain from PSⅡ donor side up to the PSⅠ.Enhanced energy dissipation protects the leaves of K-deficiency plants from photo-oxidative damage in high light.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2012年第4期974-980,共7页
Journal of Plant Nutrition and Fertilizers
基金
国家茶叶产业技术体系项目(nycytx-23)
福建省农科院科技创新团队重点项目(CXTD2011-18)
福建省自然科学基金项目(2009J01083)
福建公益科研院所专项(2010R1014-3)资助
关键词
缺钾
茶树
叶绿素荧光
光系统
K deficiency； tea plant； chlorophyll fluorescence； photosystem
