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园艺学报 ›› 2003, Vol. 30 ›› Issue (02): 141-146.

• 研究论文 • 上一篇    下一篇

水杨酸诱导提高香蕉幼苗耐寒性的机制研究

康国章1; 欧志英1; 王正询2*; 孙谷畴1
  

  1. (1中国科学院华南植物研究所,广州510650;2广州大学生物系,广州510405)
  • 收稿日期:2002-09-11 修回日期:2002-12-11 出版日期:2003-04-25 发布日期:2003-04-25

Salicylic Acid Alleviated the Damage Caused by Low Temperature to Cell Merebrane and Some Photosynthetic Functions of Banana SeeaUngs

Kang Guozhangt1;Ou Zhiyingt1;Wang Zhengxun2; Sun Guchou1)
  

  1. ( 1South China Institute of Botany,the Chinese Academy of Sciences, Guangzhou 510650,China;2Deparmant of Biology,Guangzhou University,Guangzhou 510405,China)
  • Received:2002-09-11 Revised:2002-12-11 Online:2003-04-25 Published:2003-04-25

摘要: 摘要:香蕉幼苗经水杨酸(Salicyhc acid,SA)常温(22/15℃)预处理(0.3—0.9 mmol·L-1 )1 d可显著降低7℃低温胁迫造成的膜内电解质泄漏,减少5~C低温引起的萎蔫面积,提高抗寒性。低浓度sA预处理(≤0.1 mmol·L-1 )降低电解质泄漏效果不明显,而高浓度sA(I>2.5 mmol·L-1 )则增加了电解质泄漏,加剧了低温伤害。0.5 mmol·L-1 SA常温处理1 d对叶绿素荧光参数(Fv/Flm、Fv’/Fm’、qe、 PSⅡ等)和光合速率(Pn)产生抑制,但效果未达到显著水平;SA预处理可明显减缓低温胁迫期间Fv/Fm、Fv’/Fm’、qP、西eSlI和Pn的下降程度,抑制F0及NPQ快速上升,加快这些参数在恢复期间(22/15℃)的恢复程度,表明sA预处理在低温胁迫期间对香蕉幼苗的细胞膜和一些光合功能提供了保护作用。

关键词: 香蕉, 水杨酸, 低温, 电解质泄漏, 光合功能

Abstract: The possible physiological mechanism of enhancement of cold tolerance by salicylic acid(SA)in banana seedlings(Musa A L.CV.Williams 8188)was explored.1 d of 0.3—0.9 mmol·L-1 SA treatment at 22/15 ℃ by spayed to leaves and irrigated to roots of banana seedlings)significantly enhanced chilhng-resistance of banana seedlings during subsequent 7 ℃ or 5 ℃ low temperature stress, indicated by the reduction of electrolyte leakage or wilting aIea,respectively.Under normal growth condition(22/15 ℃),1 d of0.5 mmol·L-1 treatment eaused a slight decrease of Fv/Fm,Fv’/Fm’,qP,卯S1I and Pn.However,SA pretreatment markedly inhibited the reduction of Fv/Fm, Fv’/Fm’,qP,卯SⅡ and Pn,and alleviated the rapid increase of Fo and NPQ during 3 d of 7 ℃ low temperature.And during 2 d of recovery periods(22/15%:),SA pretreattment also accelerated the recovery of these photosynthetic parameters above.Th e results indicated that SA pretreatment could provide a protection for the cell membranes and the photosynthetic functions of the cold-stIIessed banana see(uirlgs, which could help to enhance thechiling tolerance of banana plants.

Key words: Banana, Salicylic acid, Low temperature, Electrolyte leakage, Photosynthetic functions

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