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林业科学 ›› 2001, Vol. 37 ›› Issue (5): 35-40.doi: 10.11707/j.1001-7488.20010507

• 论文及研究报告 • 上一篇    下一篇

干旱对沙棘休眠、萌芽期内源激素及萌芽特性的影响

李丽霞 梁宗锁 韩蕊莲   

  1. 中国科学院水利部水土保持研究所,杨凌712100
  • 收稿日期:2000-08-08 修回日期:1900-01-01 出版日期:2001-09-25 发布日期:2001-09-25

EFFECT OF SOIL DROUGHT ON ENDOGENOUS HORMONE AND SPROUT CHARACTER IN DORMANCY AND SPROUT PERIOD OF SEABUCKTHORN SEEDLINGS

Li Lixia,Liang Zongsuo,Han Ruilian   

  1. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources Yangling 712100
  • Received:2000-08-08 Revised:1900-01-01 Online:2001-09-25 Published:2001-09-25

摘要:

以2a生中国沙棘为试验材料,研究了土壤干旱胁迫下沙棘苗木水分生理状况,内源GA1/3 及ABA水平与萌芽率的关系,结果表明:土壤干旱胁迫导致苗体含水量、水势、自由水含量下降,显著提高冬季休眠与春季萌动期的内源ABA水平而降低内源GA1/3 含量,GA1/3/ABA降低,较晚达到萌动所需的调控阈值,萌芽延迟。重度胁迫下苗木延迟达25d且萌芽后生长缓慢。长期土壤中度干旱条件下沙棘苗萌芽期亦略有延迟,萌芽后生长略有抑制。

关键词: 土壤干旱, 内源激素, 休眠期, 萌芽期, 沙棘

Abstract:

Relationship between water status, endogenous hormone and sprout rate of 2 years old China seabuchthorn under water deficit was analyzed. The main results are: water deficit made water content, free water, water potential and endogenous GA1/3 of seabuckthorn seedlings decreased, while endogenous ABA level increased obviously during dormancy stage in winter and sprout period in spring, so ratio of GA1/3/ABA droped and came to threshold value later. As a result, the germination day delayed, especially that of seedlings under serious water deficit was postponed even for 25 days. Besides, seedlings grew slowly after sprout. Seabuckthorn suffered slight injure from a long time of medium soil water stress and sprout date was also delayed a few days and growth after sprout was restrained to a small extent.

Key words: Soil drought, Endogenous hormone, Dormancy stage, Sprout period, Seabuckthorn