摘要
研究了干旱胁迫下沙棘幼林苗木渗透调节能力与沙棘耐旱性的关系。结果表明:长期轻度及中度干旱胁迫下渗透调节物质中可溶性糖、游离氨基酸、Pro在干旱中、后期累积显著增加而降低渗透势,使沙棘具备较强的渗透调节能力而表现为低水势耐旱特性;K+在干旱下无显著累积。渗透调节物质(可溶性糖、游离氨基酸、Pro)的共同作用,使长期轻度、中度干旱下沙棘叶片可溶性蛋白降解少,细胞膜透性和MDA含量增加缓慢,重度干旱下也能在一定时间内保持稳定,这些物质是构成沙棘强耐旱性的内在基础。
The relation between the soluble sugars and drought tolerance was researched.Increase of Proline can alleviate osmotic potential,which proved that seabuckthorn had characteristics of drought tolerance at low water potential.Owing to osmotic adjustment solutes (soluble sugars,free amino acids and proline ) worked in coordination,which made soluble protein decomposed in small quantities,at the same time,permeability of plasma membrane and MAD increased slowly under long light and middle drought stress and grew by a small margin in certain time even under serious water stress.So,these materials and physiological mechanism were inherent basis of superior drought tolerance of seabuckthorn.
出处
《西北植物学报》
CAS
CSCD
2003年第1期23-27,共5页
Acta Botanica Boreali-Occidentalia Sinica
基金
中国科学院"西部之光"人才培养基金
知识创新基金(KZCX1-06)
水利部黄河上中游局科研基金资助项目(1997001)
