沙冬青抗旱、抗寒机理的研究进展

由于长期在恶劣生境中生长,沙冬青逐步形成了与环境相适应的典型的超旱生结构。研究其抗旱机理表明:其根、茎、叶都通过其特有的结构实现抗旱、脱水,提高水的利用率;其水分生理指标表明沙冬青具有很强的抗旱性;其体内的可溶性糖、脯氨酸、保护酶系统在抗旱方面发挥一定的作用。沙冬青所具有的典型的超旱生结构也是其抵抗冬季严寒的主要方式之一;其根、茎、叶中存在着抗冻蛋白,对抵御冬季冷冻具有重要的作用;其体内的脯氨酸在抗寒方面也有一定作用。

Advances of Drought-resistance and Frigid-resistance Mechanism Research on Ammopiptanthus mongolicus

Growing long in bad environment, \%Ammopiptanthus mongolicus\% (Maxim) Cheng f. has gradually formed typical super-xeromorphic structures to adapt environment . Its mechanism of drought-resistance is as follows: its special structures in roots, stems and leaves that can resist drought, dehydration and raise water use efficiency; the indexes of water physiology in \%A. mongolicus\% show that it p ossesses drought-resistance obviously; it plays a role for \%A. mongolicus\% to contain soluble sugars, proline and protective enzymes. Its mechanism of frigid -resistance is as follows: its typical super-xeromorphic structures is one of main antifreeze forms in winter; antifreeze proteins (AFPs) in roots, stems and leaves may play an important role during the period of overwinter, and proline i s also effective.