关键词: 沙冬青, 旱生结构, 抗旱机理, 抗寒机理

Abstract: 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 possesses 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 is also effective.

Key words: Ammopiptanthus mongolicus, xeromorphic structure, drought-resistance, frigid-resistance