Study on the Physiological Characteristics of Hibiscus hamabo under Stress

Abstract

Study on effect of treatment of different water immersion height and duration on physiological characteristics change of Hibiscus hamabo under saline and alkali stress showed that the main factor damaged to H.hamabo was high salt stress,and it was not adapted to high saline and alkali and water stress for lacking relevant organs and physiological mechanism,and the plant were at physiological drought condition.Water content of leaf,stem and bark,net photosynthetic rate,stomatal conductance,transpiration rate,water use efficency and photochemical efficiency decreased.With the duration of stress,the contents of chlorophyll a,chlorophyll b and carotenoid declined,while relative conductivity,damage rate,contents of proline and malondialdehyde increased.