甘蔗不同品种（种）对干旱的生理反应

研究了７－１０个甘蔗品种（种）对干旱胁迫的生理反应，抗旱品种（种）有较大的伤流强度和较高的切叶自然失水速度，用聚乙二醇（ＰＥＧ６００）处理叶圆片，在这种水分胁迫下细胞膜透品种（种）比不抗旱的累积量要大。干旱使叶片细胞束缚水含量增加，抗旱力强的品种（种）较抗旱力弱的含量高。受旱后甘蔗淀粉酶活性的变化与品种（种）抗旱力的关系不很明确。

PHYSIOLOGICAL ROSPONRES TO WATER STRESS IN SUGARCANE SPECIES AND VARIETIES

Studies on the physiological response to water stress in 7-10 varieties (species)of sugarcane were carried out . Drought-resistant varieties (species)had a higher rate of bleeding and higher rate of water losing in detached leaves. The Plasmalemma permeability was increased under the water stress induced by PEG. The permeability was smallerr in drought - resistant varieties (species). Under soil drought stress conditions, drought - resistant varieties (species) accumulated comparatively higher free proline content than those in the less drought - resistant varieties. Cellular bound water content was increased and higher content of cellular bound water was found in drought - resistant varieties (species). The correlation between the change of amylase activity and drought resistance was not verv definite.