低温诱导对紫穗槐、刺槐抗寒性的影响

EFFECT OF COLD INDUCEMENT ON HARDINESS OF AMORPHA FRUTICOSA AND ROBINIA PSEUDOACACIA

通过３年的引种试验表明，紫穗槐和刺槐的地上部分在试验地区（年均温２．５℃、１月份气温－１６．１℃）受到不同程度的低温伤害，但它们的根系可安全越冬。３年的自然低温诱导，提高了根系的抗寒性，它们的ＬＴ５０分别降低了３．２℃和２．０℃；植物组织起始伤害温度也分别降低了２．０℃和２．６℃。低温伤害测定说明，它们的根系在低于某温度点时，会出现组织软化、褐变等现象，同时伴有甜味出现。用Ｌｏｇｉｓｔｉｃ曲线方程可以较好地描述低温对组织的伤害过程。

The introduction experiment for three years showed that the above ground parts of A. fruticosa and R. pseudoacacia were damaged differently coldness in the region (annual average temperature 2.5°t,Jan.average temperature -16.1℃), while the roots could safely survive the winter. The hardiness of roots had increased through three years of natural cold inducement,and LT50 values of them dropped 3.2℃ and 2.0℃ respectively. Meanwhile,the initial damage temperature also dropped 2.0℃ and 2.6℃ The chilling injury experiment demonstrated that roots had phenomenon of tissue softening and browning, accompanied with something of sweet taste. When temperature was below certain points, a Logistic equation could imitate well this chilling injury process.