鹤望兰新株系耐寒性鉴定

Low-temperature Tolerance of a New Variety of Strelitzia reginae

自主选育的鹤望兰新株系与普通栽培株系相比,在福州极端低温下(-2℃)表现为耐寒性。为进一步验证,通过不同梯度的人工低温处理(0、-2、-3、-4、-5、-6℃),测定2株系叶片相对电导率并配合logistic回归方程计算低温半致死温度(LT50)。结果表明,2个株系相对电导率随处理温度的降低均呈"S"型变化,在试验低温范围内,与温度间极显著负相关,且新株系低温半致死温度为-4.8℃,栽培株系低温半致死温度为-3.6℃,新株系的半致死温度高于栽培株,进一步证实新株系具有耐寒性。

A newly bred strain of Strelitzia reginae showed superior resistance to the cold weather in Fuzhou as compared to its parent.To quantifiably verify the observation,relative electric conductivities of the leaves and semilethal temperatures(LT50)of the two cultivars were determined.LT50 was calculated using a logistic equation at a temperature gradient from 0,-2,-3,-4,-5to-6.The results showed that the conductivities significantly increased with decreasing temperature in an S-shape function.And,the LT50 of the new strain was-4.8,which was considerably lower than that of its counterpart,at-3.6.