彩叶类凤梨半致死温度测定及其对温度的适应性评价

Determination of the Semi-lethal Temperature for Color-leaf Type Bromeliaceae and Their Adaptability to Temperature

关键词:  彩叶类凤梨  半致死温度  栽培管理  推广应用  温度适应性

Key words:  color-leaf type of Bromeliaceae  semi-lethal temperature  cultivation management  promotion and application  temperature adaptability

摘要:

彩叶类凤梨大多原产于热带地区。本研究设定了温度梯度实验，测试彩叶类凤梨在不同温度条件下的适应性。结合上海市冬夏季节的温度变化情况，分别设定了8个高温温度梯度（35-70℃，间隔5℃）和7个低温温度梯度（-25-5℃，间隔5℃），测定彩叶类凤梨叶片在不同温度条件下的电解质渗出率，并采用Logistic回归计算其高温、低温的半致死温度（LT₅₀）。结果表明，15种彩叶类凤梨叶片电解质渗出率与处理温度均呈S型曲线回归，拟合度较高。光萼荷属植物表现出高温半致死温度较高且低温半致死温度较低的特点，温度适应范围较广。半致死温度测定法可作为鉴定不同凤梨品种抗性的有效手段。本研究结果能为彩叶类凤梨的耐寒和耐热品种选择及推广提供理论依据。

Abstract:

Color-leaf type of Bromeliaceae are mostly native to tropical regions.In this research,a series of temperature gradients were set up to understand the adaptability of different kinds of color-leaf type Bromeliaceae under different temperature conditions.Based on the temperature changes in Shanghai during the winter and summer seasons,eight high-temperature gradients (from 35℃ to 70℃ with intervals of 5℃) and seven low-temperature gradients (from -25℃ to 5℃ with intervals of 5℃) were set respectively to study the variation of the electrolyte leakage of the leaves from 15 kinds of color-leaf type Bromeliaceae.The Logistic equation was used to calculate the high and low semi-lethal temperature (LT₅₀).The result showed that electrolyte leaching rate and treatment temperature of the 15 different kinds of color-leaf type Bromeliaceae showed S-shaped curve regression,and the goodness-of-fit was higher.The Aechmea has the characteristics of higher high semi-lethal temperature and lower low semi-lethal temperature, and their temperature range are wide.The semi-lethal temperature method can be used to identify the resistance of different Bromeliaceae varieties.The results of this study can provide a theoretical basis for the selection and promotion of cold-resistant and heat-resistant color-leaf type Bromeliaceae.