| 摘要: |
| 以红皮糙果茶（Ｃａｍｅ ｌ ｌ ｉ ａｃ ｒ ａ ｐ ｎ ｅ ｌ ｌ ｉ ａｎａ）、伯乐树（Ｂｒ ｅ ｔ ｓ ｃ ｈｎ ｅ ｉ ｄ ｅ ｒ ａｓ ｉ ｎｅ ｎｓ ｉ ｓ ）、金花茶（Ｃｐ ｅ ｔ ｅ ｌ ｏ ｔ ｉ ｉ ）、坡 垒（Ｈｏ ｐ ｅ ａｈａ ｉ ｎ ａｎ ｅ ｎｓ ｉ ｓ ）４种珍稀濒危植物１ａ生幼苗的成熟叶片为试验材料，进行高温、低温胁迫试验，测 定叶片相对电导率，并利用Ｌｏ ｇ ｉ ｓ ｔ ｉ ｃ方程建立回归模型，计算出高温和低温半致死温度。结果表明：在高温 胁迫和低温胁迫过程中，相对电导率变化趋势均呈现明显的“Ｓ”型曲线，耐热性大小顺序依次为：金花茶＞红 皮糙果茶＞坡垒＞伯乐树，高温半致死温度在４ １.６～４ ６.３℃之间；耐寒性大小顺序依次为：红皮糙果茶＞ 坡垒＞伯乐树＞金花茶，其低温半致死温度在－７.１ ９～－６.１６℃之间。供试的４种珍稀濒危植物１ａ生苗 均具有较强的耐热性和耐寒性，在广州地区可以安全露地越夏及越冬。研究结果可推测这４种珍稀濒危植 物潜在的适应地区，从而扩大引种栽培。 |
| 关键词: 珍稀濒危植物,半致死温度,相对电导率,Logistic方程 |
| DOI： |
| 投稿时间：2016-11-23修订日期：2016-12-02 |
| 基金项目:广州市科技计划项目（2012J2200060）、广东省林业厅“珍稀濒危植物坡垒的救护与种群扩繁”、韶关地区国家第二次重点保护野生植物资源调查 |
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| study on the Median Lethal Temperature of 4 Rare Endangered Plant Species |
| GUO Yanan,LI Shiyu,MU Nan,YU Hailing,WANG Faguo |
| (South China Botanical Garden,Chinese Academy of Sciences) |
| Abstract: |
| One-year-old leaves of 4 rare or endangered species were used to determine conductivity under high and low temperature treatment. They were Camellia crapnelliana, Bretschneidera sinensis, Camellia petelotii, Hopea hainanensis. The high and low semi-lethal temperature (LT50) were calculated by using conductance method with Logistic Equation. The results showed that the relative conductivity were increased like “S” as temperature treatment. The thermo tolerance of the tested species was listed as Camellia petelotii > Camellia crapnelliana > Hopea hainanensis > Bretschneidera sinensis. The semi-lethal temperature ranged from 41.6℃ to 46.3℃. And the cold tolerance of them was listed as Camellia crapnelliana> Hopea hainanensis> Bretschneidera sinensis> Camellia petelotii. The semi-lethal temperature ranged from -7.19℃to -6.16℃.All the four species were found to have a certain heat and cold tolerance. These data could be used for predicting the potential geographical distribution of the 4 species. This result could provide the theory basis for conservation and the application in greening of these species. |
| Key words: rare or endangered species semilethal temperature electric conductivity logistic equation |
