高温胁迫对金钻蔓绿绒耐热性的影响

为了明确金钻蔓绿绒对高温环境的忍耐能力，以3～5个叶片的金钻蔓绿绒扦插苗为试材，以室温为对照，研究了高温（35、40和45℃）胁迫不同时间（8、16、24、32和40h）对金钻蔓绿绒叶片相对电导率和丙二醛含量的影响。结果表明：叶片相对电导率随胁迫温度的升高而逐渐降低、随胁迫时间的延长而逐渐上升，其中35℃所有胁迫处理的叶片相对电导率均显著〉其CK，胁迫温度升高后叶片相对电导率反而显著下降甚至与其CK差异不显著，说明高温胁迫导致叶片细胞膜受害程度加深，温度过高时细胞甚至解体而失去活性；丙二醛含量随胁迫温度的升高和胁迫时间的延长均持续增加，除35℃胁迫8h处理的叶片丙二醛含量显著〈其CK外，其他高温处理的丙二醛含量均显著〉其CK。植物所处的环境温度越高、时间越长，其叶片细胞受到的生理伤害就明显越重，综合分析高温胁迫对叶片相对电导率和丙二醛含量的影响，认为金钻蔓绿绒可以勉强忍耐35℃高温8h。

Effect of High Temperature Stress on the Heat Resistance of Diamond philodendron

In order to clarify the endurance of Diamond philodendron to high temperature environment, using cutting seedlings of Diamond philodendron with 3 - 5 blades as the test material, the room temperature as control, the effects of high temperature （35, 40 and 45 ℃ ） stress at different times （8, 16, 24, 32 and 40 h） on the relative conductivity and MDA content of Diamond philodendron leaves were studied. The results showed that the leaf relative conductivity was decreased gradually with the elevation of stress temperature and increased gradually with prolonging of stress time, the leaf relative conductivity of all stress treatments at 35 ℃ were significantly higher than that of CK, when the stress temperature rises, leaf relative conductivity was significantly decreased or even had no significant differences with CK, it indicated that high temperature stress caused deepen of cell membrane damage degree, when the temperature is too high, cell was disintegrated and lost activity. MDA content was increased with the elevation of stress temperature and prolonging of stress time, MDA content of leaves at 35 ~C 8 h was significantly lower than that of CK, and that of other high temperature treatments was remarkably greater than CK. The plant environment temperature is higher, the time is longer, the physiological injury of its leaf cells is significantly more weight. Comprehensive analysis of effects of high temperature stress on leaf relative conductivity and MDA content, it considered that Diamond philodendron could barely endure high temperature of 35℃ 8h.