福建柏不同无性系对干旱胁迫的生理响应及抗旱性评价

Physiological Response of Different Clones of Fokienia hodginsii to Drought Stress and Evaluation of Drought Resistance

本文通过对福建柏不同无性系的干旱胁迫处理试验,分析不同无性系对干旱胁迫的生理响应差异性,通过36d的干旱胁迫处理,福建柏不同无性系之间表现出不同的伤害程度,在参试的15个无性系中,14号、15号、23号、24号等4个无性系表现出较强的抗旱特性。通过胁迫处理,重度、中度和轻度伤害的无性系的相对含水量较处理前分别下降了15.40%、9.53%和4.12%,在干旱胁迫初期,轻度和中等伤害的无性系会主动增加自身叶片含水量来应对干旱胁迫,而重度伤害的主动调节能力较差。不同胁迫伤害程度的无性系叶片的叶绿素随着胁迫天数的增加均呈现"升高-下降"的变化趋势,重度和中度伤害的无性系的叶绿素含量较处理前分别下降了21.70%和13.62%,轻度伤害的无性系处理前后变化不明显,说明其叶绿素的补偿能力要优于重度和中度伤害的无性系。不同胁迫伤害程度的无性系叶片的电导率随着胁迫天数的增加均呈现出"逐渐升高"的变化趋势,重度、中度和轻度伤害的无性系的电导率分别是处理前的3.97、3.29和2.67倍,叶片细胞膜系统的伤害程度反映了其最终的整体伤害程度。

The research analysed the physiological differences of different clones of Fokienia hodginsff in the response to drought stress. After 36 days of drought stress, there were different degrees injury in different clones of Fokienia hodginsii. The clones of No.14, No. 15, No.23 and No.24 showed strong drought resistance among the 15 clones tested. Through the stress treatment, the relative moisture content of severe, moderate and mild injury clones respectively decreased by 15.40%, 9.53% and 4.12% compared with that before treatment. In the early drought stress, the mild and moderate injury clones will take the initiative to increase their leaf water content to deal with drought stress, but the severe injury clones is the worst with the active regulation capacity. With stress days increase, leaves＇ chlorophyll of different injuries degree clones showed ＂elevated-down＂ trend, and the chlorophyll content of severe and moderate injury clones respectively decreased by 21.70% and 13.62% compared with that before treatment, but the changes of mild injury clones were not obvious. Chlorophyll compensation ability of mild injury clones was superior to moderate and severe injury clones. With stress days increase, leaves＇ electrical conductivity of different injury degree clones showed ＂gradually increasing＂ trend, and that of severe, moderate and mild injury clones were 3.97, 2.29 and 2.67 times of that before treatment, and the degree of injury leaves＇ cell membrane system reflects the overall extent of its final injury.