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以2年生北美丁香“詹姆斯”为试材,用盆栽方法人工模拟土壤干旱胁迫条件,研究了其生长和部分抗旱生理生化指标对水分胁迫的响应。结果表明:丁香苗具有一定的抗旱耐旱潜力,当遭遇干旱胁迫时,其可以通过调节自身的渗透调节物质含量和保护酶活性来减轻干旱伤害。随着干旱胁迫加剧,丁香苗植株高度和茎基生长速率逐渐降低,在重度干旱胁迫下生长几乎停止;随着干旱胁迫强度的增加,其叶片叶绿素和相对含水率(RWC)含量逐渐降低;叶片相对电导率、丙二醛(MDA)和脯氨酸(Pro)含量呈现不断增多的趋势;超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和过氧化物酶(POD)活性先升高后降低,在干旱胁迫40d时活性达到最高,在干旱胁迫50d后其含量不断降低。
A 2-year-old North American Lilac “James ” was used as experimental material, and potted plants were used to simulate the conditions of soil drought stress. The responses of physiological and biochemical indexes of drought-resistance to water stress were studied. The results showed that: Clove seedlings have a certain potential drought drought tolerance, when subjected to drought stress, they can regulate their osmotic adjustment substances and protect the activity of enzymes to reduce drought damage. With the aggravation of drought stress, the plant height and the growth rate of stems of clove seedling decreased gradually and almost stopped under the severe drought stress. The contents of chlorophyll and relative water content (RWC) decreased with the increase of drought stress. (MDA) and proline (Pro) content showed a trend of increasing with the relative conductivity. The activity of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) Increased and then decreased, reached its maximum at 40 d of drought stress, and decreased continuously after 50 d of drought stress.