干旱胁迫对冷地型草坪草生理特性影响的研究

研究了Fylking草地早熟禾(Poapratensis)、Target多年生黑麦草(Loliumperenne)、Cindy紫羊茅(Festucarubra)的幼茎和幼根在不同的干旱条件下超氧化物酶(SOD)、过氧化物酶(POD)的酶活性生理指标变化。试验结果发现,随着干旱程度的加剧,草坪草体内可溶性蛋白质含量呈现逐步增多的趋势;在同等干旱条件下,根系中的可溶性蛋白质增加量大于茎叶中可溶性蛋白质的增加量;可溶性蛋白质含量及SOD、POD在草坪草受干旱胁迫时,能清除体内过量的活性氧,维持代谢平衡从而使草坪草在一定程度上忍受、减缓或抵抗不良环境的胁迫;草坪草幼苗的不同器官对干旱胁迫的反应不同,幼茎的耐脱水能力大于幼根;通过试验发现,SOD和POD酶活性可作为鉴定草坪草品种抗旱性大小的重要生理指标之一。

Effects of drought stress on physiological characteristics in cool season turfgrasses

Effects of drought stress on the changes of physiological characteristics were carried out on Cool Season Turfgrasses by using Fylking(Poa pratensis), Target(Lolium perenne)and Cindy(Festuca rubra). The results showed that concentration of soluble protein in grasses increase with drought enhancing;quantities of soluble protein in root increase more than that in leaf under same drought stress; Soluble protein, SOD and POD activities could clean the excessive free radical and maintain the balance of metabolism, and inducing turf grasses tolerate drought stress in a certain extent. The drought tolerance of younger stems of turf grasses is better than those of younger roots. Activity of SOD and POD can be used as one of physiology index for identification drought tolerance on turf grasses.