摘要
[目的]考察不同海拔黄花软紫草生长及生理特性,探讨其不同生境下的生态适应机制,为其野生资源保护利用提供依据.[方法]以塔里木盆地西北部乌什县黄花软紫草为研究对象,观测5个海拔(1 155,1 227,1 332,1 533,2 137 m)下叶片形态、植株生长,光合色素、渗透调节物质含量及抗氧化酶活性.[结果]随着海拔增加,黄花软紫草株高、地上生物量、总生物量、叶面积、比叶面积以及叶绿素a、b含量逐渐下降,最高海拔处株高、地上生物量、比叶面积分别比最低海拔处显著下降22.89％、31.77％和26.58％,同时比叶重、根冠比和类胡萝卜素含量、类胡萝卜素/叶绿素、丙二醛、脯氨酸、可溶性糖含量以及抗坏血酸过氧化物酶、过氧化物酶活性均逐渐增加,且最高海拔与最低海拔处差异显著.[结论]乌什县黄花软紫草生长和生物量积累在海拔1 155 m处最佳,其受到环境胁迫随着海拔升高而加重,但其能通过调整生活策略、提高渗透调节物质含量和抗氧化酶活性以适应高海拔生境.
Abstract
[Objective]The study aims to investigate the growth and physiological characteristics of Arnebia guttata along the altitudinal gradients,in order to understand its ecological adaptation mechanism under different habitat conditions and provide a theoretical basis for the conservation and utilization of the wild resources of A.guttata.[Methods]A.guttata in Wushi County in northwestern Tarim Basin was chosen as the research subject.The leaf morphology,growth indicators,photosynthetic pigments,pro-line,soluble osmoregulatory substances,malondialdehyde content,and the activities of antioxidant en-zyme were measured at five different altitudinal sites(1 155,1 227,1 332,1 533,2 137 m).[Results]The plant height,aboveground biomass,total biomass,leaf area,specific leaf area,and the content of chlorophyll a and chlorophyll b of A.guttata were the highest at the lowest altitude(1 155 m)and decreased with increas-ing altitude,reaching the lowest at 2 137 m.Among them,plant height,aboveground biomass,and leaf area were decreased by 22.89％,31.77％,and 26.58％,respectively.The minimum value of specific leaf mass,root/shoot ratio,and carotenoid content,carotenoid/chlorophyll ratio,malondialdehyde,proline,soluble sugar,and ascorbate peroxidase and peroxidase enzyme activity of A.guttata were at 1 155 m,and increased with increasing altitude,reaching the maximum at 2 137 m.[Conclusion]The environmental condition of lower altitude is conducive to the growth and biomass accumulation of A.guttata in Wushi County.As altitude rises,the physiological stress on A.guttata becomes intensified,which adapts to the harsh environment to increase the soluble osmotic substances and the activity of antioxidant enzymes.
基金项目
塔里木大学胡杨英才项目(TDZKSS202347)
塔里木大学胡杨英才项目(TDZKSS202348)
维普
万方数据