8份柳枝稷种质资源苗期抗旱性综合评价

柳枝稷(Panicum virgatum)是重要的能源草之一,其苗期的耐旱能力是其能否在干旱、半干旱地区良好生长的关键。因此,鉴定并筛选出苗期耐旱的柳枝稷品种具有重要意义。本研究通过温室盆栽试验,对超氧化物歧化酶、过氧化物酶、游离脯氨酸、可溶性蛋白、可溶性糖、叶片含水量、相对电导率及丙二醛共8个耐旱相关的生理指标进行测定,并根据隶属函数法评价了选自美国基因库的8份柳枝稷材料的抗旱性。结果表明,8份柳枝稷材料在苗期的抗旱性各不相同,并且其抗旱性由大到小的排列顺序为ShawneeCave-in-RockBlackwellBN-309-69TrailblazerCarthageTEM-SLCGrenville。本研究结果可以为柳枝稷抗旱性育种提供理论依据,也可为其在边际土地上的推广应用提供科学的栽培管理依据。

Evaluation of drought resistance in seedlings of eight switchgrass accessions

Switchgrass (Panicum virgatum) is one of the important energy grasses,and the drought resistance of its seedling stage plays a key role in growth under arid and semi-arid conditions.Therefore,selecting switchgrass genotypes with good drought tolerance in the seedling stage is important.In greenhouse experiments,we tested eight physiological indicators related to drought resistance,including superoxide dismutase and peroxidase activity,free proline,soluble protein,soluble sugar and leaf water content,relative electrical conductivity,and malondialdehyde levels.In addition,we evaluated the drought resistance of eight switchgrass varieties chosen from American gene bank by subordinative function value analysis.The results showed that the eight accessions compared differed significantly in drought resistance at seeding stage.The drought resistance ranking was as follows:Shawnee＞Cave-in-Rock＞ Blackwell＞BN-309-69 ＞ Trailblazer＞ Carthage＞ TEM-SLC＞Grenville.The results provided a theoretical basis for developing switchgrass breeding programmes aiming to improve drought resistance,and valuable information for planting switchgrass varieties in marginal lands.