外源SA对干旱胁迫下金莲花种子萌发及幼苗生长的影响

Effects of Exogenous SA on Seed Germination and Seedling Growth of Trollius Under Drought Stress

为提高金莲花种子萌发和幼苗生长阶段的抗旱性,试验选用采自河北小五台山国家级自然保护区的金莲花种子,利用PEG-6000模拟干旱,探讨了外源SA对干旱胁迫下金莲花种子萌发和幼苗生长的影响,并探索了减轻干旱胁迫危害的最适SA浓度及各个生长指标、生理指标的变化规律。结果表明:通过对不同处理及对照的发芽率、发芽势、发芽指数、根冠比、相对含水量、叶片叶绿素含量以及叶片相对电导率进行测定比较,外源SA的最佳缓解浓度为1.0 mmol/L。该结论为促进其规范化栽培和扩大其在干旱半干旱地区的种植范围提供了科学依据。

In order to improve drought resistance in Seed Germination and seedling growth stage of Trolliuschinensis,this paper takes the seeds collected from Xiaowutai Mountain National Nature Reserve of Hebei Provinc in this experiment.PEG-6000 was used to simulate drought,to investigate the effects of exogenous SA on Seed Germination and seedling growth of Trolliuschinensis,and toexplore the optimum SA concentration,growth index and physiological index to alleviate drought stress.The germination rate,germination potential,germination index,root-shoot ratio,relative water content,chlorophyll content and relative conductivity of leaves of different treatments and controls were measured and compared.The result showed that the optimal remission concentration of exogenous SA was 1.0 mmol/l.This conclusion provides a scientific basis for promoting its standardized cultivation and expanding its planting range in arid and semi-arid areas.