PEG模拟干旱胁迫对11份黄麻种子萌发的效应

【目的】筛选出萌发期抗旱性较强的黄麻品种，并建立黄麻萌发期抗旱性评价体系。【方法】在聚乙二醇（PEG）（PEG6000）模拟干旱胁迫条件下，采用培养皿法对11个黄麻种子进行发芽试验，PEG设6个浓度处理，分别为（A）5％、（B）10％、（C）15％、（D）20％、（E）25％，测定种子发芽各项指标。【结果】随着PE咙理浓度的升高，黄麻种子的相对发芽势、相对发芽率、相对发芽指数、相对活力指数、相对胚根长、相对胚芽长均呈下降趋势；低浓度PEG（5％）处理促进黄麻种子胚根的生长，而较高浓度PEG（10％-25％）处理则抑制其胚根生长；圆果种黄麻中以圆09—30、圆09—35发芽最好，圆3号最差；长果种黄麻中以长09-41、长09-40发芽最好，长09—1最差。【结论】5％～10％的PEG可作为区分长果种黄麻萌发期抗旱性差异的适宜浓度，15％～20％的PEG可作为区分圆果种黄麻萌发期抗旱性差异的理想浓度。

Effect of PEG induced drought stress on the germination indices of different varieties of Corchorus capsularis L.

Objective]The present experiment was conducted to screen the different varieties of Corchorus capsulads L. for drought resistance in germination period, and to establish the evaluation system of drought resistance. MethodlThe seeds of eleven different varieties of Corchorus capsulads L. were germinated in petri dishes under different concentrations （5, 10, 15, 20 and 25%） of polyethylene glycol （PEG6000）. Seed germination indices, viz., relative germination rate （RGR）, relative germination energy （REG）, relative germination index （RGI）, relative vigor index （RVI）, relative radicle length （RRL）, relative embryo length （REL）, were determined. Result]It was observed that RGR, REG, RGI, RVI, RRL and REL in seeds of all the varieties of Corchorus capsulads L. decreased with the increasing concentration of PEG. However, low concentration of PEG （5%） promoted RRL in Corchorus capsulans L. seeds, and 10-25% PEG concentration inhibited its REL. Among the varieties of C. capsulads, Yuan 09-30 and Yuan 09-35 recorded best RGR, while Yuan 3 showed the worst. Out of C. olitorius varieties, Chang 09-41 and Chang 09-40 recorded best RGR, while Chang 09-1 showed the worst. Conclusion]The concentrations of PEG ranging from 5-10% and 15-20% were found the best in terms of differentiating in varieties of C. olitorius and C. capsularis, respectively, for drought resistance during the germination period.