花生种子萌发早期事件与活力的关系

花生种子萌发早期,不同活力胚轴的呼吸模式与吸水模式对应一致。吸胀初始活力低的种子吸水快,呼吸强度也高,停滞期后则活力高的种子吸水迅速,呼吸强度亦高。预吸胀处理减轻种子的渗漏,浸泡液的电导率和紫外吸收物质的数值下降,细胞的修复效率与种子活力有关。胚轴的膜脂不饱和度与种子活力亦呈正相关。Ca~(2 )与PAs处理可改善膜透性,减少渗漏,增加膜脂不饱和度。

Early Events in Germinating Peanut Seeds in Relation to the Vigour

The pattern of respiration was in accordance with the pattern of imbibition in embryonic axes of various vigor of seeds during the early germination.In the first stage of imbibition,the lower the seed vigour was,the faster the water inflow was,and the higher its respiration was;but it was different following a lag phase,the water uptake and respiration rate in seeds with high vigour were superior to those in low-vigour seeds.Seed vigour was negatively correlated to the leakiness of electrolyte(by conductivity test)and UV absorbing substances.Preim- bibition increased the effectiveness of restoring cell membrane integrity with the decrease of conductivity and UV absorption value.Seed vigour was positively cor- related to the degree of unsaturation of membranal fatty acids in the axes.With the treatments of Ca~(2 ) and PAs the membrane permea(?)ility was improved,and the leakage was decreased,and the degree of unsaturation of membranal fatty acids was increased.