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试验对3种豆科牧草紫花苜蓿、草木樨、沙打旺的种子,在萌发阶段对盐渍环境的适应性和离子调控机制进行了研究,测定了盐渍环境中种子的萌发率和恢复萌发率;同时,对400mmol·L-1NaCl处理后,种子恢复萌发、胚的主要离子含量变化、水分吸收等情况进行了测定。结果表明:50mmol·L-1NaCl处理中,紫花苜蓿种子的最终萌发率受到明显的抑制而降低;300mmol·L-1NaCl溶液处理中,草木樨的最终萌发率明显高于紫花苜蓿和沙打旺;沙打旺种子的初始萌发过程被300mmol·L-1NaCl抑制而推迟,推迟的时间长于紫花苜蓿和草木樨达5d。400mmol·L-1NaCl处理种子1、2和4d后,3种植物种子的吸水速率受到明显抑制;紫花苜蓿种子的恢复萌发率明显低于草木樨和沙打旺;紫花苜蓿种子胚积累的Na+明显高于草木樨和沙打旺,而且有较多的K+和Ca2+养分离子流失。盐渍环境下,3种牧草种子萌发受到的影响是由于渗透胁迫和离子毒害引起的,但3种植物种子的生理适应机制却存在明显的差异。
Experiments were conducted on the adaptability of three kinds of leguminous alfalfa, Radix moutan, and Astragalus adsurgens seedlings to the saline environment during the germination stage and the ion regulation mechanism. The germination rate and the recovery of germination At the same time, 400mmol·L-1NaCl treatment, seed germination, changes in the main ion content of embryos, moisture absorption were measured. The results showed that the final germination rate of alfalfa seeds was significantly reduced and decreased when treated with 50 mmol·L-1 NaCl, and the final germination rate was significantly higher than that of Medicago sativa and Astragalus in 300 mmol·L-1 NaCl solution The seed germination process was delayed by 300 mmol·L-1 NaCl inhibition, which was delayed for longer than that of Medicago sativa and Rhizoma. After 1, 2 and 4 days of seed treatment, the water absorption rate of three kinds of plant seeds was significantly inhibited; the recovery germination percentage of alfalfa seeds was significantly lower than that of A. sativa and Astragalus adsurgens seeds; the Na + accumulation of seed embryos of alfalfa seeds was significantly higher On the shrubs and sand Astragalus, and more nutrients K + and Ca2 + loss. The effects of osmotic stress and ion toxicity on the germination of three species of forage grasses were affected by salt stress. However, the physiological adaptation mechanisms of the three species of seeds were significantly different.