论文部分内容阅读
如果缩短种子萌发时间,就可改善草地补播中种子的定植。许多植物种子萌发时间缩短是渗透势对种子水合作用的调控,而非胚根出现所致。通过生长萌发试验,评价‘FlintLock’西方小麦草(Pascopyrum smithii(Rydb.)A.Love)和‘Uinall’俄罗斯新麦草(Psathyrostachys juncea(Fischer)Nevski)在—1.5,—2.0,—2.5MPa渗透压下,分别处理4,8,12,16,20d后,对种子萌发和根系生长的影响。‘Nordan’沙生冰草(Agropyron desertorum(L.)Gaertn.)和‘Tegmar’中间冰草(Agropyron inter-medium Beauv.)在—2.0,—2.5,—3.0MPa下分别处理4,8,12,16,20d后观测。第二项研究观测渗透调节处理过的4种草种,达到50％萌发率的最短时间的渗透调节条件,并在该最佳渗透调节条件下风干0,1,7d后对种子萌发的影响。渗透调节处理的俄罗斯新麦草和西方小麦草种子与对照相比,萌发快2～4d。在最佳渗透调节处理下,4种草种产生20％～67％根系的时间比对照快4d,并且种子风干7d后萌发快于未风干处理的。而渗透调节处理种子根系的缓慢生长,可能会使从快速萌发获得的效果有所抵消。
If you shorten the seed germination time, we can improve the sowing of seeds in grass sowing. The shortening of seed germination time in many plants is the regulation of osmotic potential on the hydration of seeds, but not the emergence of radicles. FlintLock ’A. Love’ and ’Uinall’ Psathyrostachys juncea (Fischer) Nevski were evaluated for their osmotic pressure at -1.5, -2.0, -2.5 MPa by growth germination test , Respectively, after 4, 8, 12, 16, 20d, respectively, on seed germination and root growth. ’Nordan’ Agropyron desertorum (L.) Gaertn.) And ’Tegmar’ Agropyron inter-medium Beauv. Were treated at -2.0, -2.5, -3.0 MPa, respectively, , 16,20d after observation. The second study observed the osmotic adjustment of the treatment of four species of grass, to achieve the 50% germination rate of the minimum time of osmotic adjustment conditions, and in the best conditions of osmosis air-dried 0,1,7 d after the seed germination. Osmotic regulation of Russian new wheatgrass and Western wheatgrass compared with the control, germination fast 2 ~ 4d. Under the optimal osmotic adjustment, the time of emergence of 20% ~ 67% roots of 4 species of grass was 4 days faster than that of the control, and germination was faster than that of the non-air-dried seed after 7 days of air-drying. However, osmotic adjustment of the slow root growth of the seed may offset the effect of rapid germination.