Effects of Low-temperature, NaCl and PEG Stress on Seed Germination and Seedling Growth of Cunninghamia lanceolata
In order to investigate the effects of low-temperature,NaCl and PEG treatment on seed germination and seedling growth of Cunninghamia lanceolata,the seeds collected from the third-generation seed orchard were chosen as materials to study the effects of low-temperature (4℃),0.025-0.3 mol/L NaC1 solution and 5％-30％ PEG solution on the seed germination rate,germination potential,germination starting time,germination time,seedling height,and the ratio of dry-and-wet weight of Cunninghamia lanceolata.The results showed that low-temperature treatment significantly reduced the seed germination rate and the ratio of dry-and-wet weight of Cunninghamia lanceolata and shortened the germination starting time and the germination time,but low-temperature treatment had no obvious effect on the seed germination potential and the seedling height.The concentration of NaC1 and PEG no less than 0.025 mol/L and 5％,respectively,could significantly reduce the seed germination rate and the germination potential.The limiting concentration of NaCl and PEG solution for seed germination of Cunninghamia lanceolata was 0.2 mol/L and 20％,respectively,namely,if the concentration was higher than the limiting level,seeds of Cunninghamia lanceolata would not sprout.0.025-0.1 mol/L NaCl and 5％-15％ PEG solution treatment significantly prolonged the seed germination starting time,shortened the seed germination time,lowered the height of the seedlings,and increased the ratio of dry-and-wet weight.
Cunninghamia lanceolatalow temperature stressNaCl stressPEG stressseed germinationseedling growth
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万方数据
维普
