关键词: 香蕉枯萎病, 香蕉枯萎病, 内生放线菌, 定殖, 防控效果

Abstract: In order to investigate the effects of low-temperature, NaCl and PEG treatment on the seeds germination and seedlings growth of Cunninghamia lanceolata, their seeds collected from the third-generation seed orchard were chosen as material to be tested for purpose of the present research project so as to conduct studies on the effects of the 4℃ low-temperature, 0.025-0.3 mol/L NaCl solution, 5%-30% of 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 had significantly reduced the seed germination rate and the ratio of dry-and-wet weight of Cunninghamia lanceolata and shortened the germination starting time and germination time, but low-temperature treatment had no obviously effects on the seed germination potential and seedling high. The concentration which was not less than 0.025 mol/L NaCl and 5% PEG had significantly reduced the seed germination rate, germination potential. The limiting concentration of NaCl and PEG solution for seeds germination of Cunninghamia lanceolata was 0.2 mol/L and 20% respectively, namely, if larger than these concentrations, seeds of Cunninghamia lanceolata would not sprout. 0.025-0.1 mol/L NaCl and 5%-15% PEG solution treatment had significantly prolonged the seed germination starting time, shortened seed germination time, lowered the height of the seedlings, and added the ratio of dry-and-wet weight.