溶氧、pH及其他理化因子对蓖齿眼子菜种子萌发的影响
EFFECTS OF DISSOLVED OXYGEN, pH AND OTHER PHYSICO2CHEMICAL FACTORS ON THE SEED GERMINATION OF POTAMOGETON PECTINATUS
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摘要: 研究了溶氧、pH、光强、冷处理、温度、营养以及激素处理等条件对蓖齿眼子菜种子萌发的影响。结果表明:溶氧对种子的最终萌发率有影响,缺氧条件下比正常条件和氧饱和条件下的萌发率高,但缺氧条件下萌发的幼苗为白化苗,不能正常生长发育;光照和pH对种子萌发的影响不显著。4℃冷处理能够使种子萌发时间提前和提高种子的萌发率;在15-27℃之间,提高温度能够加快种子的萌发速度,但温度过高则萌发率降低,在15℃、20℃和27℃下的最终萌发率分别为90.0%、90.0%和56.7%;不同的营养水平对种子萌发影响不显著。生长素NAA(0.1-5.0mg/L)、细胞分裂素6-BA(0.1-5.0mg/L)、赤霉素GA3(0.1-5.0 mg/L)不能加快蓖齿眼子菜种子萌发的速度和提高萌发率。Abstract: Restoration of aquatic ecosystemin eutrophic lakes relies on restoration of submerged vegetation. Vegetative and sexu2 al reproduction under eutrophic conditions may play important role in the establishment of submerged plant community. Pota2 mogeton pectinatus were widely distributed and abundant in Chinese lakes. In this study the effects of anoxia and other ecological factors, e.g. nutrients, light intensity, temperature, pH, pre-cooling treatment, on the germination of seeds of Potamogeton pectinatus were investigated.The effects of dissolved oxygen, pH, light, pre2cooling treatment, temperature, nutrients, and hormones on the germina-tion of seed of Potamogeon pectinatus were investigated. In comparison to the high dissolved oxygen condition, the germination rate under anoxia condition was enhanced, however, the sprouts loose capacity of pigment synthesis and cease development. Light intensity(0-2000lx)and pH(6-8) had no effect on the germination. Pre2cooling treatment of seeds under 4 ℃ for 30d and 150 d speeded up the germination and promoted germinatian rate. Incubation under higher temperature germinated earlier in the range of 15-27 ℃. The germination rates under 15, 20 and 27 ℃ were 90 %,90 % and 5617 % respectively. Nutrients had no effect on the germination. Auxin NAA(0.1-5.0 mg/L),cytokinin 6-BA(0.1-5.0mg/L)or gibberellin G A3(0.1-5.0mg/L) did not enhanced the germination rate.
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Keywords:
- Potamogeon pectinatus /
- Seed /
- Germination /
- Dissolved oxygen /
- pH
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