几种环境因子对黄花矶松种子萌发的影响

Effect of environmental factors on seed germination of Limonium aureum

以黄花矶松(Limonium aureum)种子为材料,通过培养皿纸上发芽法和盆钵法,研究了温度、光照、水分、盐分和埋藏深度几种环境因子对黄花矶松种子萌发的影响。结果表明,1)温度、光照及其互作显著影响种子萌发(P<0.001),随温度升高,种子萌发率与萌发速率先升高后降低,在温度为25、30和20/30℃时最高;在35和40℃时,光照显著促进种子萌发(P<0.05),其他温度条件下无显著效应(P>0.05);2)种子萌发率与萌发速率随干旱胁迫和盐胁迫程度的增加呈下降趋势,对水分与盐分胁迫耐受的半致死浓度分别为-0.64和-0.84 MPa(0.201mol·L^(-1)),在低渗透势下,种子在盐分胁迫下比水分胁迫下萌发更好;3)随埋藏深度增加,黄花矶松种子萌发率呈现先增加后减少的趋势,其适宜播种深度为0.5cm。

The effect of temperature,light,water,salt,and burial depth on seed germination of Limonium aureum was analyzed.The results indicated that：1）Temperature,light and their interaction significantly affected L.aureumseed germination（P0.001）.Germination percentage and germination rate increased initially and then decreased with increasing temperature,and reached the highest when the temperature was 25,30,and20/30 ℃.When the temperature was 35 and 40℃,light promoted seed germination of L.aureumsignificantly（P〈0.05）,whereas light showed no effect at other temperatures（P〉0.05）;2）With increasing drought and salt stress,germination percentage and germination rate of L.aureumdecreased gradually.The median lethal concentrations of drought resistance and salt tolerance for L.aureum were-0.64 and-0.84 MPa（0.201 mol·L^-1）,respectively.When osmotic potential was low,seeds under salt stress germinated better than those under drought stress;3）The optimal sowing depth of L.aureumseeds was 0.5 cm.;therefore,these seeds are possibly suitable for shallow seedling.