4种补血草属植物种子发芽对温度的响应

Seed germination responses of four Limonium species to temperature

以乡土种黄花补血草(Limonium aureum)和引种于民勤沙生植物园的二色补血草(L.bicolor)、大叶补血草(L.gmelinii)、耳叶补血草(L.otolepis)4种植物种子为材料,进行了温度对种子发芽影响的研究。结果表明,种子发芽率达最大值的温度范围黄花补血草为10～20℃,发芽率为95%～97%;二色补血草为15～25℃,发芽率为95%～100%;大叶补血草为20～35℃,发芽率在98%以上;耳叶补血草为20～30℃,发芽率为97.33%～98.67%。种子发芽势达最大值的温度范围黄花补血草为15～20℃;二色补血草15～20℃;大叶补血草为20～35℃;耳叶补血草为25～30℃。发芽指数达最大值的温度范围黄花补血草为15～20℃;二色补血草20～25℃;大叶补血草为25～30℃;耳叶补血草为20℃。发芽指数出现最大值的温度不一致,黄花补血草、二色补血草、耳叶补血草均在20℃出现最大值,发芽指数分别为36.26、37.26和24.34,大叶补血草在30℃出现最大值,发芽指数为33.12。幼苗长度最大值的温度范围黄花补血草为15～20℃;二色补血草为20～25℃;大叶补血草为25～30℃;耳叶补血草为20～25℃,4种补血草幼苗长度最大值分别出现在20、15、25和25℃,分别为4.31、2.38、1.59和1.38cm。综合各项指标,分析认为黄花补血草、二色补血草、大叶补血草和耳叶补血草种子发芽的适宜温度范围分别为15～20、20～25、25～30和20～25℃。

Seed germination responses to temperature in one indigenous species, Limonium aureum, and three introduced species, L. bicolor, L. gmelinii and L. otolepis were studied under controlled conditions in the laboratory. The temperature rang of seed maximum germination rate forL. aureum （95% to 97%） was 10 to 20 ℃, and for L. bicolor （95% to 100%）, L. gmelinii （over 98%） and L. otolepis （97% to 99%） were 15 to 25 ℃ , 20 to 35 %（.2 and 20 to 30 ℃ , respectively. The temperature rang for seed maxi mum germination potentiality of L. aureum was 15 to 20 ℃, for these ofL. bicolor, L. gmelini, and L. ololepis were 15 to 20 ℃, 20 to 35 ℃ and 25 to 30 ℃. The temperature rang of seed maximum germination index for L. aureum was 15 to 20 ℃, but for L. bicolor was 20 to 25 ℃, for L. gmelinii was 25 to 30 ℃ and for L. otolepis was 20 ℃. The maximum value of germination index appeared in different tempera lures, where for L. aureum, L. bicolor and L. otolepis appeared at 20 ℃ with the germination indexes of 36.26, 37.26 and 24.34, respectively. However, the maximum value of germination index for L. g melinii presented to 30 %（2 with the index of 33.12. The temperature rang of seedling length maximum value forL. aureum was 15 to 20 ℃, for L. bicolor was 20 to 25 ℃, for L.gmelinii was 25 to 30 ℃ and forL. otole pis was 20 to 25 ℃. In general, the optimum germination temperature range for four Limonium were 15 to 20 ℃, 20 to 25 ℃, 25 to 30℃ and 20 to 25 ℃, respectively.