Effect of light, salinity, and temperature on seed germination of Limonium stocksii
Effect of light, salinity, and temperature on seed germination of Limonium stocksii
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DOI：
10.1139/b03-118
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发表时间：
2004-02
期刊：
影响因子：
1.1
通讯作者：
Saba Zia;M. Khan
中科院分区：
文献类型：
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作者：
Saba Zia;M. Khan
补血草Limonium stock sii(Boiss.)昆策(白花科)是一种多年生木本灌木，分布于巴基斯坦卡拉奇的鹰湾。在12h暗12h光照周期和完全黑暗条件下，研究了不同盐度(0、100、200、300、400和500 mm o l/L)和不同温度(10：20、15：25、20：30和25：35℃)条件下狼尾草种子萌发的反应。在20：30℃下，在0、100和200 mmol/L浓度下萌发率最高，约为100%，随着盐度的进一步升高，萌发率逐渐下降。在500 mmol/L的氯化钠溶液中，种子萌发率不到5%。15：25℃盐度处理对种子萌发的抑制作用略强于最适温度处理，而在10：20和25：35℃盐度处理下，种子萌发显著降低，当盐浓度高于200 mm o l/L时，种子萌发极少。在20：30℃条件下发芽最快，10：20℃条件下发芽最慢，黑暗条件下种子萌发相对较低，而盐分条件下12h光照条件下种子萌发效果较差。恢复实验表明，种子暴露在不同的盐度和温度条件下对种子的生活力影响不大。
Limonium stocksii (Boiss.) Kuntze (Plumbaginaceae) is a perennial, woody shrub distributed at Hawks Bay, Karachi, Pakistan. Experiments were carried out to investigate seed germination responses of L. stocksii at different sa- linities (0, 100, 200, 300, 400, and 500 mmol/L NaCl) and under different temperature regimes (10:20, 15:25, 20:30, and 25:35 °C), both in a 12 h dark : 12 h light photoperiod and in complete darkness. The highest percentage of ger- mination (about 100%) was obtained at 0, 100, and 200 mmol/L NaCl at 20:30 °C, and a further increase in salinity resulted in a gradual decrease in germination. Less than 5% of seeds germinated at 500 mmol/L NaCl. Germination under salinity treatment at 15:25 °C was slightly more inhibitory than the optimal temperature regime, whereas under both 10:20 and 25:35 °C temperature regimes, seed germination was substantially reduced and few seeds germinated at concentrations higher than 200 mmol/L NaCl. Germination rate was fastest at 20:30 °C and slowest at 10:20 °C. Rela- tively low seed germination was obtained in the dark in comparison to seeds germinated in a 12-h photoperiod under saline conditions. Recovery experiments showed that exposure of seeds to various salinity and temperature regimes had little effect on viability of seeds.