摘要
梭梭是我国西北荒漠中分布的多年生植物 ,属中亚荒漠植被成分。其种子萌发的最适温度为 10℃ ,亚适宜温度为 15～ 2 0℃。从 2 0℃起 ,温度越高 ,萌发比率越低。种子无论在光下和暗中都能萌发 ,萌发率无显著性差异。浓度低于 0 .2mol/L的NaCl溶液对萌发的影响不大 ;但从 0 .8mol/L起 ,萌发率随着浓度增高而降低 ,直至为零。将在盐溶液中处理 9d的种子转移至蒸馏水后 ,原来较高浓度下的种子具有较高的萌发恢复率。不同浓度下的种子的萌发率和萌发恢复率要比蒸馏水中的低 ,表明NaCl处理后的部分种子永久地失去萌发力。
The germination characteristics of Haloxylon ammodendron, a shrubby perennial distributed in many areas of deserts of Northwest China, and in the Central-Asian Desert phytogeographic region, were studied. The optimal temperature for germination was 10℃, the sub-optimal temperatures were 15 to 20℃. From 20℃, the higher the temperature, the lower the percentages of germination (Figs.1,2). No difference was found between the germinability of its seeds in light and in darkness (Fig.2). Germination was not affected by NaCl at concentrations below 0.2 mol/L, and was decreased by NaCl at higher concentrations, and fell to nearly 0 after 0.8 mol/L (Fig.3). Seeds that were incubated in NaCl solution for 9 d recovered after being transferred to distilled water and the percentage of recovery from high salinity concentrations was higher than low concentrations. The percentages of germination in NaCl and those after being transferred to distilled water were lower than the non-saline control, indicating that parts of the NaCl treated seeds have permanently lost their germination ability (Table 1).
出处
《植物生理与分子生物学学报》
CAS
CSCD
2001年第3期275-280,共6页
Journal Of Plant Physiology and Molecular Biology
基金
国家自然科学基金 ( 30 0 0 0 0 21
39893360 )
中国科学院知识创新项目(浑善达克沙地与京北农牧交错区环境综合治理试验示范研究 )
中国科学院留学经费择优支持回国工作基金
教育部留学回国人员科研启动基金
中国科学院王宽诚博士后工作奖励基金资助
关键词
梭梭
光照
温度
土壤盐分
种子萌发
萌发恢复
Haloxylon ammodendron
light
temperature
soil salinity
seed germination
recovery of germination
