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中国沙漠  2005 

荒漠植物种子萌发研究进展

Keywords: 荒漠植物,种子萌发,研究进展

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Abstract:

对种子自身结构,水分、温度、光照、沙埋深度等对荒漠植物种子萌发的影响进行了综述。硬实种子的不透水性、不透气性以及物理障碍是影响种子萌发的重要因素,通过热水浸种、擦破种皮或果皮、浓硫酸浸泡、低温或辐射处理可以破除硬实的影响。有些荒漠植物果皮或种皮外包有粘液层,这种结构对种子的萌发及幼苗生长有促进作用;部分植物的种胚覆盖物含有生长抑制物质而抑制种子萌发;胚休眠与后熟是影响胚萌发的重要生理因素。雨量大小、分布,降雨次数及土壤湿度是决定荒漠植物种子萌发的重要生态因子;温度影响种子的萌发,变温促进萌发;部分荒漠植物种子的萌发需要光照,有些要在暗中萌发,有些则对光无特异的需求;沙埋深度可调节光照、土壤湿度和土壤温度,从而调节种子萌发。应重视荒漠植物种子对严酷环境适应的研究,从分子水平上阐述其对严酷生境的适应机制。

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