海藻糖介导的信号转导与植物抗逆性

海藻糖是一种非还原性二糖，它广泛存在于细菌、真菌、酵母、昆虫、无脊椎动物和植物等生物体内。海藻糖不仅作为碳水化合物的储备，而且还是一个多功能分子。海藻糖作为一种信号分子，启动信号转导级联反应，改变基因表达和酶的活性，与激素也有一定的关系。采用基因工程和通过外源施加的方法增加海藻糖在植物体内的积累可以提高植物的抗逆性，这为提高农作物的抗逆性提供了新的策略。

Trehalose-mediated signal transduction and stress tolerance in plants

Trehalose is a non-reducing disaccharide widespread in organisms,including bacteria,fungi,yeast,insects,invertebrates and plants.It is not only a carbohydrate reservoir but also a multifunctional molecule.Trehalose,which have some connections with hormones,too,has been recognized as a signaling molecule to initiate signal transduction cascades that result in a series of cellular responses such as altering gene expression and enzymatic activities.Increasing the accumulation of trehalose in plants by both gene engineering and exogenously supplied trehalose can improve stress tolerance of plants,this offers a novel strategy for improving stress tolerance in crop plants.This article reviews the current achievements in trehalose-mediated signal transduction.