Soybean is an important cash crop and its productivity is significantly hampered by salt stress. High salt imposes negative impacts on growth, nodulation, agronomy traits, seed quality and quantity, and thus reduces t...Soybean is an important cash crop and its productivity is significantly hampered by salt stress. High salt imposes negative impacts on growth, nodulation, agronomy traits, seed quality and quantity, and thus reduces the yield of soybean. To cope with salt stress, soybean has developed several tolerance mechanisms, including： （i） maintenance of ion homeostasis; （ii） adjustment in response to osmotic stress; （iii） restoration of osmotic balance; and （iv） other metabolic and structural adaptations. The regulatory network for abiotic stress responses in higher plants has been studied extensively in model plants such as Arabidopsis thaliana. Some homologous components involved in salt stress responses have been identified in soybean. In this review, we tried to integrate the relevant works on soybean and proposes a working model to describe its salt stress responses at the molecular level.展开更多
研究了影响大豆幼胚培养体细胞胚胎发生频率的9个因素。诱导体细胞胚胎发生的适宜幼胚长度为4mm;随着供俸植株发育阶段的提高诱导频率下降;最适基本培养基为 MS 培养基;蔗糖浓度从1.5%提高到9%,诱导频率逐渐下降;过高的维生素 B_1浓度...研究了影响大豆幼胚培养体细胞胚胎发生频率的9个因素。诱导体细胞胚胎发生的适宜幼胚长度为4mm;随着供俸植株发育阶段的提高诱导频率下降;最适基本培养基为 MS 培养基;蔗糖浓度从1.5%提高到9%,诱导频率逐渐下降;过高的维生素 B_1浓度对胚胎发生不利;2,4-D 的诱导效果优于 NAA,适宜的2,4-D 浓度为20ppm;光、暗处理与生长素种类和浓度之间存在交互作用;接种方式对诱导频率影响很大,体细胞胚只在下表皮与培养基接触的幼子叶的上表皮上产生,当上表皮与培养基接触时,两个表皮都不能产生体细胞胚;被试的所有基因型都能被诱导胚胎发生,不同基因型的诱导频率存在差异。展开更多
基金Supported by the Hong Kong RGC Earmarked Grant CUHK4434/04Mthe Hong Kong UGC AoE Plant and Agricultural Biotechnology Project AoE-B-07/09 (to H.M. Lam).
文摘Soybean is an important cash crop and its productivity is significantly hampered by salt stress. High salt imposes negative impacts on growth, nodulation, agronomy traits, seed quality and quantity, and thus reduces the yield of soybean. To cope with salt stress, soybean has developed several tolerance mechanisms, including： （i） maintenance of ion homeostasis; （ii） adjustment in response to osmotic stress; （iii） restoration of osmotic balance; and （iv） other metabolic and structural adaptations. The regulatory network for abiotic stress responses in higher plants has been studied extensively in model plants such as Arabidopsis thaliana. Some homologous components involved in salt stress responses have been identified in soybean. In this review, we tried to integrate the relevant works on soybean and proposes a working model to describe its salt stress responses at the molecular level.
