玉米雄性不育资源的发掘与利用

植物雄性不育是指植物雄性生殖器官不能产生正常有功能花粉的现象.玉米(Zea mays L.)是重要的粮食作物之一,也是较早利用杂种优势的作物之一.当前,生产上广泛种植的玉米品种类型主要是单交种.我国玉米杂交种的播种面积常年稳定在6.2亿亩左右,年用种量10亿公斤以上,常年制种面积高达250多万亩.利用传统的人工去雄或机...

Exploration and utilization of maize male sterility resources

Male sterility refers to the defective development of male reproductive organs,which led to plants incapable of producing normal and functional pollens.Maize(Zea mays L.)is one of the most important food crops,as well as one of the earliest crops to utilize heterosis in breeding.Single cross hybrid has been the main type of maize heterosis utilization for a long time.The planting area of maize hybrid in China has been stable at about 620 million mu.More than one billion kilograms of commercial hybrid seeds are needed each year,and the annual seed production area has been stable at about 2.5 million mu in recent years.So far,manual emasculation has been the major way of maize hybrid seed production in China,which is laborious and time consuming.Generally,spatial isolation is necessary for maize hybrid seed production,this requirement results in only some regions in the country suitable for maize hybrid seed production.Manual emasculation requires seasonal demand of labors.At present,with the urbanization of a large number of rural laborers,the seed production regions experience a serious labor shortage.Accordingly,the cost of seed production increases with the rising of land rent and labor costs.In addition,it is difficult to guarantee the seed purity with manual or mechanical emasculation for hybrid seed production.However,incorporating male sterility into maize hybrid seed production could reduce its cost and ensure hybrid seed purity.It can also avoid the difficulties of manual or mechanical emasculation in field operation under extreme weather conditions.Therefore,it is the inevitable trend of development in the maize seed industry.In this review,we summarize the exploitation and creation of maize cytoplasmic male sterility(CMS),maize genic male sterility(GMS)resources in China,and the developing process from natural discovery to targeted creation of male sterility resources in plants,and the research progress of maize male sterility.We then analyze the application status and existing problems of maize male sterility,based on the development trend of maize seed industry,as well as the research and application status of male sterility in China.We also identify seven aspects that need to be further strengthen,thereby providing the reference for the creation,research and utilization of maize male sterility in the future.