共查询到16条相似文献,搜索用时 203 毫秒
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野生稻资源在水稻育种中的利用及展望 总被引:3,自引:0,他引:3
综述近年来人们在野生稻优异性状鉴定方面的最新成果,回顾野生稻在水稻育种中的利用,展示利用野生稻宝贵基因的几种有效可行方法。为野生稻这一宝贵基因源的利用提供一些可借鉴的资料。 相似文献
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二十一世纪水稻育种的思考 总被引:3,自引:0,他引:3
介绍了水稻矮化育种、杂种优势利用和理想株型育种。阐述了21世纪通过挖掘野生稻资源,扩大杂种优势利用的范围,拉大杂交亲本的遗传距离,通过基因工程、生物工程提高光合效率等手段,实现选育水稻高产、优质、抗病、抗逆品种的目标。 相似文献
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Progress on Transferring Elite Genes from Non-AA Genome Wild Rice into Oryza sativa through Interspecific Hybridization 总被引:1,自引:0,他引:1
The progress of research on transferring elite genes from non-AA genome wild rice into Oryza sativa through interspecific hybridization are in three respects, that is, breeding monosomic alien addition lines (MAALs), constructing introgression lines (ILs) and analyzing the heredity of the characters and mapping the related genes. There are serious reproductive barriers, mainly incrossability and hybrid sterility, in the interspecific hybridization of O. sativa with non-AA genome wild rice. These are the ‘bo... 相似文献
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一系法杂交水稻研究的技术策略探讨 总被引:8,自引:1,他引:7
通过一系法利用和固定水稻的远缘杂种优势是一项具有极大诱惑力但难度颇大的科研难题。我国水稻无融合生殖研究尚处在探索性阶段,还没有筛选到具有实用价值的无融合生殖种质。由于多倍体水稻的有性生殖能力明显变弱,在多倍性水平筛选和创造水稻无融合生殖种质有可能成为一系法杂交稻研究的突破口。 相似文献
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陆稻主要经济性状配合力研究 总被引:5,自引:0,他引:5
为有效改良云南陆稻,选用国外半矮秆陆稻良种与云南高秆陆稻配成7×7不完全双列杂交作配合力、遗传力分析。配合力与材料有关,一般配合力(GCA)国外陆稻优于云南陆稻,国外陆稻着重选择有效穗数、结实率,云南陆稻重点选穗粒数。两类品种的特殊配合力(SCA)仅有效穗数、抽穗期、穗粒数达显著或极显著水平。用国外陆稻改良云南陆稻行之有效并得到育种实践证明;总结出低世代重点选株高、抽穗期和组合,高世代选有效穗数、穗粒数、实粒数、结实率和单株的复交、常规育种策略。同时对所用亲本作具体评价,选出一般配合力较好的亲本IRAT216、Tos2300、IRAT104和勐旺谷。就GCA、SCA对不同育种途径的作用、水陆交改良云南陆稻有效穗数的可行性进行了讨论 相似文献
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Crop domestication and thereafter gradual selection or directional breeding have narrowed the genetic diversity of elite varieties and even promoted gathering of deleterious mutations in their stress response mechanisms, whereas local ecotypes, landraces and wild relatives still growing on native environment and preferences keep the genetic diversities for features like stress tolerance. Rayada is such an exceptional ecotype, variant of typical deepwater rice, completely endemic to certain areas of Madhumati river tracts of Bangladesh and still shares some features of wild rices. Multiple physiological features of Rayadas are distinctly different from typical deepwater rice. Tolerance to prolonged flood, submergence and cold are special features along with strong photoperiod sensitivity and lack of dormancy. Moreover, longer root system and prompt recovery capacity make it as an elite resource of stress tolerance. However, it has long been neglected because of mainly its long life cycle and poor yield. This review examines the specialty of Rayada rice and the potential use of its unique traits. 相似文献