论文部分内容阅读
本文强调了世界各产烟国近来品种改进的成就,并建成印度发展相似的适合产烟区需要的烤烟品种. 抗病力过去的努力是通过杂交和选育来改进植株形态和增加抗力,然而抗病力是很复杂的.当抗黑胫病的品种的根部被根瘤线虫侵袭后就变为易染黑胫病.在美国抗线虫的NC95在津巴布韦和印度却是易受感染的.另外,一致的或普遍抗病的品种是不存在的.具有抗病力的栽培品种突发病害也是众所周知的.现在成功的品种不会长期保持抗病力;抗病育种应视为不断进行的计划.因而主产烤烟的国家经常育出抗各种病害的品种.诸如下列:
This article highlights the recent improvements in the variety of tobacco-producing countries in the world and the development of flue-cured tobacco varieties in India that are ideally suited to the needs of tobacco-producing areas. In the past efforts to combat disease have been to improve plant morphology and increase resistance through crossbreeding and selection, however The disease resistance is complex and becomes blackleg when the root of the anti-shank species is infected by root-knot nematodes and NC95 is resistant to nematodes in the United States but is susceptible to infection in Zimbabwe and India In addition, Uniform or generally resistant varieties are non-existent, and it is also well-known that disease-resistant varieties of cultivars are devastating, and now successful varieties do not maintain disease resistance over the long term; disease-resistant breeding should be considered as an ongoing program. Countries that produce mainly flue-cured tobacco thus often breed anti-disease varieties such as the following: