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甘薯属于短日照作物,一般在我国南方(北纬23°以南地区)可以自然开花。在北方地区,一般品种则大都不能自然开花。因此,要开展甘薯杂交育种工作,首先就要解决杂交亲本的开花问题。当前广泛采用促进甘薯开花的主要方法是“重复法”,即对不能自然开花的材料先嫁接在牵牛等旋花科近缘植物上,并结合进行短日照处理以促使开花。一般短日照处理时间需经20～50余天。重复法除对少数很难开花的材料而外,一般可以获得较好的效果。然而这种方法费时费工,且需暗室,遮光箱等遮光设备。很不利于
Sweet potato is a short-day crop, usually in southern China (latitude 23 ° south of the area) can bloom naturally. In the north, most varieties do not bloom naturally. Therefore, to carry out sweet potato hybrid breeding work, we must first solve the flowering of hybrid parents. The current widely used to promote the flowering of sweet potato is the main method of “repeat method”, that is, not to flowering materials, first grafted on the relatives of Convolvulaceae and other plants, combined with short-day treatment to promote flowering. General short-day processing time by 20 to 50 days. Repetition method except for a few difficult flowering material, the general can get better results. However, this method takes time and effort, and darkroom, shading boxes and other shading equipment. Very detrimental