论文部分内容阅读
1 混杂退化原因 1.1 天然杂交:辣椒为常异交作物,自然杂交率约10%以上,在开花授粉期,由于昆虫的传粉而发生天然杂交。一般情况下,一块地不会种植一个品种,可能会种植多个品种,这样就很容易引起天然杂交,产生大量品种间杂交种子,杂交种子不稳定,变异性大,导致良种分离退化。 1.2 机械混杂:辣椒从播种、育苗、移栽、定植到采收、晾晒等过程中,由于工作程序多,这样也容易使不同品种间的种子相互混杂,使良种的纯度
A mixed degeneration causes 1.1 natural hybrid: pepper is often outcrops, the natural hybrid rate of about 10% or more, in the flowering and pollination period, due to insect pollination and natural hybridization occurred. Under normal circumstances, a piece of land will not be planted a variety of varieties may be planted, it is easy to cause natural hybridization, resulting in a large number of hybrid seeds between varieties, hybrid seeds instability, variability, resulting in the separation and degradation of elite. 1.2 mechanical hybrid: pepper from sowing, nursery, transplanting, planting to harvesting, drying and other processes, due to many procedures, it is also easy to make the seeds of different varieties mixed with each other, so that the purity of varieties