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谷子是常异文作物,天然杂交率0.014～5.6%.从生物学特性看,谷子是容易形成生物混杂的作物.因此,一个谷子品种在同一个地方种植多年,容易退化,自然形成一个天然杂合的群体.在这样的群体里所选的大穗,一般有三种情况:①由于施肥不均(如粪堆底)造成地力差异,形成单株生长发育不一致产生的大穗:②由于缺株断条或边行优势产生的大穗:③由于谷子的生物混杂,天然杂交,具有杂种优势表现出来的大穗.前两种情况属于环境条件变化而出现的壮株、大穗,但这种变异不能遗传
Millet is often heterogeneous crops, natural hybrid rate of 0.014 ~ 5.6% .By biological characteristics, millet is easy to form biological hybrid crops.Therefore, a millet cultivated in the same place for many years, easy to degenerate, naturally form a natural hybrid In this group of selected large spike, there are three general conditions: ① due to uneven fertilization (such as dung heap) caused by differences in the formation of a single plant growth and development inconsistent large spike: ② due to lack of strains Broken lines or edge of the big spike: ③ due to the hybrid biological millet, natural hybrid, hybrid heterosis showed large spike.The first two cases belong to the changes in environmental conditions, the emergence of strong strains, big spike, but this Variation can not be inherited