谷类作物的营养生长包括叶原基(发育成叶)和腋芽原基(发育成分蘖)的形成及其随后的生长。小麦为有限生长植物,仅在幼穗分化前形成的叶原基才能发育成为叶。虽然叶腋中一般都能产生腋芽,然而并非都能形成分蘖。因为有效分蘖是构成产量的一个重要因素,故有必要研究环境条件和遗传因素对分蘖 Vegetative growth of cereals includes the formation of leaf primordia (developmental lobe) and axillary bud primordia (developmental tillers) and their subsequent growth. Wheat is a limited-growth plant, and leaf primordia formed only before spike differentiation can develop into leaves. Although axillary buds are generally produced in leaf axils, not all of them can form tillers. Because effective tillering is an important factor in yield formation, it is necessary to study the effects of environmental conditions and genetic factors on tillering