人们经常重视的是半矮秆小麦收获指数高(McNeal等,1972)的优点。然而,对这种优点的生理基础则很少研究。半矮秆小麦把较多的光合产物分配给大穗的生产,可能是由于茎需要的碳水化合物比高秆小麦的少(Syme,1969)。对氮来说,可能也存在同样的情况,尽管大多数的籽粒氮是从营养部分转移过去的(Halloran,1981)。 Often the emphasis is on the advantages of high semi-dwarf wheat harvest index (McNeal et al., 1972). However, the physiological basis for this advantage is rarely studied. Semi-dwarf wheat allocates more photosynthate to the production of larger ears, probably because stems require less carbohydrate than high-stalk wheat (Syme, 1969). The same can be true for nitrogen, although most of the grain nitrogen is transferred from the nutrient (Halloran, 1981).