摘要： 紧凑型玉米各叶片长度在茎杆上的空间分布呈近似纺锤型,叶角度较平展型小,叶向值也大,其受光姿态优于平展型.紧凑型米玉对CO₂同化强度、根系吸收强度比平展型大;硝酸还原酶活性比平展型高.紧凑型玉米具有体内氮素代谢旺盛,后期不早衰,籽粒灌浆快,粒重高,单株生产力大和适宜密植等优点.选育和推广高光效紧凑型玉米杂交种是今后玉米高产的主要途径.

关键词: 紧凑型玉米, 株形, 叶向值, 单株生产力

Abstract: The length and spatial distribution of leaves of the compact-type maize on the stem forms the shape of a "spindle". In comparison with the spread-type maize, the compact-type has a smaller leaf angle, greater leaf orientation value, better light-reception posture, higher rate of CO2 assimilation, stronger root absorption intensity, and higher activity of the nitrate reductase. It also has the following advantages, vigorous nitrogen metabolism, no early senescence in the later growing stage, fast grain-filling rates, high grain weight, high productivity per plant, and suitability for intensive planting.Selection and extension of the compact-type maize hybrids possessing high photosynthetic efficiency will be the main approach to the higher production of maize.

Key words: Compact-type maize, Plant shape, Leaf orientation value, Productivity per plant