摘要： 研究表明，玉米植株叶片间的叶绿素含量（a+b，a、b，a/b值）变化有明显的区别。基部第一叶，叶绿素含量高峰出现早，维持时间短，呈单峰曲线变化；其余叶片为双峰曲线或多峰曲线变化。随叶位的升高而出现高峰期推迟，顶住叶稍晚；中上位叶最晚。全株叶片中，以17叶（穗位上1-2叶）含量最高，其次为以穗位叶为中心的中上位叶。全株叶片在不同生育期间叶绿素含量的变化，以子粒灌浆高峰始期为最高，在此以前又在展2-3叶期，雄穗生长锥伸长--裂片期；雄穗小花分化--四分体期，抽雄--雌穗叶丝期，出现4个峰期。与叶片干物质积累输出动态有相应的变化。不同序位叶片叶绿素含量以上位叶>；中位叶>；下位叶，而a/b值则以下位叶>上位叶>中位叶。

关键词: 夏玉米, 叶绿素含量

Abstract: The chlorophyll contents in individual leaf blades were studied from 1980 to 1982.The main results are described here in this paper.The chlorophyll contents(a+b,a/b)differed markedly among leaf blades.The change of the contents in the first leaf blade showed a short,early,and acute mono-peaked curve,while the contents in other leaf blades showed double-or poly-peaked curves.In general,the higher the leaf,the later the peak of chlorophyll contents would appear except the last leaf,During the whole growth period,the chlorophyll contents in the leaf blades showed five peaks,i.e.from the emergence of the second leaf to that of the third leaf,from tassel apex elongation to vertical section formation,from floret formation to tetrad formation,from tassel emergence to silking,and from the beginning of the filling stage to its peak period.This trend changed with dry matter content in leaf blades.

Key words: Summer maize, Chlorophyll content