夏播“京早7号”玉米叶片叶绿素含量消长规律的研究

STUDIES ON THE CHANGING RULE OF CHLOROPHYLL CON-TENTS IN INDIVIDUAL LEAF BLADES OF SUMMER MAIZE JING - ZAO

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.

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 .