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为探明高产玉米群体是否存在叶片冗余现象,根据2007年15000株.hm-2密度下的产量结果,筛选出低密度条件下的冗余类型(超试1号)和非冗余类型(超试3号),2008年将两品种在各自最适密度的高产条件下进行开花期整株剪叶1/2(T1)和1/4(T2)处理,以其地上部干物质积累量和籽粒产量的变化来证实叶片冗余现象的存在;以Richards模型拟合籽粒灌浆过程;以穗位叶光合特征参数和叶绿素荧光参数来评价去除冗余叶片后光合生理特性的变化.结果表明:不同冗余类型的两个玉米品种,在最适密度的高产条件下都存在叶片冗余现象;适当去除玉米群体冗余叶片可以延长植株活跃灌浆时间,有利于获得较高籽粒产量;去除冗余叶片提高了玉米穗位叶净光合速率和光能利用效率.
To find out whether there is leaf redundancy in high-yielding maize population, according to the yield of 15000 plants at the density of -hm-2 in 2007, we screened the redundancy type (Super Test No. 1) and non-redundancy type Super Test 3). In 2008, the two varieties were cut at 1/2 (T1) and 1/4 (T2) of the whole plant at the flowering stage under the high yielding conditions of their optimum density. The aboveground dry matter accumulation And the changes of grain yield to confirm the existence of the leaf redundancy phenomenon.The Richards model was used to fit the grain filling process.The changes of photosynthetic physiological characteristics after removal of redundant leaves were evaluated by photosynthetic parameters and chlorophyll fluorescence parameters of ear position.The results showed that: Two maize varieties with different redundancy types had leaf redundancy under the conditions of the most suitable density and high yield. Appropriate removal of redundant leaves of maize populations could prolong the active grouting time of the plants, which would be beneficial to obtain higher grain yield. Redundant The leaves increased the net photosynthetic rate and light use efficiency of maize leaves.