[关键词]
[摘要]
对不同密度条件下3个不同株型春玉米的光合特性及产量进行了研究。结果表明,随密度增加叶面积指数(LAI)、初始荧光(F0)上升,单株功能叶片光合速率(Pn)、PSⅡ的潜在活性(Fv /F0)、PSⅡ最大光化学量子产量(Fv /Fm)下降;产量构成因素表现为单位面积有效穗数先上升后下降,穗粒数下降,百粒重变化因品种而异。先玉335、金玉4号和吉农大302最高产量分别为9 638.45、8 523.94、8 330.92 kg/hm2;先玉335最适播种密度为75 000株/hm2,吉农大302为60 000~67 500株/hm2,金玉4号为45 000株/hm2。先玉335群体产量与LAI、单株F0呈正相关,与单株Pn、Fv /Fm、Fv /F0呈负相关;吉农大302与金玉4号群体产量与LAI、单株F0呈负相关,与单株Pn、Fv /Fm、Fv /F0呈正相关,且金玉4号的相关程度要高于吉农大302。
[Key word]
[Abstract]
Under different density conditions, it was studied that the photosynthesis characteristics and yield of three plant types spring corn. The results showed that with the density increased, LAI and Fo were to rise, Pn, Fv /F0 and Fm /Fv were to decline. With the density increasing, effective ear of unit area fall after raise, Kernel number per ear was to decline, 100-grain weight changed for varieties. The max yield of XY335, JY4, JND302 were 9 638.45, 8 523.94, 8 330.92 kg/ha. The optimal density of XY335 was 75 000 plants/ha, JND302 was 60 000 - 67 500 plants/ha, JY4 was 45 000 plants/ha. There was a positive correlation between the yield of XY335 and LAI, F0 . At the same time, there was a negative correlation between the yield of XY335 and Pn、Fv /Fm、Fv /F0 . The correlation of photosynthesis characters with yield of JND302 and JY4 were opposite with XY335, and the level of JY4 was higher than JND302.
[中图分类号]
[基金项目]
国家科技支撑计划(2006BAD02A11)、黑龙江省攻关项目(GA07B101A8)