青花菜新品种湘绿2号、湘绿3号光合特性比较

摘要

The new broccoli cultivars,Xianglv No.2 and Xianglv No.3,were taken as materials and broccoli cultivar Shenglv was taken as control to compare the photosynthetic characteristics among the three broccoli cultivars.The results indicated that the leaf photosynthetic rate showed a positive correlation with yield of broccoli,namely the yield of broccoli was high when leaf photosynthetic rate was high without midday depression.The Xianglv No.3 had the highest activity of nitrate reductase,relatively high photosynthetic efficiency and yield,but its fertilizer tolerance was weak.The Xianglv No.2 had the lowest activity of nitrate reductase,the highest photosynthetic efficiency and yield,its fertilizer tolerance was also strong.The assimilation ability of broccoli to nitrate nitrogen was strong in Xianglv No.3 and weak in Xianglv No.2.The Xianglv No.2 could be extended because its yield is the highest,and it is a crop with high photosynthetic efficiency.%以青花菜新品种湘绿2号、湘绿3号为材料,以青花菜圣绿品种为对照,比较了3种青花菜品种的光合特性.结果表明:青花菜叶片的光合速率与产量呈正相关,叶片光合速率高,其产量也高,且没有午休现象.湘绿3号硝酸还原酶活性最高,光合效率也比较高,产量较高,耐肥性弱;湘绿2号硝酸还原酶活性最低,光合效率最高,产量也最高,耐肥性强.湘绿3号对硝态氮的吸收同化能力强,湘绿2号对硝态氮的吸收同化能力弱.湘绿2号产量最高,是高光效的作物,可以推广种植.