Effects of Different Nitrogen Application Levels on Changes of Sucrose Content in Leaf, Culm, Grain and Photosynthate Distribution and Grain Starch Accumulation of Winter Wheat
Effects of Different Nitrogen Application Levels on Changes of Sucrose Content in Leaf, Culm, Grain and Photosynthate Distribution and Grain Starch Accumulation of Winter Wheat
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发表时间：
2002
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通讯作者：
Jiang Dong
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作者：
Jiang Dong
在池栽条件下，不同施氮水平对冬小麦(Triticum aestivum L.)叶片、茎和籽粒蔗糖含量的影响。CV。以鲁麦22为材料进行了研究。与施氮量210 kg/hm2处理相比，施氮量270~330 kg/hm2显著提高了产量潜力达9000 kg/hm2的鲁麦22旗叶和茎秆中的蔗糖含量。270 kg/hm2氮肥处理比210 kg/hm2氮肥处理花前花后产生的14C光合作用产物多。但贮藏光合作用产物的产量在两个处理间无明显差异。开花后20d，高氮处理的当前光合产物直接转运到籽粒中的比例低于低氮处理。较高氮素处理植株中暂时储存在植物器官中的当前光合作用产物的百分比相应增加。随着施氮量的增加，鲁麦22籽粒中蔗糖含量增加，淀粉积累增加。高氮处理的产量也高于低氮处理。结果表明，光合作用器官产生的当前光合作用产物和植物器官暂时储存的光合作用产物的供应与小麦籽粒淀粉合成密切相关。
In pool culture, effects of different nitrogen application levels on of sucrose content in leaf, culm and grain of winter wheat (Triticum aestivum L.) cv. Lumai 22 was studied. Compared with the treatment of 210 kg/ha nitrogen, treatments of 270～330 kg/ha nitrogen significantly increased sucrose content in flag leaf and culms of Lumai 22, a variety with a yield potential of 9000 kg/ha. The treatment of 270 kg/ha nitrogen stored more 14 C photosynthate produced before and after anthesis than that of 210 kg/ha nitrogen. But the output of stored photosynthate appeared no difference between these two treatments. The percentage of current photosynthate which directly translocated to the grain at 20 days after anthesis is lower in higher nitrogen treament than that of lower nitrogen treatment. The percentage of current photosynthate in the higher nitrogen treatment plant temporally stored in the vegetable organs increased accordingly. The sucrose content in grain of Lumai 22 increased, and starch accumulation enhanced when more nitrogen applied. The yield of higher nitrogen treatment was also higher than the lower nitrogen treatment. The result indicated that the supply of current photosynthate produced by photosynthesizing organs and temporally stored photosynthate in vegetable organs correlated closely to grain starch synthesis of wheat.