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以先玉335和郑单958及其亲本为材料,设不追氮和追氮150 kg/hm~2两个氮处理,研究玉米单交种光合生产能力杂种优势与产量杂种优势的关系及其对氮肥的响应。不追氮条件下,玉米单交种产量杂种优势主要来源于干物质积累量和LAI的杂种优势,叶片光合特性Pn、Gs、Ci和Tr均未表现出杂种优势。追氮150 kg/hm~2条件下,产量杂种优势显著提高,较不追氮高36.6%;除干物质积累量和LAI等群体数量性状仍具有杂种优势外,叶片光合特性Pn、Gs、Tr和SPAD值等个体功能性状也表现出明显的杂种优势。施氮条件下,干物质积累量和LAI的杂种优势没有提高,Pn、Gs、Tr和SPAD值的杂种优势分别较不追氮提高35.8%、55.3%、50.9%和19.6%。施氮条件下玉米单交种产量杂种优势的提高主要来源于叶片光合特性杂种优势的提高,与干物质积累量和LAI的杂种优势无关。
Taking Xianxian 335 and Zhengdan 958 and their parents as materials, the effects of nitrogen uptake and nitrogen uptake of 150 kg / hm ~ 2 on the heterosis of photosynthetic ability and heterosis of yield were studied. Response to nitrogenous fertilizer. Under the condition of not chasing nitrogen, the yield heterosis of maize cross was mainly derived from the dry matter accumulation and the heterosis of LAI. The photosynthetic characteristics of leaves did not show the heterosis of Pn, Gs, Ci and Tr. Under the conditions of 150 kg / hm ~ 2 nitrogen uptake, the heterosis of yield increased significantly, which was 36.6% higher than that of no nitrogen application. Except for dry matter accumulation and LAI, the population traits still had heterosis. The photosynthetic characteristics of Pn, Gs, Tr And SPAD value and other individual functional traits also showed obvious heterosis. Under nitrogen application, the dry matter accumulation and LAI heterosis did not increase, and the heterosis of Pn, Gs, Tr and SPAD increased by 35.8%, 55.3%, 50.9% and 19.6%, respectively. The improvement of heterosis in single cross hybrid maize yield was mainly attributed to the improvement of heterosis of photosynthetic characteristics under nitrogen application, which had nothing to do with the dry matter accumulation and the heterosis of LAI.