不同组合杂种小麦群体光合优势特点的研究

Research on the Characters of Heterosis of Population Photos ynthesis in Different Wheat Hybrids

为明确群体水平上化杀型杂种小麦的光合优势表现特征及其生理机制 ,以 2个化杀型小麦杂种F1及其亲本为材料 ,推广品种冀麦 38号为对照进行了研究。结果表明 :供试杂种小麦 1F1和 2F1的群体干物质生产能力都表现平均优势和超标优势。 1F1起因于其LAI和光合势优势较大 ,2F1则是由于净同化率优势较大。 1F1和 2F1的子粒产量都高于亲本和对照 ,与亲本相比 ,1F1和 2F1的产量优势是由产量构成三因素综合提高所致 ,与ck相比 。

To clarify the characteristics of population photosynthesis of CHA wheat hybrids and their physiological basis, a study was conducted with two CHA wheat hybrid F1 as tested materials and Jimai 38 as control. The main resul ts showed that, there were obvious average heterosis (AH) and super control het erosis (SH) on the population dry weight in two CHA wheat hybrids 1F 1and 2F 1 , but the heterosis of 1F 1 mainly came from the heterosis of LAI and photosynt hetic potential, while the heterosis of 2F 1 came from that of net assimilation rate. The grain yields of 1F 1 and 2F 1 obviously surpassed their parents and ck. Compared to their own parents, the heterosis of 1F 1 and 2F 1were caused by the increase of all the three yield components,but their SH of yield mainly c ame from the increase of kernel weight.