不同玉米品种在小穗分化期和抽雄期对高温胁迫的响应差异

Response of Maize Cultivars to High Temperature Stress at Spikelet Differentiation Stage and Tasseling Stage

为筛选山东省耐高温胁迫丰产夏玉米品种,以‘郑单958’为对照,在2017年7月10—15日(小穗分化期)和8月2—5日(抽雄期)连续高温热害下分析42个夏玉米品种间产量差异。以产量及其主要性状、兼顾穗位系数为综合评价指标。与对照相比,‘明科玉77’行粒数最大,产量最高,穗位系数比对照低13.04%‘,大京九6号’产量大,但是穗位系数和空杆率均较大‘。德发5号’‘,青农11’‘,正大12’‘,裕丰303’‘,金海13’‘,裕丰105’产量比对照高,并且穗位系数小于对照。通过聚类分析和综合评价,筛选出7个耐高温低穗位系数品种,即‘明科玉77’,‘德发5号’,‘青农11’,‘正大12’,‘裕丰303’,‘金海13’,‘裕丰105’。

To select summer maize varieties with high-temperature stress tolerance and high yield in Shandong Province,‘Zhengdan 958’was taken as the control,and the yield difference of 42 summer maize varieties under high-temperature damage was analyzed from July 10 to 15(the spikelet differentiation stage)and from August 2 to 5(the tasseling stage)in 2017.The yield,the main traits of yield and the ear position coefficient were used as the comprehensive evaluation indexes.Compared with the control,‘mingkeyu 77’had the biggest kernel number per row and the highest yield,its ear position coefficient was 13.04%lower than that of the control.The yield of‘Dajingjiu6 hao’was high,but its ear position coefficient and empty bar rate were high.‘Defa5 hao’,‘Qingnong 11’,‘Zhengda 12’,‘Yufeng 303’,‘Jinhai 13’,and‘Yufeng 105’all had higher yield and lower ear height coefficient,compared with the control.Through the cluster analysis and comprehensive evaluation,seven high-temperature resistant and lower-ear position coefficient maize varieties are selected,which are‘Mingkeyu 77’,‘Defa 5 hao’,‘Qingnong 11’,‘Zhengda 12’,‘Yufeng 303’,‘Jinhai 13’,‘Yufeng 105’.