玉米“昌7-2”遗传改良系及其组配杂交种的耐密性分析

Study on Density-Tolerance of Improved Lines of Chang 7-2 and Its Hybrids

采用裂区试验设计,密度为主区,品种为副区。在3.0,4.5,6.0,7.5,9.0,10.5万株/hm26个密度下,对昌7-2及其4个遗传改良系和郑单958及4个Reid×塘四平头模式杂交种进行耐密性分析。结果表明:昌7-2和4个遗传改良系中,昌7-53(NC7-53=8.99)和昌7-2(NC7-2=7.82)的耐密性较好,昌7-40(NC7-40=6.45)及昌7-60(NC7-60=4.44)耐密性一般,昌7-83(NC7-83=2.50)的耐密性最差;郑单958及4个Reid×塘四平头强优势模式杂交种中,吉农玉5853(NJNY5853=9.79)和郑单958(NZD958=8.38)的耐密性较好,吉农玉5840(NJNY5840=6.21)耐密性一般,吉农玉5860(NJNY5860=5.55)和吉农玉5883(NJNY5883=5.05)的耐密性较差。昌7-53是改良较成功的自交系,并且由其组配的吉农玉5853具有耐密植的潜力。

In this study, split-plot experimental design was used, density-based districts were main districts, and inbred lines and variety-based districts were deputy districts. Under 3.0, 4.5, 6.0, 7.5, 9.0, 10. 5x 104 plants/hm2, density tolerance of chang 7-2,its 4 genetically improved lines, and zhengdan 958 and 4 Reid× tangsipingtou pattern hybrids was analyzed. Results showed that a- mong chang 7-2 and its 4 genetically improved lines, chang 7-53（Nc7_53 = 8.99） and chang 7-2 （Nc7-2 = 7.82） have better density tolerance, chang 7-40（ Nc7_40 = 6.45） and chang 7-60（ Nc7_60 = 4.44） have ordinary density tolerance, and chang 7-83 （Nc7-83 = 2.50） has the worst density toler- ance; Zhengdan 958 and 4 hybrids according to strong heterosis of Ried x tangsipingtou pattern showed that jinongyu 5853 （ NjNys853 = 9.79） and zhengdan 958 （ NZD95s = 8.38 ） have better density tolerance, jinongyu 5840 （NjNY5840 = 6.21 ） has ordinary density tolerance, jinongyu 5860 （ NjNv5860 = 5.55 ） and jinongyu 5883 （ NjNyss83 = 5.05 ） have worse density tolerance. Chang 7-53 is a successful- ly improved inbred line and its hybrid jinongyu 5853 has the potential for density resistance.