BMR基因型高粱不育系主要农艺性状的配合力效应

采用NCⅡ不完全双列杂交试验设计,以19份BMR基因型高粱(Sorghum bicolor)不育系为母本,以3份BMR基因型苏丹草(Sorghum sudanense)为父本,从7个主要农艺性状上分析了57个F1杂交组合的配合力和遗传力。结果表明,株高、主茎叶片数、中部叶片长度、中部叶片宽度4个农艺性状具有正向中亲优势;株高、中部叶片长度2个性状具有正向超亲优势;主茎叶片数、叶片中部长度、叶片中部宽度3个性状具有正向竞争优势;而单株分蘖数、主茎直径、主茎穗长均表现为负向优势。各组合的主要农艺性状区组间差异均不显著(P0.05),组合间呈极显著差异(P0.01)。主茎直径、主茎穗长的遗传受基因的加性和非加性效应共同作用,株高、单株分蘖数、主茎叶片数、中部叶片长度、中部叶片宽度的遗传受基因的非加性影响较大;主茎穗长宜在早代选择,而株高、单株分蘖数、主茎叶片数、主茎直径、中部叶片长度5个指标宜在高代选择。综合得出,BMR基因型高粱不育系以AMP454、AMP19、T98A的一般配合力较高,筛选出配合力较高的杂交组合为AMP19×ZS-102和AMP454×ZS-102。

Analysis of the combining ability of the main agronomic traits in brown midrib genotype sorghum sterile lines

A field experiment was conducted to analyze the heritability and combining ability of the 7 main agro-nomic traits from 5 7 hybridized combinations of brown midrib(BMR)sorghum sterile lines using NCⅡ incom-plete diallel cross design.A total of 1 9 BMR Sorghum sterile lines and 3 BMR sudan grass lines with independ-ent breeding were used as female and male parents,respectively.The results showed that four agronomic inde-xes(plant height,leaf number,middle leaf length,and middle leaf width)had mid parent heterosis.Plant height and middle leaf length showed high parent heterosis;leaf number,middle leaf length,and middle leaf width expressed competitive heterosis;whereas tiller number,stem diameter,and panicle length showed nega-tive heterosis.There were no significant differences in the blocks among the main agronomic traits(P>0.05), yet there was a significant difference in the combination(P<0.01).The stem diameter and main panicle length were controlled by both additive and non-additive effects,whereas non-additive effects were very strong in plant height,leaf number,middle leaf length,and middle leaf width.The main stem length should be selected dur-ing the early stage,whereas the other traits should be selected during the later stages except for the middle leaf width that was affected by environmental conditions.Based on the comprehensive analysis,the general combi-ning ability of BMR sorghum sterile lines AMP454,AMP19,and T98A were relatively high,with the better hybrid combinations being AMP19×ZS-102 and AMP454×ZS-102.