Genetic Analysis of Plant Height Trait in Pepper with Major Gene Plus Polygene Mixed Model
PANG Xin1，3，GUO Qinwei2，ZHANG Ting2，LIU Huiqin2，LIU Jia3，YU Jiahong3，SONG Qiuping3，
WAN Hongjian3*
1 Horticultural Science and Technology，Suzhou Polytechnic Institute of Agriculture，Suzhou 215008，Jiangsu，China；2Quzhou Institute of Agricultural and Forestry Sciences，Quzhou 324003，Zhejiang，China；3 State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products，Institute of Vegetables，Zhejiang Academy of Agricultural Sciences，Hangzhou 310021，Zhejiang，China
Abstract：Plant height is one of the important agronomic characters in pepper，which directly affects lodging resistance and yield．To explore the genetic characteristics on plant height in pepper，a dwarf inbred line‘ B1-2’ was crossed a tall inbred line‘ D50’，and the major gene plus polygene mixed genetic model was carried out to conduct a genetic analysis for 6 generations（P1，P2，F1，B1，B2 and F2）．The results indicated that the most suitable genetic model of pepper plant height is E-1（two pairs of additive-dominantepistatic major genes + additive-dominant polygenes）． Additive effect values of the two pairs of major genes of plant height were both 3.408 7，and the dominant effect values were 1.369 8 and -0.734 6，respectively．The inheritability of major genes was 34.18%，67.48%，66.45% in B1，B2 and F2，and the inheritability of polygene was 46.84%，12.85% and 21.99%，respectively．In this study，the plant height was genetically controlled jointly by major genes and polygenes，and the environment showed little effect．
