摘要
[Objective] The aim was to improve the genetic property of peppers, the mutant population of Capsicum annuum L cultivar ＂6421＂ was constructed. [Method] The seeds of ＂6421＂ were treated with 0.2% to 1.2% ethyl methane sulfonate to identified LD50, and then 10 000 LD^o of treated seeds were sowed to construct mutant population. The agronomic characters and genetic regularity of dwarf mutants in M4 generation were analyzed. [Result] Our results showed that GR and SSR were 45.2% and 40.2% respectively at 1.0% EMS, close to LD50, with GI （17.6） and seed Ⅵ （19.7） being half of that of control; 562 M4 mutants were identified in 2015, and the mutation could be characterized according 11 major categories and 32 subcategories; Simultaneously, we found that plant height, plant width, diameter of mainstem, length of main-stem, the number of main-stem nodes and branch of lines E29, E58, E142 and E312 were all significantly different from that of the control. The mutation of lines E29, E58 and E312 was all controlled by a single recessive gene. [Conclusionl The study first created a pepper mutant population, which provides not only the germplasm resources for further breeding but also direct and effective materials for genomic study of the pepper.
[目的]为促进辣椒的遗传改良,以"6421"为试验材料,建立辣椒突变体库。[方法]采用不同浓度的EMS溶液(0.2%~1.2%)处理"6421"种子,确定半致死剂量,并构建突变体,并对M4代中获得的矮秆突变体进行农艺性状调查与遗传分析。[结果]EMS浓度为1.0%时,种子发芽率和出苗率分别为45.2%和40.2%,种子发芽指数和生活力分别为17.6和19.7,接近半致死;取经半致死浓度处理的种子10,000粒构建突变体,2015年在M_4代中共获得562份能稳定遗传的突变体,突变性状可分为11大类32小类;矮秆突变体E29,E58,E142和E312的株高、株幅、主茎粗、主茎长以及主茎节位数均显著低于对照植株,E58侧枝数显著高于对照植株;E29,E58和E312突变性状均由单隐性基因控制。[结论]该研究首次成功地构建了辣椒突变体库,不仅为辣椒育种提供了丰富的种质资源,还为开展辣椒基因组学研究提供了有用的试验材料。
基金
Supported by Natural Science Foundation of Hunan(2016JJ6064)
China Agriculture Research System(CARS-25-A-8)~~
