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连续开花(Perpetual blooming,PB)是观赏植物的重要性状之一,是中国月季对现代月季的重大贡献。然而月季连续开花性状的遗传基础至今尚未清晰。为研究中国古老月季品种‘月月粉’(Rosa chinensis‘Old Blush’,用OB表示)连续开花习性的遗传规律,以其为母本,以一季开花(Single seasonal blooming,SB)园艺品种‘无刺光叶蔷薇’(Rosa wichuriana’Basye’s Thornless’,用W表示)为父本,构建了OB、W、F_1、F_2、BC_1OB和BC_1W等6个世代827个株系的二倍体遗传分离群体。遗传分离群体表型测定将开花表型分为连续开花和非连续开花(Non-perpetual blooming)2种类型。296株F_1和150株BC_1W群体均表现为非连续开花,表明OB连续开花性状受隐性基因位点调控。300株BC_1OB群体中83株为连续开花,223株为非连续开花,χ~2适合性测验符合1:3的遗传分离规律(P<0.05),表现为双隐性基因遗传,表明‘月月粉’连续开花可能受双隐性基因位点共同调控。
Perpetual blooming (PB) is one of the important traits of ornamentals and is a significant contribution of Chinese rose to modern rose. However, the genetic basis of the continuous flowering traits of rose is not clear yet. In order to study the genetic regularity of the continuous flowering habits of the Chinese Rosa chinensis’ Old Blush ’(OB), we used it as the female parent and used a single seasonal blooming (SB) horticultural variety’ N The diploid genetic segregation population of 827 lines of OB, W, F_1, F_2, BC_1OB and BC_1W were constructed using Rosa wichuriana ’Basye’s Thornless’ as the male parent. Genetic segregation population phenotyping divides the flowering phenotype into two types: continuous flowering and non-perpetual flowering. 296 F_1 and 150 BC_1W populations showed non-continuous flowering, indicating that continuous flowering trait of OB was regulated by recessive gene loci. Among 300 BC1OB populations, 83 were continuous flowering and 223 were non-continuous flowering. The χ ~ 2 fitness test was in accordance with the rule of 1: 3 genetic segregation (P <0.05) and showed double recessive gene inheritance, indicating that ’month Continuous flowering of powder may be regulated by double recessive loci.