摘要
This study was conducted to investigate the genetic regularity of indexes related to freshness keeping and its molecular basis by acquiring 6 generations （P1, P2, F1, B1, B2 and F2） of an inbred line T3 with long freshness period × an inbred line T15 with short freshness period in sweet corn. The genetic analysis of the indexes was performed by major gene＋polygene mixed genetic model combined with the genetic analysis combining six generations.The results showed that the decreasing rate of the postharvest sugar content in the T3 was controlled by two pairs of additive-dominante-epistatic major genes＋additive-dominant polygenes; each segregating generation was affected by its major genes, the heritability of major genes and polygene in the B1 generation was 74.63% and 17.67%, respectively; the heritability of major gene and potygene in the B2 was 91.98% and 0,00%, respectively; and the heritability of major gene and polygene inthe F2 was 82.67%, and 12.93%, respectively.
采用长保鲜期甜玉米自交系T_3和短保鲜期自交系T_(15)为亲本,配制T_3×T_(15)组合的6个世代(P_1、P_2、F_1、B_1、B_2和F_2),用"主基因+多基因混合遗传模型"结合六世代联合遗传分析的方法对甜玉米保鲜相关性状进行遗传分析,研究甜玉米保鲜相关指标的遗传规律及其分子基础。结果表明,甜玉米自交系T_3的采后含糖量下降速率受2对加性-显性-上位性主基因+加性-显性多基因控制;各分离世代以主基因遗传为主,回交世代B_1的主基因遗传率为74.63%,多基因遗传率为17.67%;B_2的主基因遗传率为91.98%,多基因遗传率为0%;F_2的主基因遗传率为82.67%,多基因遗传率为12.93%。
基金
广东省科技计划项目(2012B020301006)~~
