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为探求桃光合性能的遗传规律,以6个桃品种及其组配的8个杂交组合幼苗(F1)群体为试材,对其光合、荧光性状的杂种优势及亲子遗传相关进行了分析。结果表明,绝大多数组合叶绿素含量、类胡萝卜素含量、水分利用效率(WUE)、CO2补偿点(CCP)和PSⅡ实际光化学效率(Yield)以正向中亲、超亲优势为主;净光合速率(Pn)、光补偿点(LCP)、光饱和点(LSP)、饱和光强净光合速率(LSPn)、表观量子效率(AQY)、CO2饱和点(CSP)、CO2饱和净光合速率(CSPn)、羧化效率(CE)、表观电子传递速率(ETR)、PSⅡ最大光化学效率(Fv/Fm)和非光化学淬灭系数(NPQ)以负向中亲、超亲优势为主;亲子相关分析表明,除CSP和Fv/Fm外,各性状F1值与父、母本,高、低亲值,中亲值和双亲差值相关性不大;类胡萝卜素含量、Pn、LSP、LSPn、CCP、CSP、CSPn和初始荧光(Fo)杂种优势大小与双亲差值显著或极显著负相关。在利用桃光合优势育种时应根据育种目标在亲本选配时选择差异适当的双亲。
In order to explore the genetic law of peach photosynthesis, six peach cultivars and eight F1 hybrids were used as materials to analyze their heterosis and parent-offspring genetic relationship. The results showed that most combinations of chlorophyll content, carotenoid content, water use efficiency (WUE), CO2 compensation point (CCP) and PSII actual photochemical efficiency (Yield) (Pn), LCP, LSP, LSPn, AQY, CSP, and net photosynthetic rate of CO2 saturation ( CSPn, CE, ETR, Fv / Fm and non-photochemical quenching coefficient (NPQ) were mainly negative pro- Correlation analysis showed that there were no significant correlations between the F1 values of the traits and those of the parents, the parents, the high, the low, the medium and the parents, except for CSP and Fv / Fm. The contents of carotenoids, Pn, LSP and LSPn , CCP, CSP, CSPn and initial fluorescence (Fo) heterosis were significantly or extremely significantly negatively correlated with the difference of parents. In the use of peach photosynthetic dominant breeding should be based on breeding objectives in the parental selection of the appropriate choice of parents.