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Research on the inheritance of seed dormancy in lettuce (Lactuca sativa L.) and selection for non-dormancy

, : Research on the inheritance of seed dormancy in lettuce (Lactuca sativa L.) and selection for non-dormancy. Euphytica 30(2): 371-380

Inheritance of dormancy and the results of selection of non-dormant genotypes in segregating populations of lettuce were investigated. Diallel crosses were therefore carried out between 2 dormant (DOR) and 2 non-dormant (NDOR) cultivars. F1, F2 and F3 populations were analyzed. Environmental variation for dormancy usually was large. The mean germination time (GT) of F1 seeds from the NDOR .**GRAPHIC**. DOR crosses was often intermediate to the GT of the NDOR and DOR parent. The mean GT of F1 seeds from DOR .**GRAPHIC**. DOR crosses equalled the mean GT of the parents; the same applies for the NDOR .**GRAPHIC**. NDOR crosses. No differences between reciprocals were observed and neither were such differences found for F2 populations. F2 populations from DOR .**GRAPHIC**. DOR crosses showed no significant segregation of rapidly germinating seeds and in F2 populations from NDOR .**GRAPHIC**. NDOR crosses no accumulation of genes for long GT occurred. In F2 populations from NDOR .**GRAPHIC**. DOR crosses usually 40-60% of the seeds germinated as rapidly as the seeds of the NDOR parents. Only 1 gene (D) could be responsible for the difference in dormancy behavior of the DOR and NDOR cultivars. The behavior of the F3 lines from various NDOR .**GRAPHIC**. DOR crosses supports this hypothesis. A regression of F3 means on the value of F2 seeds for GT of various NDOR .**GRAPHIC**. DOR crosses showed that h2[heritability]-narrow usually was rather high for most crosses implying that selection for non-dormancy can be carried out in F2 populations.


DOI: 10.1007/bf00033999

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