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Inheritance of pseudo-self compatibility in self-incompatible garden and greenhouse chrysanthemums, Dendranthema grandiflora Tzvelv

Anderson, N.O. (Minnesota Univ., St. Paul, MN (USA). Dept. of Horticultural Science) ; Ascher, P.D

Euphytica, 1996, Vol.87 (2), p.153-164 [Periódico revisado por pares]

Dordrecht: Springer

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  • Título:
    Inheritance of pseudo-self compatibility in self-incompatible garden and greenhouse chrysanthemums, Dendranthema grandiflora Tzvelv
  • Autor: Anderson, N.O. (Minnesota Univ., St. Paul, MN (USA). Dept. of Horticultural Science) ; Ascher, P.D
  • Assuntos: Agronomy. Soil science and plant productions ; AUTOCOMPATIBILIDAD ; AUTOCOMPATIBILITE ; AUTOESTERILIDAD ; AUTOSTERILITE ; Biological and medical sciences ; DENDRANTHEMA MORIFOLIUM ; ENDOGAMIA ; Fundamental and applied biological sciences. Psychology ; GENETIC INHERITANCE ; Genetics and breeding of economic plants ; HEREDITE ; HERENCIA GENETICA ; Heterosis. Floral biology applications: apomixy, male sterility, incompatibility, varia ; INBREEDING ; Plant breeding: fundamental aspects and methodology ; SELF COMPATIBILITY ; SELF STERILITY
  • É parte de: Euphytica, 1996, Vol.87 (2), p.153-164
  • Notas: F30
    F63
    9601507
    ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: Self incompatibility (SI) can be used to alleviate costly hand emasculation and pollination in F sub(1) hybrid chrysanthemum seed production. SI, however, disrupts the progression of inbreeding (selfing or full-sib mating). Consequently, inbreds are selected for breakdown of the SI system or the presence of pseudo-self compatibility (PSC). PSC inbreds, recombinant inbreds, and noninbred cultivars were selfed and/or intercrossed to determine PSC expression across environments and generate 1-3 inbred generations (I sub(1)-I sub(3)). Percent PSC ranged from 0-68.8% for inbred parents, 0.2-99.7% for recombinant inbreds, and 0.6-25.7% for noninbred cultivars. There was no indication of 'end-of-season' PSC. The majority of parents (78%) were classified as low PSC and this trend continued in the I sub(1) (70.1%), I sub(2) (65.6%), and I sub(3) (83.6%) generations; mid PSC was rarer (11.9-18.8%) and high PSC the least common (4.5-15.6%). PSC distributions were primarily continuous, rather than discrete, indicating quantitative inheritance. In several inbred families, 100% of the I sub(1) individuals were SI; this was not correlated with parental PSC level. Inbred families derived from selfing low and mid PSC parents were the most likely to reach extinction due to inbreeding depression. High PSC was not highly heritable, since I sub(1) progeny were predominantly SI or had low to mid PSC levels. Most chi sub(2) values for PSC:SI segregations (1:1, 1:3, 3:1) were not significant at the 5% level. Realized heritability (H sub(R)) estimates for PSC ranged from a low of 0.05% to 10.19%, although increased H sub(R) values did not account for inbreeding depression or genetic mechanisms preventing selection for high PSC. The highest individual %PSC increased over the high parent with SI x low PSC or SI x mid PSC parents in all cases; progeny means did so only in SI x low PSC. Low x low crosses were split evenly between an increase and decrease in progeny or highest individual mean. Since all low x low crosses and low selfs produced 43-50% of the progeny with PSC levels higher than the parents, it appears that most low parents possess some unexpressed PSC genes. Mid PSC parents responded similarly to low PSC genotypes. An increase in PSC was found when crossing SI x PSC parents, illustrating a 'threshold effect'. PSC x PSC crosses (high x low, low x low) produced SI, low, and mid PSC I sub(1) individuals but did not show a heterotic effect, since the PSC parents had already surpassed the PSC threshold. Selfing high PSC parents, however, suggested different genetic control. Progeny and highest individual means behaved the same; 83% decreased and 17% remained the same for PSC levels. The drop in PSC indicated non-additive gene action. Thus, the PSC threshold with additive gene action holds when selection for higher PSC levels is being done from low and mid PSC parents, but once high PSC levels are obtained, non-additive gene action prevails.
  • Editor: Dordrecht: Springer
  • Idioma: Inglês
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