Jatropha curcas L. (Euphorbiaceae) exhibits a mixed mating system, high correlated mating and apomixis

Autor(es)

Bressan, Eduardo Andrade ^[1] ; Sebbenn, Alexandre Magno ^[2] ; Ferreira, Renato Rodrigues ^[1] ; Gerald Lee, Tseng Sheng ^[3] ; Figueira, Antonio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Energia Nucl Agr, Sao Paulo - Brazil

^[2] Inst Florestal Sao Paulo, Secao Melhoramento & Conservacao Genet Florestal, Sao Paulo - Brazil

^[3] Univ Fed Sao Carlos, Ctr Ciencias Agr, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Tree Genetics & Genomes; v. 9, n. 4, p. 1089-1097, AUG 2013.
• Citações Web of Science: 16

Resumo

The hierarchical mating system among and within fruits of Jatropha curcas was investigated in a base population using five microsatellite loci, employing mixed mating and correlated mating models. Open-pollinated fruits were collected from 15 randomly selected seed trees, sampling seven fruits per tree for a total of 21 seeds from each tree. We detected multilocus genotypes identical to the mother tree in 13 % of offspring, implying the occurrence of apomixis in J. curcas. The presumed apomictic individuals were excluded from the analysis of the remaining results. Evidence of substantial selfing was provided by the average multilocus outcrossing rate (t (m) = 0.683), showing that the species exhibits a mixed mating system. The outcrossing rate showed a large variation among seed trees, ranging from 0.21 to 1.0, indicating that the species is not self-incompatible. Significant differences were detected between the multilocus and the single locus outcrossing rates (t (m) -aEuro parts per thousand t (s) = 0.347) that suggested mating among related individuals, possibly because of the presence of individuals from the same progeny (sibs) in the base population. The multilocus paternity correlation was extremely high for the population (r (p(m)) = 0.999), indicating that the progenies were manly composed of full-sibs. As a consequence of selfing and a high paternity correlation, the co-ancestry coefficient within the progeny was higher (I similar to = 0.369) than expected for panmictic populations. Our results indicated that J. curcas produces seeds asexually by apomixis and sexually by a mixed mating system, combining selfing and outcrossing. (AU)

• Processo FAPESP: 07/04840-2 - Variabilidade genética e estimativa da taxa de cruzamento do pinhão-manso (Jatropha curcas L.) empregando marcadores moleculares
• Beneficiário: Eduardo de Andrade Bressan
• Modalidade de apoio: Bolsas no Brasil - Doutorado