Genetic distance and its association with heterosis in cacao

Brazilian Archives of Biology and Technology

Luiz Antônio Dos Santos Dias²  Jane Marita¹  Cosme Damião Cruz¹  Everaldo Gonçalves De Barros²  Tânia Maria Fernandes Salomão² 

[1] ,Universidade Federal de Viçosa Departamento de Biologia Geral Viçosa MG ,Brazil

关键词: Genetic distances;    heterosis;    performance data;    RAPD data;    Theobroma cacao L.;   

DOI  :  10.1590/S1516-89132003000300005

来源: SciELO

【 摘 要 】

The efficiency of cacao breeding program can be increased by choosing superior crosses to be made between divergent clones. We assessed the genetic distance among five clones with RAPD data (genetic distance - GD) and with yield component data (Mahalanobis distance - MD). The clones were evaluated in a diallel, during five years, for five yield components. A total of 130 RAPD bands were scored. GD and MD were used to determine the correlation between genetic distances among clones and the performance of their hybrids. The correlation between GD and MD was 0.67 (P=0.03). Both distances were related to heterotic performance of hybrids for wet seed weight/plant and wet seed weight/fruit. The average hybrid performance for the same two yield components was correlated with only MD. Hence, genetic distances measured by RAPD and yield components can be used as a guide to the choice of the superior crosses.

【 授权许可】

CC BY-NC   
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