Genomic behavior of hybrid combinations between elephant grass and pearl millet

Pesquisa Agropecuária Brasileira

Fernando Ferreira Leão²  Lisete Chamma Davide¹  José Marcello Salabert De Campos¹  Antonio Vander Pereira¹  Fernanda De Oliveira Bustamante¹ 

[1] ,Universidade Federal de Tocantins Campus Gurupi Gurupi TO ,Brazil

关键词: Pennisetum glaucum;    Pennisetum purpureum;    DNA content;    interspecific hybrids;    mixoploidy;    Pennisetum glaucum;    Pennisetum purpureum;    conteúdo de DNA;    híbridos interespecíficos;    mixoploidia;   

DOI  :  10.1590/S0100-204X2011000700006

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the genomic behavior of hybrid combinations between elephant grass (Pennisetum purpureum) and pearl millet (P. glaucum). Tetraploid (AAA'B) and pentaploid (AA'A'BB) chromosome races resulting from the backcross of the hexaploid hybrid to its parents elephant grass (A'A'BB) and pearl millet (AA) were analyzed as to chromosome number and DNA content. Genotypes of elephant grass, millet, and triploid and hexaploid induced hybrids were compared. Pentaploid and tetraploid genomic combinations showed high level of mixoploidy, in discordance with the expected somatic chromosome set. The pentaploid chromosome number ranged from 20 to 34, and the tetraploid chromosome number from 16 to 28. Chromosome number variation was higher in pentaploid genomic combinations than in tetraploid, and mixoploidy was observed among hexaploids. Genomic combinations 4x and 5x are mixoploid, and the variation of chromosome number within chromosomal race 5x is greater than in 4x.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License