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Bragantia

Print version ISSN 0006-8705On-line version ISSN 1678-4499

Bragantia vol.44 no.2 Campinas  1985

https://doi.org/10.1590/S0006-87051985000200010 

ARTIGOS

 

Um caso de translocação em um híbrido entre Zea mays L. e Z. mexicana (Schrad.) Kuntze1

 

Chromosomal translocation in a hybrid between Zea mays L. and Z. mexicana (Schrad.) Kuntze

 

 

Neiva Izabel Pierozzi2; Neusa Diniz da Cruz

Seção de Citologia, Instituto Agronômico (IAC), Caixa Postal 28, 13100 Campinas (SP)

 

 


RESUMO

Foi constatada, citologicamente, a presença de uma translocação heterozigota envolvendo dois cromossomos não-homólogos em um híbrido entre Zea mays L. e Z. mexicana (Schrad.) Kuntze. As análises citológicas foram feitas na microsporogênese das plantas híbridas, onde se observou a característica configuração em cruz que os cromossomos translocados assumem na fase de paquíteno, bem como as configurações em cadeia ou anel na diacinese e anel torcido na metáfase I. A contagem dos grãos de pólen indicou 44,0% ± 1,2 de esterilidade, que foi atribuída diretamente à translocação e não à hibridação. Devido ao mau espalhamento dos cromossomos na fase de paquíteno, não se puderam identificar os cromossomos envolvidos na translocação, estimando-se, porém, que estejam entre os três cromossomos maiores do genoma (cromossomos 1, 2 e 3).

Termos de indexação: translocação heterozigota, Zea mays, Z. mexicana, híbrido interespecífico, semi-esterilidade.


SUMMARY

Aheterozygous translocation involving two non homologous chromosomes was observed in a hybrid between Zea mays L. and Z. mexicana (Schrad.) Kuntze. The cytological observations were made at the microspore phase. A cross-shaped synaptic figure formed by the translocated chromosomes was shown at pachytene as well as the chain configurations at diakinesis and ring shaped formations at metaphase I. Pollen sterility was 44.0% ± 1.2 and it was probably due to the presente of lhe translocation rather than to the interspecific hybridization itself. Because of poor pachytene spreading, chromosomes involved in the translocation could not be identified. However, they appear to belong to the group of the large chromosomes (1, 2 or 3).

Index terms: heterozygous translocation; Zea mays, Z mexicana, interspecific hybrid, semi-sterility.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

REFERÊNCIAS BIBLIOGRÁFICAS

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Recebido para publicação em 13 de junho de 1984.

 

 

1 Trabalho apresentado na XXIX Reunião da SBPC, São Paulo, 1977.
2 Com bolsa de suplementação do CNPq.

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