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Transmissional behavior of a new 9^B translocation in maize (Zea mays L)

Luiz S. Saraiva

Departamento de Biologia Geral, Universidade Federal de Viçosa, 36570 Viçosa, MG, Brasil

ABSTRACT

A new translocated chromosome in maize involving chromosome 9 and B chromosome was submitted to cytogenetical analysis. The 9^B translocated chromosome carried all of the distal heterochromatic blocks of the B chromosome, as well as most of the euchromatin, and lacked a small terminal segment of the short arm of chromosome 9. The average frequency of female transmission of the 9⁸ chromosome was 47.6% while the normal 9 was recovered in 52.4% of the eggs. Pollen grains with the 9^B chromosome were unable to germinate and failed to function in fertilization. However, the small Wd ring chromosome complemented the deficiency in the 9^B chromosome and made it transmissible through the pollen.

Keywords: Translocation; Zea mays.

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