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Annals of Botany 82: 641-645, 1998
© 1998 Annals of Botany Company

Biochemical and Ultrastructural Changes in Pollen ofZea maysL. Grown Under Enhanced UV-B Radiation

A. SANTOS+,, J. M. ALMEIDA, I. SANTOS and R. SALEMA

Department of Botany and Institute for Molecular and Cell Biology (IBMC), University of Porto, R. Campo Alegre 823, 4150, Porto, Portugal

January 22, 1998 ; March 3, 1998 . July 6, 1998 .

The influence of ultraviolet-B (UV-B) radiation on the development of the male gametophyte was studied inZea maysL. cv. LG12 grown in a growth chamber under PAR light supplemented with UV-B radiation and compared with a second set of plants grown under PAR light. Pollen samples collected from both groups of plants were cultured on germination medium and it was found that UV-B had no effect on pollen germination. Total pollen protein content was not affected but UV-B absorbing pigments increased. Some ultrastructural alterations were observed in pollen and pollen tubes, in particular large amounts of electron dense deposits were seen throughout the cytoplasm and in association with the pollen wall. In mature spikes of UV-B treated plants, anthers retained numerous pollen grains in their loculi while anthers of control plants were almost empty. UV-B treatment delayed flowering by 2–3 d. These results show that UV-B treatment of maize plants interferes with flowering, pollen ultrastructure and anther maturation even though pollen germination is unaffected. The significant increase of UV-B absorbing pigments in pollen grains could represent a defence mechanism that enables plants to complete their reproductive cycle.Copyright 1998 Annals of Botany Company

Zea maysL., maize, UV-B radiation, pollen.


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