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Annals of Botany 67: 29-33, 1991
© 1991 Annals of Botany Company

RESEARCH-ARTICLE

Absence of Callose and Tetrad in the Microsporogenesis of Pandanus odoratissimus with Well-formed Pollen Exine

K. PERIASAMY* and J. AMALATHAS{dagger}

*Department of Botany, Bharathidasan University Tiruchirapalli 620 024, India
{dagger}Jamal Mohamed College Higher Secondary School Tiruchirapalli 620 020, India

Accepted: 23 June 1990   

In the microsporocytes of Pandanus odoratissimus, cytokinesis is successive with centrifugal cleavage in both the meiotic divisions. The dyads move apart from each other after the first division, and the microspores likewise after the second division, so that only monads are formed at the end of meiosis. Although no trace of callose wall is found at any stage around the microsporocyte or microspore, fertile, monocolpate pollen with well-developed, spinescent exine develops, and is shed at the two-celled stage.

Pandanus odoratissimus, microsporogenesis, centrifugal cleavage, absence of callose, monad formation


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