CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Gibberellic Acid-Induced Pollen Mortality and Abnormal Microsporogenesis in Safflower
Girjesh KumarPreeti Srivastava
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JOURNAL OPEN ACCESS

2009 Volume 74 Issue 2 Pages 171-176

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Abstract

The present research work was undertaken to assess the effect of gibberellic acid (GA3) applied exogenously to the Safflower plant for the study of pollen behavior. A cytological characterization in safflower from meiosis to pollen formation revealed that whereas meiosis was recorded to be normal in control plants with normal microsporogenesis, GA3-treated plants possessed disturbed tetrad configurations of pollen. GA3 caused deductions in pollen yield and increased the formation of abnormal meiotic products. Our study elucidates that the microspore sacs, instead of having normal four microspores, possessed 1 (monad), 2 (dyads), 3 (triads) and even up to 5 (polyads) microspores, which may produce unreduced gametes at later stages. A significant variation in the degree of pollen mortality was also displayed amongst these pollens. Another interesting feature noticed during the study was the fusion among tetrads due to wall dissolution.

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© (2009), The Japan Mendel Society
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