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How Male Sterility will occur in Plants

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It is essential to look at how male sterility manifests in plants before classifying them into various categories. One of the higher level of manifestations is

1. The absence of normal formation of male organs (stamens) in bisexual plants or no male flowers in dioecious plants.

2. Failure to develop normal microsporogenous tissue – anther.

3. Abnormal microsporogenesis leading to deformed or unviable pollen.

4. Abnormal pollen maturation : inability to germinate on compatible stigma.

5. No dehiscent anthers but viable pollen – sporophytic control.
6. Barriers other than incompatibility preventing pollen from reaching ovule.

File Courtesy: 
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual
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