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Pollen development in Rhododendron in relation to winter dormancy and bloom time
Olga E Mirgorodskaya1, Nuria K Koteyeva, Alexandra V Volchanskaya
1V.L. Komarov Botanical Institute of Russian Academy of Science, 2, Prof. Popov St., 197376, St. Petersburg, Russia.
Protoplasma
|February 4, 2015
Summary
Pollen development in Rhododendron species varies, impacting bloom times. Strategies differ between deciduous, evergreen, and semi-deciduous types, influencing spring and autumn flowering.
Area of Science:
- Plant reproductive biology
- Angiosperm development
- Rhododendron species
Background:
- Understanding pollen development is crucial for plant reproductive success.
- Annual growth cycles and dormancy influence reproductive organ development in Rhododendron.
Purpose of the Study:
- To investigate microsporogenesis and microgametogenesis in Rhododendron ledebourii, R. luteum, and R. catawbiense.
- To correlate pollen development stages with winter dormancy and flowering times.
Main Methods:
- Light and electron microscopy were employed.
- Comparative analysis across three Rhododendron species (semi-deciduous, deciduous, evergreen).
Main Results:
- Pollen development takes approximately 11 months, starting in June/July.
- R. luteum and R. catawbiense microspores overwinter at the vacuolization stage, with mitosis before June flowering.
- R. ledebourii exhibits two flower types with distinct microgametogenesis timing, enabling potential autumn or spring blooming.
Conclusions:
- Pollen development strategies vary within and between Rhododendron species.
- These strategies are linked to flowering time (spring and autumn) rather than leaf drop.
- R. ledebourii flower buds are developmentally advanced by winter, leading to earlier blooming.
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