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Collection and Identification of Pollen from Honey Bee Colonies
08:11

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Published on: January 19, 2021

Cyclic pollen production in Cedrus deodara.

Vinod Prasad Khanduri1, Chandra Mohan Sharma

  • 1Department of Forestry, Mizoram University, Aizawl, Mizoram, India. vpkhanduri@yahoo.co.in

Sexual Plant Reproduction
|December 25, 2009
PubMed
Summary

Cedrus deodara pollen production in the Garhwal Himalaya exhibits a biennial cycle, with significant variations influenced by year and population. Pollen release is optimized during peak temperatures and low humidity.

Area of Science:

  • Botany
  • Ecology
  • Plant Science

Background:

  • Cedrus deodara (deodar cedar) is a significant coniferous species in the Himalayan region.
  • Understanding its reproductive biology, particularly pollen production, is crucial for ecological and conservation studies.

Purpose of the Study:

  • To investigate the patterns of pollen production and release in Cedrus deodara over a seven-year period.
  • To identify factors influencing pollen output, including yearly cycles and population-specific variations.

Main Methods:

  • A seven-year field study was conducted on two natural populations of Cedrus deodara.
  • Pollen productivity was assessed by analyzing the number of pollen strobili, microsporophylls, and pollen grains per tree.
  • Microsporangium dehiscence timing and environmental correlations were recorded.

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Main Results:

  • Pollen production in Cedrus deodara follows a distinct two-year cycle, alternating between low and high production years.
  • Significant year-to-year and population-level variations were observed in pollen productivity parameters.
  • Microsporangium dehiscence occurred over 2.5–3.5 days, peaking between 12:00–14:00 h, coinciding with high temperatures and low humidity.
  • Annual pollen production per tree ranged from 1.4 x 10^9 to 22.3 x 10^9 grains.

Conclusions:

  • Cedrus deodara exhibits a biennial reproductive strategy for pollen release.
  • Environmental factors like temperature and humidity play a role in the timing of pollen release.
  • The study highlights the variability in pollen production within and between populations, important for understanding its reproductive success.