Diurnal variation in settling velocity of pollen released from maize and consequences for atmospheric dispersion and cross-pollination

Marcelo Chamecki, Simone C. Gleicher, Nicholas S. Dufault, Scott Alan Isard

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Settling velocity of maize (Zea mays L.) pollen plays an important role in its dispersal and, therefore, cross-pollination. Estimated probability density functions (PDFs) of settling velocity based on experimental measurements show strong variation between early morning and noon. The variation is correlated to the time-integrated vapor pressure deficit (VPDT) and reflects the drying of pollen grains. A model for the decrease in germination rate of pollen grains exposed to atmospheric conditions suggests that the decrease in settling velocity is accompanied by a decrease in pollen viability. A simple dispersion model is used to illustrate the possible consequences of changes in settling velocity and germination rate for pollen dispersal and cross-pollination of maize. Results suggest that current models of pollen dispersal that do not account for these changes overestimate cross-pollination rates.

Original languageEnglish (US)
Pages (from-to)1055-1065
Number of pages11
JournalAgricultural and Forest Meteorology
Volume151
Issue number8
DOIs
StatePublished - Aug 15 2011

All Science Journal Classification (ASJC) codes

  • Forestry
  • Global and Planetary Change
  • Agronomy and Crop Science
  • Atmospheric Science

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