Direct analysis of pollen fitness by flow cytometry: implications for pollen response to stress

Gilad Luria, Nicholas Rutley, Itay Lazar, Jeffery F. Harper, Gad Miller

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Sexual reproduction in flowering plants depends on the fitness of the male gametophyte during fertilization. Because pollen development is highly sensitive to hot and cold temperature extremes, reliable methods to evaluate pollen viability are important for research into improving reproductive heat stress (HS) tolerance. Here, we describe an approach to rapidly evaluate pollen viability using a reactive oxygen species (ROS) probe dichlorodihydrofluorescein diacetate (i.e. H2DCFDA-staining) coupled with flow cytometry. In using flow cytometry to analyze mature pollen harvested from Arabidopsis and tomato flowers, we discovered that pollen distributed bimodally into ‘low-ROS’ and ‘high-ROS’ subpopulations. Pollen germination assays following fluorescence-activated cell sorting revealed that the high-ROS pollen germinated with a frequency that was 35-fold higher than the low-ROS pollen, supporting a model in which a significant fraction of a flower's pollen remains in a low metabolic or dormant state even after hydration. The ability to use flow cytometry to quantify ROS dynamics within a large pollen population was shown by dose-dependent alterations in DCF-fluorescence in response to oxidative stress or antioxidant treatments. HS treatments (35°C) increased ROS levels, which correlated with a ~60% reduction in pollen germination. These results demonstrate the potential of using flow cytometry-based approaches to investigate metabolic changes during stress responses in pollen.

Original languageEnglish
Pages (from-to)942-952
Number of pages11
JournalPlant Journal
Volume98
Issue number5
Early online date13 Feb 2019
DOIs
StatePublished - Jun 2019

Bibliographical note

Publisher Copyright:
© 2019 The Authors The Plant Journal © 2019 John Wiley & Sons Ltd

Keywords

  • Arabidopsis thaliana
  • Solanum lycopersicum
  • dormancy
  • flow cytometry
  • fluorescence-activated cell sorting
  • heat stress
  • oxidative stress
  • pollen
  • reactive oxygen species
  • technical advance
  • viability

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