Caspase-like activities accompany programmed cell death events in developing barley grains

PLoS One. 2014 Oct 6;9(10):e109426. doi: 10.1371/journal.pone.0109426. eCollection 2014.

Abstract

Programmed cell death is essential part of development and cell homeostasis of any multicellular organism. We have analyzed programmed cell death in developing barley caryopsis at histological, biochemical and molecular level. Caspase-1, -3, -4, -6 and -8-like activities increased with aging of pericarp coinciding with abundance of TUNEL positive nuclei and expression of HvVPE4 and HvPhS2 genes in the tissue. TUNEL-positive nuclei were also detected in nucellus and nucellar projection as well as in embryo surrounding region during early caryopsis development. Quantitative RT-PCR analysis of micro-dissected grain tissues revealed the expression of HvVPE2a, HvVPE2b, HvVPE2d, HvPhS2 and HvPhS3 genes exclusively in the nucellus/nucellar projection. The first increase in cascade of caspase-1, -3, -4, -6 and -8-like activities in the endosperm fraction may be related to programmed cell death in the nucellus and nucellar projection. The second increase of all above caspase-like activities including of caspase-9-like was detected in the maturating endosperm and coincided with expression of HvVPE1 and HvPhS1 genes as well as with degeneration of nuclei in starchy endosperm and transfer cells. The distribution of the TUNEL-positive nuclei, tissues-specific expression of genes encoding proteases with potential caspase activities and cascades of caspase-like activities suggest that each seed tissue follows individual pattern of development and disintegration, which however harmonizes with growth of the other tissues in order to achieve proper caryopsis development.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Active Transport, Cell Nucleus
  • Caspases / genetics
  • Caspases / metabolism*
  • Cell Death
  • Cell Nucleus / metabolism
  • Endosperm / enzymology
  • Gene Expression Regulation, Plant
  • Hordeum / cytology*
  • Hordeum / enzymology
  • Hordeum / genetics
  • Hordeum / growth & development*

Substances

  • Caspases

Grants and funding

This work was supported in part by the Deutsche Forschungsgemeinschaft (DFG grants WE1608/2-1 for Volodymyr Radchuk and RA2061/3-1 for Ruslana Radchuk) and a grant of Vietnam Ministry of Education and Training for Van Tran. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.