A size-mediated effect can compensate for transient chilling stress affecting maize (Zea mays) leaf extension

New Phytol. 2010 Jul;187(1):106-118. doi: 10.1111/j.1469-8137.2010.03260.x. Epub 2010 Apr 30.

Abstract

*In this study, we examined the impact of transient chilling in maize (Zea mays). We investigated the respective roles of the direct effects of stressing temperatures and indirect whorl size-mediated effects on the growth of leaves chilled at various stages of development. *Cell production, individual leaf extension and final leaf size of plants grown in a glasshouse under three temperature regimes (a control and two short chilling transfers) were studied using two genotypes contrasting in terms of their architecture. *The kinetics of all the leaves emerging after the stress were affected, but not all final leaf lengths were affected. No size-mediated propagation of an initial growth reduction was observed, but a size-mediated effect was associated with a longer duration of leaf elongation which compensated for reduced leaf elongation rates when leaves were stressed during their early growth. Both cell division and cell expansion contributed to explaining cold-induced responses at the leaf level. *These results demonstrate that leaf elongation kinetics and final leaf length are under the control of processes at the n - 1 (cell proliferation and expansion) and n + 1 (whorl size signal) scales. Both levels may respond to chilling stress with different time lags, making it possible to buffer short-term responses.

MeSH terms

  • Cell Count
  • Cell Size
  • Cold Temperature*
  • Kinetics
  • Models, Biological
  • Organ Size
  • Plant Epidermis / cytology
  • Plant Leaves / anatomy & histology*
  • Plant Leaves / cytology
  • Plant Leaves / growth & development*
  • Stress, Physiological*
  • Time Factors
  • Zea mays / anatomy & histology*
  • Zea mays / cytology
  • Zea mays / growth & development*