A size-mediated effect can compensate for transient chilling stress affecting maize (Zea mays) leaf extension
Article first published online: 30 APR 2010
© The Authors (2010). Journal compilation © New Phytologist Trust (2010)
Volume 187, Issue 1, pages 106–118, July 2010
How to Cite
Louarn, G., Andrieu, B. and Giauffret, C. (2010), A size-mediated effect can compensate for transient chilling stress affecting maize (Zea mays) leaf extension. New Phytologist, 187: 106–118. doi: 10.1111/j.1469-8137.2010.03260.x
- Issue published online: 4 JUN 2010
- Article first published online: 30 APR 2010
- Received: 18 December 2009, Accepted: 7 March 2010
- cell division;
- chilling stress;
- leaf extension;
- size-mediated effect;
- Zea mays (maize)
- •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.