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JXB Advance Access published online on September 5, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri274
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org
Received May 18, 2005
Accepted July 29, 2005

RESEARCH PAPER

Perturbed reproductive development in salt-treated Sorghum bicolor: a consequence of modifications in regulation networks?

G. Nissim Amzallag 1*

1 The Judea Center for Research and Development, Carmel, 90404, Israel

* To whom correspondence should be addressed.
G. Nissim Amzallag, E-mail: nissamz{at}bgumail.bgu.ac.il


  Abstract

In Sorghum bicolor, tolerance to salinity is improved by a 3-week treatment with 150 mM NaCl during early vegetative development. However, a strong decrease in fertility is also observed, suggesting that reproductive development becomes perturbed by this adaptive response to salinity. This study is an attempt to clarify the origin of such a paradoxical phenomenon. The relationships between end-cycle characters are modified by the NaCl treatment: some linkages disappear, while others are strengthened, especially those linking fertility with plant height. In parallel, a transient reduced level of linkage between leaf characters is observed around the unfolding of the eighth to the tenth leaves, defining a critical period in vegetative development separating two discrete phases. A relationship is observed between events occurring during this short critical period and the NaCl-induced perturbations in fertility. This suggests that reproductive development is conditioned by the influence of salinity on events occurring during a short period of vegetative development, independently of the level of tolerance to salinity quantified by the rate of vegetative growth.

Keywords: Connectance; critical period; fertility; individuality; phenotypic plasticity; regulation networks; salinity.
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