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J Plant Physiol. 2008 May 5;165(7):691-6. Epub 2007 Oct 10.

Secretion of momilactone A from rice roots to the rhizosphere.

Author information

1
Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa 761-0795, Japan. hisashi@ag.kagawa-u.ac.jp

Abstract

The secretion levels of momilactone A from rice (Oryza sativa L.) seedlings of eight cultivars into the rhizosphere were compared with the endogenous momilactone A concentrations in their shoots and roots. All rice cultivars contained momilactone A in the shoots and roots, and concentrations differed among the cultivars. Momilactone A was also found in all culture solutions in which the rice seedlings were grown, and the concentrations differed among the cultivars. The momilactone A concentrations in the culture solutions were reflected in the momilactone A concentrations in the shoots. These results suggest that all rice cultivars may produce momilactome A and secrete momilactone A into the culture solutions. The secretion levels of momilactone A may be more dependent on their capacities for momilactone A production in the shoots than on their capacities for momilactone A transportation from the shoots into the environment via the roots. As momilactone A acts as an antimicrobial and allelopathic agent, the secretion of momilactone A into the rice rhizosphere may provide a competitive advantage for root establishment through local suppression of soil microorganisms and inhibition of the growth of competing plant species.

PMID:
17931745
DOI:
10.1016/j.jplph.2007.07.018
[Indexed for MEDLINE]
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