Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Does abscisic acis affect strigolactone biosynthesis?
Lopez-Raez, J.A. ; Kohlen, W. ; Charnikhova, T. ; Mulder, P.P.J. ; Undas, A.K. ; Sergeant, J. ; Verstappen, F. ; Bugg, T.D.H. ; Thompson, A.J. ; Ruyter-Spira, C.P. ; Bouwmeester, H.J. - \ 2010
New Phytologist 187 (2010)2. - ISSN 0028-646X - p. 343 - 354.
arbuscular mycorrhizal fungi - parasitic plants - germination stimulants - arabidopsis-thaliana - phosphorus stress - mutant notabilis - orobanche spp. - tomato plants - water-stress - wild-type
Strigolactones are considered a novel class of plant hormones that, in addition to their endogenous signalling function, are exuded into the rhizosphere acting as a signal to stimulate hyphal branching of arbuscular mycorrhizal (AM) fungi and germination of root parasitic plant seeds. Considering the importance of the strigolactones and their biosynthetic origin (from carotenoids), we investigated the relationship with the plant hormone abscisic acid (ABA). Strigolactone production and ABA content in the presence of specific inhibitors of oxidative carotenoid cleavage enzymes and in several tomato ABA-deficient mutants were analysed by LC-MS/MS. In addition, the expression of two genes involved in strigolactone biosynthesis was studied. The carotenoid cleavage dioxygenase (CCD) inhibitor D2 reduced strigolactone but not ABA content of roots. However, in abamineSG-treated plants, an inhibitor of 9-cis-epoxycarotenoid dioxygenase (NCED), and the ABA mutants notabilis, sitiens and flacca, ABA and strigolactones were greatly reduced. The reduction in strigolactone production correlated with the downregulation of LeCCD7 and LeCCD8 genes in all three mutants. The results show a correlation between ABA levels and strigolactone production, and suggest a role for ABA in the regulation of strigolactone biosynthesis.
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