Degradation of the Pterocarpan Phytoalexin (—)-Maackiain by Ascochyta rabiei
1989 ◽
Vol 44
(9-10)
◽
pp. 771-776
◽
Keyword(s):
Ten strains of Ascochyta rabiei pathogenic to chickpea ( Cicer arietinum L.) were shown to be potent degraders of the chickpea pterocarpan phytoalexin ( - )-maackiain (1) ([6aR: 11 aR]-3- hydroxy-8,9-methylenedioxypterocarpan). In degradative studies with mycelial preparations and crude protein extracts seven catabolites could be isolated and structurally elucidated by spectroscopic techniques. The main routes of maackiain degradation are reduction to a 2´-hydroxyisoflavan (2) and oxidation to an 1 a-hydroxy-pterocarp-1,4-diene-3-one (3) with subsequent reductions of the early catabolites in ring A. A catabolic sequence for maackiain is compared with the degradation pattern of pterocarpan phytoalexins observed with other fungi.
1987 ◽
Vol 42
(7-8)
◽
pp. 897-901
◽
1987 ◽
Vol 42
(11-12)
◽
pp. 1171-1178
◽
1986 ◽
Vol 117
(4)
◽
pp. 321-335
◽
2009 ◽
Vol 89
(3)
◽
pp. 515-516
◽
2000 ◽
Vol 57
(6)
◽
pp. 243-254
◽
2005 ◽
Vol 56
(4)
◽
pp. 317
◽
1933 ◽
Vol 20
(4)
◽
pp. 612-632
◽
Keyword(s):