INDUCTIVE SUBSTANCES IN FABACEAE: PHYTOALEXINS OR ANTIOXIDANTS?

Dan, Ana Margareth Manhães Seabra; Kaplan, Maria Auxiliadora Coelho

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Artigo Original • Floresta Ambient. 9 (1) • Jan-Dec 2002 •

INDUCTIVE SUBSTANCES IN FABACEAE: PHYTOALEXINS OR ANTIOXIDANTS?

Authorship SCIMAGO INSTITUTIONS RANKINGS

Comparison of the structure of inductive and constitutive isoflavonoids of Fabaceae reveal a stronger trend towards the biosynthesis of compounds endowed with more potent antioxidant properties to characterize the former metabolic category. The function of inductive isoflavonoids should thus defense of plant tissue against injury-stimulated oxidative burst.

Key words:
Isoflavonoids; phytoalexins; Fabaceae

Tabela 1 Número de isoflavonóides cm Fabaceae.

	T	I	c	I/C
Isoflavones	138	33	126	0.26
Coumcstans	29	10	23	0.43
Isoflavanones	45	18	32	0.56
Isollavans	47	20	34	0.59
Pterocarpans	74	49	37	1.32

Tabela 2 Número de isoflavonóides prenilados e não premiados em Fabaccac.

	PI	NI	PI/NI	PC	NC	PC/NC	PI/PC
Isoflavoncs	7	26	0.27	52	74	0.70	0.13
Coumestans	4	6	0.67	6	17	0.35	0.67
Isotlavanones	9	9	1.00	l l	21	0.52	0.82
Isoflavans	8	12	0.67	8	26	0.31	1.00
Pterocarpans	24	25	0.96	7	30	0.23	3.43

Tabela 3 Número de isoflavonóidcs com 2 a 7 oxi-substituição em Fahaceac.

	2		3			4	5		6		7			NG₀
	I	C	I	C	I	C	I	C	I	c	I	c	I	C	I/C
Isoflavones	8	10	16	46	9	56	-	12	-	2	-	-	3.03	3.60	0.84
Coumeslans	6	8	4	10	-	4	-	1	-	-	-	-	2.40	2.91	0.82
Isoflavanones	0	3	5	4	13	21	-	4	-	-	-	-	3.72	3.81	0.98
Isoflavans	0	1	11	7	9	16	-	6	-	3	-	1	3.45	4.18	0.83
Pterocarpans	12	12	29	15	4	9	4	1	-	-	-	-	2.79	2.97	0.94

Tabela 4 Número de iso1lavonóides com O a 4 hidroxilas fenólicas livres.

	0		1		2		3		4		NOH ₁
	I	C	I	C	I	C	I	C	I	C	I	C	1/C
Isotlavoncs	3	20	8	33	7	34	9	29	5	11	2.16	1.83	1.18
Coumcstans	-	3	4	11	4	7	2	2	-	-	1.80	1.35	1.33
Isotlavanones	-	4	2	6	4	8	8	9	4	5	2.22	2.16	1.03
lsoflavans	-	2	9	9	8	11	3	12	-	-	1.70	1.97	0.86
Pterocarpans	2	12	18	18	25	13	4	-	-	-	1.63	1.01	1.61

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