Influence of conditions and genotype on the amount of Striga germination stimulants exuded by roots of several host crops

Witchweeds (Striga spp.) are important root parasites of many cereals and legumes. Striga seeds do not germinate unless exposed to specific chemical signals produced by host and nonhost roots. We report a simple method for obtaining large quantities of relatively clean root exudate from several crop...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 1993-09, Vol.41 (9), p.1492-1496
Main Authors: Weerasuriya, Yohan, Siame, Bupe A, Hess, Dale, Ejeta, Gebisa, Butler, Larry G
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
CULTIVOS
EXSUDAT
EXUDADOS
FOTOPERIODISMO
Fundamental and applied biological sciences. Psychology
GERMINACION
GERMINATION
PANICUM MILIACEUM
Parasitic plants
Parasitic plants. Weeds
PENNISETUM TYPHOIDES
PHOTOPERIODICITE
Phytopathology. Animal pests. Plant and forest protection
PLANTE DE CULTURE
RACINE
RAICES
SORGHUM BICOLOR
STRIGA ASIATICA
VARIEDADES
VARIETE
ZEA MAYS
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Summary:Witchweeds (Striga spp.) are important root parasites of many cereals and legumes. Striga seeds do not germinate unless exposed to specific chemical signals produced by host and nonhost roots. We report a simple method for obtaining large quantities of relatively clean root exudate from several crop plants. A Striga seed germination assay was used to quantify stimulant activity produced and identify potential low stimulant producing resistant host plants. Stimulant activity produced by sorghum cultivars susceptible to Striga was several orders of magnitude greater than that of some resistant cultivars. Nonhost plants with capacity to stimulate germination of striga were also identified. Stimulant activity produced was much greater for plants grown using a short day length. In addition to germination stimulants, root exudates also contained inhibitor(s) of germination
ISSN:0021-8561
1520-5118
DOI:10.1021/jf00033a026