Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 57, Issue 13, Pages 5853-5864Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf900870j
Keywords
Sesquiterpene lactones; guaianolides; guaianestrigolactones; SAR; germination stimulants; allelopathy; parasitic weeds; broomrape; Orobanche cumana; Orobanchaceae
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A comparative structure-activity relationship (SAR) study has been conducted with several guaianolide sesquiterpene lactones (SLs) as inducers of the germination of sunflower broomrape (Orobanche cumana) seeds. Compounds were selected and synthesized to study the influence of the lactone-enol-gamma-lactone moiety on the selectivity of SLs toward the stimulation of sunflower broomrape germination. The results clearly illustrate that SLs are recognized only by O. cumana, while the introduction of a strigol-like second lactone moiety in the guaianolide backbone results in the loss of specificity and hence the germination of other broomrape species. We have named this new class of compounds guaianestrigolactones (GELs).
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