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Possible Mechanism of Inhibition of 6-Methoxy-Benzoxazolin-2(3H)-One on Germination of Cress (Lepidium sativum L.)

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Abstract

6-Methoxy-benzoxazolin-2(3H)-one (MBOA) inhibited the germination of cress (Lepidium sativum L.) seeds at concentrations greater than 0.03 mM. Inhibition was overcome by sucrose, suggesting that MBOA may inhibit sugar metabolism in cress seeds. Induction of α-amylase activity in seeds was also inhibited by MBOA at concentrations greater than 0.03 mM. Inhibition of both germination and induction of α-amylase activity increased with increasing concentrations of MBOA, and the extent of germination correlated positively with the activity of α-amylase in the seeds. MBOA added to a reaction mixture for α-amylase assay did not affect enzyme activity, indicating that MBOA does not inhibit in vitro α-amylase activity. Cress seeds germinated approximately 16 hr after incubation, and inhibition of α-amylase by MBOA occurred within 6 hr after incubation. These results suggest that MBOA may inhibit the germination of cress seeds by inhibiting the induction of α-amylase activity, because α-amylase plays a key role in the conversion of reserve carbohydrate into soluble sugars, a prerequisite for seed germination.

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Authors and Affiliations

  1. Department of Biochemistry and Food Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa, 761-0795, Japan

    Hisashi Kato-Noguchi

  2. Department of Organic Chemistry, Faculty of Science, University of Cádiz, Apdo 40, 11520, Puerto Real, Spain

    Francisco A. Macías

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  1. Hisashi Kato-Noguchi
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  2. Francisco A. Macías
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Correspondence to Hisashi Kato-Noguchi.

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Kato-Noguchi, H., Macías, F.A. Possible Mechanism of Inhibition of 6-Methoxy-Benzoxazolin-2(3H)-One on Germination of Cress (Lepidium sativum L.). J Chem Ecol 32, 1101–1109 (2006). https://doi.org/10.1007/s10886-006-9041-z

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  • DOI: https://doi.org/10.1007/s10886-006-9041-z

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