Endogenous Inhibitors and Germination ofBeta vulgaris

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Abstract
The nature and importance of endogenous germination inhibitors in rubbed triploid monogerm sugar beet fruits were studied. Experimental evidence suggests that germination inhibitors do not play an important role in the prevention of germination of rubbed fruits. Putative inhibitory compounds known to occur in sugar beet extracts were found to have little effect on germination. Measures to leach out water soluble compounds also had little effect on germination. Concentrated fruit extracts were found to inhibit the germination of sugar beet seeds by virtue of their osmotic potentials, and this was related to the salt content of the fruit extracts. However, a positive relationship was found between salt content and the original germination of the fruit lines. This relationship could have important consequences for assessment of fruit maturity and subsequent germination behaviour at harvest. The causes of poor germination in rubbed fruit lie not in the presence of inhibitory compounds in the fruit coat but in some other property of the fruit.

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