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The cucumber ( Cucumis sativus L.) gene Cucumis sativus Somatic Embryogenesis Zinc Finger 1 ( CsSEF1 ) was suggested to be a good marker gene for sugar starvation in fruit. The expression of this gene in fruits is dramatically upregulated in plants that have suffered either complete defoliation or prolonged darkness. CsSEF1 was initially discovered as a gene that was upregulated during somatic embryogenesis. We examined the difference in fruit parts and the effect of pollination on the upregulation of CsSEF1 induced by defoliation treatment. The results indicated that the upregulation of CsSEF1 in fruit by defoliation is not dependent on the presence of developing embryos. The expression of CsSEF1 was upregulated in malformed fruit induced by salinity in which the development of placenta was arrested. Partial cutting of the distal part of the fruit showed that if placenta tissue remained there was no upregulation of CsSEF1 , whereas when placenta tissue did not remain there was a marked upregulation of CsSEF1 . These results could be consistently interpreted as showing that placenta tissue induced the transport of photoassimilates to the fruit and that without developing placenta tissue, pericarp tissue suffers from severe sugar starvation. This interpretation, in turn, enforces the view that CsSEF1 is a good marker gene of fruit sugar starvation.

The expression of a candidate cucumber fruit sugar starvation marker gene CsSEF1 is enhanced in malformed fruit induced by salinity