During pollination the pollen tube grows into the style and toward the ovary via the transmitting tract. In lily the growth of pollen tubes involves tube cell adhesion to transmitting tract cells. We reported two molecules involved in this adhesion event. One is a pectic polysaccharide and the other, a 9 kDa basic protein named SCA for stigma/stylar cysteine-rich adhesin. SCA, which shows some identity with LTP (lipid transfer protein), was localized to the transmitting tract epidermis of the style where pollen tubes adhere. The present studies on the expression of SCA indicate that the protein has a similar expression pattern with LTP1 in Arabidopsis and that the protein is abundant in both the stigma and the style. For further proof of its role in pollen tube adhesion the activity of Escherichia coli-expressed protein has been studied in an in vitro adhesion assay system.
Plant Molecular Biology – Springer Journals
Published: Oct 17, 2004
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