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Cell-specific expression of genes of the lipid transfer protein family from Arabidopsis thaliana.
Plant & Cell Physiology 1999 January
We have characterized three cDNAs from a gene family encoding lipid transfer proteins, LTP, from Arabidopsis thaliana (Wassilewskija). In addition to the already characterized Ltp1, our analysis includes Ltp2 and Ltp3, two sequences previously known as expressed sequence tags (EST) only. The deduced amino acid sequences of the three cDNAs share 56 to 57% identity and show unique tissue- and cell-specific expression. Genes Ltp1 and LTp2 are located within approximately 1.4 kb of each other in tandem orientation. RNA hydridizations showed that all three LTP are expressed in flowering meristems, flowers and developing seeds. Ltp1 is expressed in leaves in addition. Ltp3, though not Ltp2, is also expressed in a short segment of the stem close to the flowering meristem. In contrast to the epidermis-specific Ltp1, both Ltp2 and Ltp3 are not restricted to the epidermis, but are also expressed in sub-epidermal layers of the organs in which they are found. In the upper stem segment, Ltp3 is predominantly cortical. It appears that the expression of these three cDNAs is sufficient to account for the formation of LTP in all meristematic and expanding cells of the aboveground plant. Evolutionary analysis allows the conclusion that each Ltp belongs to a different sub-family of genes. Additionally, parsimony analysis provides evidence that several copies of Ltp genes already existed in ancestors of the Brassicaceae family.
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