The temporal and spatial transcription pattern in root nodules of Vicia faba nodulin genes encoding glycine-rich proteins
1997
Schroder, G. | Fruhling, M. | Pühler, A. | Perlick, A.M.
Four different transcript sequences encoding gene products with an unusually high glycine content were identified in Vicia faba root nodules. Northern blot analysis revealed a strong nodule specific expression of the corresponding genes. Time course experiments showed that two of these genes were transcribed before the onset of leghemoglobin expression and hence were designated VfENOD-GRP2 and VfENOD-GRP5, whereas the first detection of VfNOD-GRP1 and VfNOD-GRP4 transcripts coincided with the appearance of leghemoglobin transcripts in V. faba root nodules. A characteristic feature of all encoded nodulins was a hydrophobic N-terminus, which in the case of the nodulins ENOD-GRP2 and ENOD-GRP5 has the characteristics of a signal peptide. Such a structure is comparable to other plant glycine-rich proteins described as components of the plant cell wall. Based on tissue print hybridizations, we found that VfNOD-GRPI, VfENOD-GRP2 and VfNOD-GRP4 were expressed in the interzone II-III and in the whole nitrogen-fixing zone III. In contrast to VfENOD-GRP2 and VfNOD-GRP4, the signal intensity of hybridizing VfNOD-GRP1 transcripts was slightly reduced in the more proximal part of broad bean root nodules. Apart from the interzone II-III and the nitrogen fixing zone III, VfENOD-GRP5 RNA was also detected in large areas of the prefixing zone II.
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