The Lupinus albus class-III chitinase gene, IF3, is constitutively expressed in vegetative organs and developing seeds
| Autor: | Cândido Pinto Ricardo, Carla Pinheiro, Inês Chaves, Claudina Rodrigues-Pousada, Sheila Vidal, A. P. Regalado |
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| Předmět: |
Ultraviolet Rays
Blotting Western Molecular Sequence Data Plant Science Plant Roots Lupinus Complementary DNA Gene expression Genetics Amino Acid Sequence Rosales Gene Pathogenesis-related protein Plant Proteins biology Base Sequence cDNA library Chitinases food and beverages Biotic stress biology.organism_classification Blotting Northern Biochemistry Chitinase Seeds biology.protein Sequence Alignment Plant Shoots |
| Zdroj: | CIÊNCIAVITAE Scopus-Elsevier |
| Popis: | A cDNA fragment encoding a Lupinus albus. L. class-III chitinase, IF3, was isolated, using a cDNA probe from Cucumis sativus L., by in-situ plaque hybridization from a cDNA library constructed in the Uni-ZAP XR vector, with mRNAs isolated from mature lupin leaves. The cDNA had a coding sequence of 293 amino acids including a 27-residue N-terminal signal peptide. A class-III chitinase gene was detected by Southern analysis in the L. albus genome. Western blotting experiments showed that the IF3 protein was constitutively present during seed development and in all the studied vegetative lupin organs (i.e., roots, hypocotyls and leaves) at two growth stages (7- and 20-d-old plants). Accumulation of both the IF3 mRNA and IF3 protein was triggered by salicylic acid treatment as well as by abiotic (UV-C light and wounding) and biotic stress conditions (Colletotrichum gloeosporioides infection). In necrotic leaves, IF3 chitinase mRNA was present at a higher level than that of another mRNA encoding a pathogenesis-related (PR) protein from L. albus (a PR-10) and that of the rRNAs. We suggest that one role of the IF3 chitinase could be in the defense of the plant against fungal infection, though our results do not exclude other functions for this protein. |
| Databáze: | OpenAIRE |
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