Abstract
A novel cold-induced cystatin cDNA clone (TaMDC1) was isolated from cold acclimated winter wheat crown tissue by using a macroarray-based differential screening method. The deduced amino acid sequence consisted of a putative N-terminal secretory signal peptide of 37 amino acids and a mature protein (mTaMDC1) with a molecular mass of 23 kDa. The mTaMDC1 had a highly conserved N-terminal cystatin domain and a long C-terminal extension containing a second region, which exhibited partial similarity to the cystatin domain. The recombinant mTaMDC1 was purified from Escherichia coli and its cysteine proteinase inhibitory activity against papain was analyzed. The calculated Ki value of 5.8×10−7 M is comparable to those reported for other phytocystatins. Northern and western blot analyses showed elevated expression of TaMDC1 mRNA and protein during cold acclimation of wheat. In addition to cold, accumulation of the TaMDC1 message was induced by other abiotic stresses including drought, salt and ABA treatment. Investigation of in vitro antifungal activity of mTaMDC1 showed strong inhibition on the mycelium growth of the snow mold fungus Microdochium nivale. Hyphae growth was totally inhibited in the presence of 50 μg/ml mTaMDC1 and morphological changes such as swelling, fragmentation and sporulation of the fungus were observed. The mechanisms of the in vitro antifungal effects and the possible involvement of TaMDC1 in cold induced snow mold resistance of winter wheat are discussed.
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Abbreviations
- WC:
-
Wheat cystatin
- CA:
-
Cold acclimation
- NA:
-
Non-acclimation
- DA:
-
De-acclimation
- GST:
-
Gluthatione-S-transferase
- IPTG:
-
Isopropyl-β-D-thiogalactoside
- BAPA:
-
Benzoyl-L-arginine-p-nitroanilide
- PMSF:
-
Phenylmethylsulfonyl fluoride
- ABA:
-
Abscisic acid
- PDB (A):
-
Potato dextrose broth (agar)
- BSA:
-
Bovine serum albumin
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Acknowledgements
We would like to thank Dr. Fumihiro Terami (National Agricultural Research Center for Hokkaido Region, Japan) for kindly providing the snow mold strain and comments. This work was supported by a grant from MAFF (BioDesign 1207) to R.I. It was also supported by a JSPS postdoctral felloship to N.K.C.
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Christova, P.K., Christov, N.K. & Imai, R. A cold inducible multidomain cystatin from winter wheat inhibits growth of the snow mold fungus, Microdochium nivale . Planta 223, 1207–1218 (2006). https://doi.org/10.1007/s00425-005-0169-9
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DOI: https://doi.org/10.1007/s00425-005-0169-9