Abstract
The activities of arginase, glutamine synthetase (GS) and glutamate dehydrogenase (GDH) were studied in both moist chilled (5°C) and warm (27°C) incubated walnut (Juglans regia. L) kernels to asses whether the non-germinability of dormant kernels is associated with failure in amino acid metabolism. Warm-incubated kernels showed low germination (25%), whereas cold-stratified kernels displayed germination up to 61%. Arginase activity increased about twofold in imbibed kernels. It remained at a high level in cold-stratified kernels from mid-period of incubation onwards; however, in warm-incubated kernels the activity declined after an initial increase so that by 20 days, it was negligible. No significant differences in GS activity occurred between cold-stratified and warm-incubated kernels, but the activity of GDH was significantly more in kernels incubated at warm conditions. Thin-layer chromatographic separation of polyamines revealed greater ammonia, spermidine and an unknown polyamine accumulation in warm-incubated kernels. Thus, the declined rate of walnut kernel germination under warm conditions is mainly correlated with rapid inactivation of arginase, greater levels of ammonia and alterations in kernel polyamine composition. The enhanced activity of GDH in warm-incubated kernels implies that catabolic deamination of amino acids and their subsequent respiration is the favored pathway ongoing under warm conditions. This situation compromises germination-specific metabolism of amino acids which likely to operate better at lower temperatures during cold stratification of kernels.
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Abbreviations
- GDH:
-
Glutamate dehydrogenase
- GS:
-
Glutamine synthetase
- PMSF:
-
Phenylmethylsulfonyl fluoride
- EDTA:
-
Ethylene diamine tetraacetic acid
- PVPP:
-
Polyvinylpolypyrrolidone
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Acknowledgments
We thank the GUASNR Deputy of Research and Office of Higher Education for financial support to M. Zarei Ghadikolaee in the form of Grants for M.Sc. research projects. Thanks are also due to Dr. Majid Azimmohseni from the Department of Statistics, Golestan University for the statistical consult of the project and Ms. Mahrokh Sharbatkhory from the GUASNR Central Laboratory for her technical assistance.
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Communicated by F. Canovas.
Ahmad Abdolzadeh Contribution share of 40% according to the University Promotion Table.
Hamid Reza Sadeghipour Former member of Gorgan University of Agricultural Sciences and Natural Resources.
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Zarei-Ghadikolaee, M., Abdolzadeh, A. & Sadeghipour, H.R. Arginase, glutamine synthetase and glutamate dehydrogenase activities in moist chilled and warm-incubated walnut kernels. Trees 24, 425–433 (2010). https://doi.org/10.1007/s00468-010-0410-4
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DOI: https://doi.org/10.1007/s00468-010-0410-4