Summary
Gel filtration and centrifugation studies were used to study the distribution of α-amylase activity in homogenates of barley (Hordeum vulgare L.) aleurone layers. The results obtained were consistent with the hypothesis that α-amylase is secreted via membrane-bound vesicles. The α-amylase activity in an homogenate of barley aleurone layers was derived not only from the enzyme retained in the aleurone cells but also from enzyme previously secreted from the cells but apparently retained by the cell walls. The amount of α-amylase retained by the cell wall was influenced by factors such as the buffer in which the layers were incubated or the presence of Actinomycin D in the incubation medium.
Similar content being viewed by others
Abbreviations
- GA3 :
-
gibberellic acid
- RER:
-
rough endoplasmic reticulum
- Act. D:
-
Actinomycin D
References
Briggs, D. E.: Modified assay for α-amylase in germinating barley. J. Inst. Brew. 73, 361–370 (1967)
Campbell, P. N.: Functions of polyribosomes attached to membranes of animal cells. FEBS Lett. 7, 1–7 (1970)
Chen, R. F., Jones, R. L.: Studies on the release of barley aleurone cell proteins: Kinetics of labelling. Planta (Berl.) 119, 193–206 (1974a)
Chen, R. F., Jones, R. L.: Studies on the release of barley aleurone cell proteins: autoradiography. Planta (Berl.) 119, 207–220 (1974b)
Chrispeels, M. J., Varner, J. E.: Gibberellic acid-enhanced synthesis and release of α-amylase and ribonuclease by isolated barley aleurone layers. Plant Physiol. 42, 398–406 (1967)
Clutterbuck, V. J., Briggs, D. E.: Enzyme formation and release by isolated barley aleurone layers. Phytochemistry 12, 537–546 (1973)
Firn, R. D.: The association of α-amylase activity with a particle in homogenates of barley aleurone tissue. Plant Physiol. (Suppl.) 51, 5 (1973)
Firn, R. D., Kende, H.: Some effects of applied gibberellic acid on the synthesis and degradation of lipids in isolated barley aleurone layers. Plant Physiology 54, 911–915 (1974)
Gibson, R. A., Paleg, L. G.: Lysosomal nature of hormonally induced enzymes in wheat aleurone cells. Biochem. J. 128, 367–375 (1972)
Gibson, R. A., Paleg, L. G.: Aust. J. Plant Physiol. (in press)
Jones, R. L.: Fractionation of the enzymes of the barley aleurone layer: evidence for a soluble mode of enzyme release. Planta (Berl.) 103, 95–109 (1972)
Jones, R. L., Varner, J. E.: The bioassay of gibberellins. Planta (Berl.) 72 53–59 (1967)
Paleg, L. G.: Physiological effects of gibberellic acid. II. The starch hydrolyzing enzymes of barley endosperm. Plant Physiol. 35, 902–906 (1960)
Varner, J. E., Mense, R. M.: Characteristics of the process of enzyme release from secretory plant cells. Plant Physiol. 49, 187–189 (1972)
Vigil, E. L., Ruddat, M.: Effect of gibberellic acid and actinomycin D on the formation and distribution of rough endoplasmic reticulum in barley aleurone cells. Plant Physiol. 51, 549–558 (1973)
Yomo, H.: Studies on α-amylase activating substance. IV. On the amylase activating action of gibberellin. Hakko Kyokaishi 18, 600–602 (1960)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Firn, R.D. On the secretion of α-amylase by barley aleurone layers after incubation in gibberellic acid. Planta 125, 227–233 (1975). https://doi.org/10.1007/BF00385599
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00385599