Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Localization of Expression of Three Cold-Induced Genes, blt101, blt4.9, and blt14, in Different Tissues of the Crown and Developing Leaves of Cold-Acclimated Cultivated Barley1

Roger S. Pearce*, Claire E. Houlston, Kathryn M. Atherton, Jane E. Rixon, Paul Harrison, Monica A. Hughes, and M. Alison Dunn

Department of Biological and Nutritional Sciences (R.S.P., C.E.H., K.M.A., J.E.R., P.H.), and Department of Biochemistry and Genetics (M.A.H., M.A.D.), The University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, United Kingdom

Tissues expressing mRNAs of three cold-induced genes, blt101, blt14, and blt4.9, and a control gene, elongation factor 1alpha , were identified in the crown and immature leaves of cultivated barley (Hordeum vulgare L. cv Igri). Hardiness and tissue damage were assessed. blt101 and blt4.9 mRNAs were not detected in control plants; blt14 was expressed in control plants but only in the inner layers of the crown cortex. blt101 was expressed in many tissues of cold-acclimated plants but most strongly in the vascular-transition zone of the crown; blt14 was expressed only in the inner layers of the cortex and in cell layers partly surrounding vascular bundles in the vascular-transition zone; expression of blt4.9, which codes for a nonspecific lipid-transfer protein, was confined to the epidermis of the leaf and to the epidermis of the older parts of the crown. None of the cold-induced genes was expressed in the tunica, although the control gene was most strongly expressed there. Thus, the molecular aspects of acclimation differed markedly between tissues. Damage in the vascular-transition zone of the crown correlated closely with plant survival. Therefore, the strong expression of blt101 and blt14 in this zone may indicate a direct role in freezing tolerance of the crown.

1   The research was supported by the Biotechnological and Biological Sciences Research Council of the UK (grant no. 13/A000191).
*   Corresponding author; e-mail r.s.pearce{at}ncl.ac.uk; fax 44-191-222-8684.

Plant Physiol. (1998) 117: 787-795
Copyright Clearance Center:   0032-0889/98/117/0787/09
© 1998 American Society of Plant Physiologists




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