期刊
PLANT CELL AND ENVIRONMENT
卷 29, 期 5, 页码 746-753出版社
WILEY
DOI: 10.1111/j.1365-3040.2005.01435.x
关键词
abiotic stress
Laccases are multi-copper-containing glycoproteins and comprise a multi-gene family in plants. However, their physiological functions are still not well understood. We obtained sequence information for a putative laccase gene, ZmLAC1, from maize and studied ZmLAC1 expression in detail. The deduced ZmLAC1 protein was 70% identical to LpLAC5-4, a laccase from ryegrass. ZmLAC1 was expressed in leaves, stems and roots of maize seedlings. In unstressed maize primary roots, a higher ZmLAC-1 transcript level was located in the basal region where cell elongation had ceased compared to the apical 5 mm of the roots where cells were rapidly dividing and elongating. A treatment with 300 mm NaCl resulted in a shortened root elongation zone (< 2 mm) and swelling in the apical 5 mm. Associated with the morphological change, the transcript level of ZmLAC1 was enhanced in the apical 5 mm, reaching a level similar to that in the basal region. Other abiotic stresses tested - such as 28.5% polyethylene glycol (PEG), which caused an inhibition of root elongation comparable to 300 mm NaCl - did not affect ZmLAC1 transcript level. Potential roles of ZmLAC1 in the roots responding to NaCl or other high concentration of salts are discussed.
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