Journal
PHYSIOLOGIA PLANTARUM
Volume 119, Issue 2, Pages 253-262Publisher
BLACKWELL MUNKSGAARD
DOI: 10.1034/j.1399-3054.2003.00181.x
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The effects of phenylpropanoid deficiency on plant growth, photosynthetic efficiency of the photosystem II and freezing tolerance of leaves were studied during acclimation of winter oilseed rape plants ( Brassica napus L. var. oleifera L. cv Jantar) at low temperature. Application of 2-amino-2-indanophosphonic acid inhibited phenylalanine ammonia-lyase (E. C. 4.3.1.5) activity by about 90%. This was followed by a marked reduction of soluble phenolics ( in particular hydroxycinnamic acids) and anthocyanins in leaves. Inhibition of the cold-promoted incorporation of ferulic acid into cell walls was also observed. The reduction of phenylpropanoid contents was associated with: (1) partial abrogation of the cold-induced growth effects, such as inhibition of leaf fresh weight increments and accumulation of dry matter, proteins and cell walls; (2) decreased photochemical efficiency of photosystem II in low temperature-affected leaves; and (3) decreased ability of leaves to develop tolerance to the extracellular formation of ice. These findings are discussed in terms of phenylpropanoids' role in plant responses to cold (>0degreesC) and freezing temperatures.
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