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Annals of Botany 74: 661-666, 1994
© 1994 Annals of Botany Company

Effect of Mechanical Stress on Sunflower (Helianthus annuus L.) Hypocotyl Growth

K. Peacock and A. R. Berg

Department of Plant and Soil Science, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen AB9 2UD, UK

Etiolated seedlings of Sunflower (Helianthus annuus L.) were subjected to mechanical stress by longitudinally compressing the hypocotyl with approx. 0·05 N force (equivalent to 0·025 MPa for a 1·6 mm diameter hypocotyl). This relatively low compressive stress effected an increase in relative growth rates (RGR) of the hypocotyl for a period of 1-2 h, following which RGR returned to the pretreatment rate. RGR was also increased by an equivalent compressive stress treatment (0·025 MPa) for 4 h in water or in 10-10 mol l-1 IAA. These results are discussed in the context of a possible role for mechanically induced stress in the initiation and maintenance of nutational growth movements.Copyright 1994, 1999 Academic Press

Helianthus annuus, Sunflower, hypocotyl growth, mechanical stress, seedling growth, nutational growth movements, circumnutation


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