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Turgor pressure and elongation growth in developing sunflower hypocotyls

Turgor pressure and elongation growth in developing sunflower hypocotyls

Journal of Plant Physiology 141(6): 757-758

The average turgor pressure of hypocotyl cells of 2-day-old etiolated sunflower seedlings (Helianthus annuus L.) was 0.59 MPa. Turgor pressure decreased during acceleration of growth in darkness and reached a value of 0.5 MPa at days 4 and 5 after sowing (linear phase of growth). Cessation of hypocotyl elongation at day 6 was accompanied by a 40% drop in cell turgor pressure. We suggest that this loss of cell turgor is the cause of the decline in hypocotyl growth in darkness. Irradiation of the etiolated seedlings with white light inhibited hypocotyl growth, but turgor pressure was unaffected.

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Accession: 002537112

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DOI: 10.1016/s0176-1617(11)81587-7

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