Abstract
The winter rape hypocotyls grown in darkness or in light were found to differ markedly both in the elongation rate and in the sensitivity to desiccation. Light arrested the elongation of hypocotyls and markedly increased their resistance to desiccation. It was found that the former effect was due to 2 factors: better avoidance of water stress and higher desiccation tolerance in the light-treated tissue. Comparison of WSD (waret saturation deficit) and water potential developed by 5 day-old hypocotyls subjected to different degrees of desiccation indicates that better water relations in the light-grown tissues might be due to the decreased elasticity of the cell walls(e.g. — to the higher turgor pressure of the cell).
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