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Etude de la rythmicité de la croissance en épaisseur et de la formation des faux-cernes chez de jeunes plants de chêne pédonculé et de chêne-liège cultivés en conditions favorables : rôle des feuilles

Abstract : A kinetic study of growth, notably of radial growth, and an histological study of wood and cambial region were carried out in young seedlings of Quercus robur and Quercus suber grown in favourable conditions, where they were regularly flushing. The two species presented a rhythmic radial growth of the stem, resuIting from a rhythmic cambial activity. This rhythm was synchronous with the apical growth rhythm. The increase in diameter of stem and in length of leaves was in opposition, the minima of the former corresponding to maxima of the latter and vice versa. At each apical growth cycle, a false-ring was formed in wood throughout the stem. False-rings were characterized by periodic changes of the intensity of lignification, probably in the deposition of gaïacyl lignins, but not in the deposition of syringyl lignins. There was a close relationship between false-ring area and photosynthesizing area. Leaves played an essential role in determining radial growth pattern and in the appearance of false-rings. In Quercus robur, leaf blades at the stage of rapid growth determined the decreasing phase (up to the arrest) of the radial growth rhythm, while leaf blades at an early stage (5-9 mm length) determined the deposition of lignins highly reactive to Phloroglucinol-HCl, but did not act on the deposition of syringyl lignins (test of Mäule). Both species of oak trees studied behaved in the same way as for the rythmicity of radial growth and the formation of false-rings, but the resumption of their radial growth after a winter rest had different patterns. Indeed, it spread basipetally in Quercus robur, and simuItaneously in the whole stem in Quercus suber.
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http://docnum.univ-lorraine.fr/prive/SCD_T_1999_0261_MANSOUR.pdf
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https://hal.univ-lorraine.fr/tel-01747266
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Submitted on : Thursday, March 29, 2018 - 10:56:05 AM
Last modification on : Tuesday, January 12, 2021 - 2:19:32 PM

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  • HAL Id : tel-01747266, version 1

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Anas Mansour. Etude de la rythmicité de la croissance en épaisseur et de la formation des faux-cernes chez de jeunes plants de chêne pédonculé et de chêne-liège cultivés en conditions favorables : rôle des feuilles. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 1999. Français. ⟨NNT : 1999NAN10261⟩. ⟨tel-01747266⟩

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