Etude du pH et du pouvoir tampon des aiguilles de sapins (Abies alba L.) et d'épicéas (Picea abies L.) dépérissants. Application en symptomatologie ?

Garrec, Jean-Pierre; Richardin, I.; Maout, L. Le; Rose, Cédric; Gérard, B.; Mathieu, Yves

doi:10.1051/forest:19890105

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Most authors believe that decline and simulated pollution induces premature and accelerated ageing (Cape 1986;Gunthardt 1987;Garrec et al 1989b). Some of our results would tend to confirm this hypothesis, e.g., even to odd chain ratios for spruce and ivy (Figs.…”

Section: Discussionsupporting

confidence: 63%

Modifications in the alkane composition of cuticular waxes from spruce needles (Picea abies) and ivy leaves (Hedera helix) exposed to ozone fumigation and acid fog: comparison with needles from declining spruce trees

Kerfourn¹,

Garrec²

1992

Can. J. Bot.

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KERFOURN, C., and GARREC, J. P. 1992. Modifications in the alkane composition of cuticular waxes from spruce needles (Picea abies) and ivy leaves (Hedera helix) exposed to ozone fumigation and acid fog: comparison with needles from declining spruce trees. Can. J. Bot. 70: 861-869. Our study on the chemical composition of cuticular waxes showed that the configuration of alkane homologues, in needles from declining spruce trees as well as in artificially polluted ivy leaves and spruce needles, presented a significant shift towards lower molecular weight chains. On the contrary, in both materials ageing was characterized by increasing chain lengths. This work emphasizes the importance of the short and long carbon chains as representative parameters of chemical alteration of cuticular waxes. As far as alkanes are concerned, pollutants may change cuticular wax composition by acting on sites of their metabolic biosynthesis rather than through a direct passive chemical contact effect. KERFOURN, C., et GARREC, J. P. 1992. Modifications in the alkane composition of cuticular waxes from spruce needles . . ..(Picea abies) and ivy leaves (Hedera helix) exposed to ozone fumigation and acid fog: comparison with needles from . . declining spruce trees. Can. J. Bot. 70 : 861-869. L'Ctude de la composition chimique des cires cuticulaires montre que le dCpCrissement chez l'CpicCa, tout comme les simulations de pollution chez 1'CpicCa et le lierre, se manifestent par un raccourcissement gCnCral des chaines d'alcanes. Le vieillissement par contre, se traduit chez les deux matCriels vCgCtaux par un allongement croissant de la longueur des chaines. D'une f a~o n gCnCrale, cette Ctude sur les differents homologues des alcanes met en Cvidence l'importance du rapport des chaines courtes aux chaines longues, comme paramktre representatif de llaltCration chimique des cires cuticulaires. Nos rCsultats concernant les alcanes, sont en faveur d'une action metabolique des polluants sur diffkrentes Ctapes de la biosynthbse des cires cuticulaires, plut6t que d'une simple reaction chimique h leur contact.

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Section: Discussionsupporting

confidence: 63%

Modifications in the alkane composition of cuticular waxes from spruce needles (Picea abies) and ivy leaves (Hedera helix) exposed to ozone fumigation and acid fog: comparison with needles from declining spruce trees

Kerfourn¹,

Garrec²

1992

Can. J. Bot.

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“…Se siguió el método descrito por Garrec (1989), con algunas modificaciones. Se homogeneiza 1 g de muestra con 5 ml de agua ultrapura en un tubo con Ultraturrax, a velocidad 7 durante 10 s; luego se añaden otros 5 ml de agua y se homogeneiza de nuevo.…”

Section: Ph Y Poder De Amortiguaciónunclassified

Nutrients, buffer capacity, iminoacids and phenolic compounds as chemical parameters to indicate fire damages in Pinus pinaster trees

et al. 1998

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Changes in the level of some chemical parameters are researched in needles, juvenile needles and roots of P. pinaster trees caused by fire impact of three fire front linear intensities: 146 Kw.m-1 (QII), 357 (QI), and 423 (QIII) Kw.m-1, in Pontevedra, Galicia, NW of Spain. The most important variations are observed in needles. The free protocatechuic acid is a very sensitive parameter; it decreases to 48 p. 100 in QII, 40 p. 100 in QI and 68 p. 100 in QIII in relation to the control plot. Other good indicator is the free p-hidroxybenzoic acid, that falls in QII andQI to 61 p. 100 and 78 p. 100 respectively, and increases to 96% in the most intensity burned plot, QIII. The phosphorus level decreases in QII and QIII a 26 and 47 p. 100 respectively. The highest intensity fire (QIII) induces changes in a lot of parameters, other different from those in needles. The values of potassium, zinc and buffer capacity decrease and the values of calcium, copper, iron, astringency, total polyphenols, condensed tannins, free L-proline, free gallic acid, esterified protocatechuic and syringic acid increase. In roots, zinc is a good indicator. It descends in all cases researched. The level of total polyphenols falls in QII and QIII and free protocatechuic acid increases in QIII. In juvenile needles, except buffer capacity that decreases in QIII, we do not observe significative changes in other parameters.

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Forest decline

Innes

1992

Progress in Physical Geography: Earth and Environment

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Forest decline is a major environmental issue today. However, there are numerous examples of past declines in the condition of individual species within forests or of the entire forests themselves. Many of these declines are natural, being brought about by a variety of factors, including stand dynamics, pests and diseases. The emphasis that has been placed on air pollution in recent declines does not appear to be justified, although air pollution has undoubtedly brought about the decline of forests at some locations. Much of the literature exaggerates the extent of the decline in forest health in Europe. The overestimation of its extent has occurred because of the assessment techniques that are used: these are unable to distinguish trees that have recently declined from those that have always been in poor condition. In addition, the techniques that are most frequently used are nonspecific and no cause can be readily attributed to the defoliation that has been observed.

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Etude du pH et du pouvoir tampon des aiguilles de sapins (Abies alba L.) et d'épicéas (Picea abies L.) dépérissants. Application en symptomatologie ?

Cited by 3 publications

References 11 publications

Modifications in the alkane composition of cuticular waxes from spruce needles (Picea abies) and ivy leaves (Hedera helix) exposed to ozone fumigation and acid fog: comparison with needles from declining spruce trees

Modifications in the alkane composition of cuticular waxes from spruce needles (Picea abies) and ivy leaves (Hedera helix) exposed to ozone fumigation and acid fog: comparison with needles from declining spruce trees

Nutrients, buffer capacity, iminoacids and phenolic compounds as chemical parameters to indicate fire damages in Pinus pinaster trees

Forest decline

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