Nachweis erhöhter Äthylengehalte in der Bodenluft eines von der Verdichtungschlorose befallenen Rebberges
DOI:
https://doi.org/10.5073/vitis.1981.20.320-328Abstract
Periodische Untersuchungen der Bodenluft einer chlorosekranken Rebparzelle, deren Boden verdichtet war, erbrachten im Vergleich zu einer unmittelbar benachbarten gesunden Parzelle häufiger hohe Äthylengehalte. In einem Großteil der Gasproben wurden Äthylenkonzentrationen über 1 ppm gemessen, die als wachstumshemmend angesehen werden.
Im Gegensatz zu den meisten anderen Nährstoffen kann Eisen nur in der Zellteilungs- und Streckungszone unmittelbar hinter der Wurzelspi<tze aufgenommen werden. Es wird postuliert, daß die äthyleninduzierte Hemmung des Wurzelspitzenwachstums indirekt eine verminderte Eisenaufnahme durch die Wurzel bewirkt. Sobald ein großer Eisenbedarf auftritt, meist bei beginnender Gescheinsentwicklung, entsteht ein temporärer Eisenmangel, der in der Folge zur Chlorose führt.
Evidence of increased ethylene content in the soil air of a vineyard with compaction-induced chlorosis
Ethylene at concentrations known to affect reet growth was found in the soil air of a chlorotic vineyard with compacted soil. Concentrations above 1 ppm were significantly more frequent in the chlorotic vineyard in comparison to the healthy field just beside. In contrast to most of the other nutrients, iron can be taken up only by growing root tips. lt is postulated that the ethylene-induced inhibition of root growth reduces the iron uptake. As seen as the plant needs a great amount of iron, i.e. during an intense growth of the shoots at the beginning ef inflorescence development, a temporary iron stress leads to the appearence of chlorosis.
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