Effect of Ethylene on the Oxidative Decarboxylation Pathway of Indole-3-Acetic Acid

Gören, R.; Winer, L.; Riov, Joseph

doi:10.1007/978-94-011-4453-7_46

Cited by 2 publications

(3 citation statements)

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“…Riov and S. Meir, unpublished data), and this may explain the stimulation of IAA catabolism. Similarly, Goren et al (1999) have recently reported that ethylene stimulated both the accumulation of H 2 O 2 and the oxidative decarboxylation of IAA in citrus tissues.…”

Section: Discussionmentioning

confidence: 68%

“…This indicates that the AZ is also a target tissue for the reduction of the free IAA content by chilling. It is noteworthy that in citrus, the stimulation of oxidative decarboxylation of IAA by ethylene was much more pronounced in midrib tissue than in the leaf blade (Goren et al 1999). These data, as well as the findings presented in Fig.…”

Section: Discussionmentioning

confidence: 97%

“…The exact mechanism by which oxidative stress reduces free IAA content and transport capacity is not yet clear, with the exception of the involvement of oxidative decarboxylation of IAA in the process. This reaction is catalyzed by peroxidase and requires H 2 O 2 , at least in some species (Bandurski et al 1995, Goren et al 1999. Since H 2 O 2 has been reported to accumulate following various stresses, including chilling (Prasad et al 1994), increased oxidative decaboxylation of IAA is to be expected in stressed tissues or whenever H 2 O 2 accumulates.…”

Section: Discussionmentioning

confidence: 99%

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Chilling‐induced leaf abscission of Ixora coccinea plants. II. Alteration of auxin economy by oxidative stress

Michaeli¹,

Riov²,

Philosoph‐Hadas³

et al. 1999

Physiologia Plantarum

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Chilling‐induced leaf abscission of ixora (Ixora coccinea) plants was almost completely inhibited by α‐naphthaleneacetic acid (NAA), even in the presence of exogenous ethylene, which enhanced the chilling effect on leaf abscission. Chilling reduced free indoleacetic acid (IAA) content, quantified immediately after chilling, in the abscission zone (AZ) and leaf blade. Free IAA content in chilling‐treated plants continued to decrease gradually with time after chilling. Application of the antioxidant butylated hydroxyanisole (BHA) before or after chilling not only prevented the post‐chilling decline in free IAA content, but also restored free IAA level during 6–48 h of the post‐chilling period almost to the control level. No significant effect of chilling on the endogenous content of ester‐ and amide‐conjugates of IAA or the metabolism of exogenous labeled IAA were observed. Chilling enhanced the decarboxylation of IAA, particularly in the AZ tissue. Auxin transport capacity was significantly inhibited by chilling, and this effect was counteracted by BHA applied before chilling. The data indicate that chilling reduces free IAA content in the AZ, an effect that may lead to increased sensitivity to ethylene. The chilling‐induced reduction in IAA content in the AZ seems to result, at least in part, from increased IAA decarboxylation and reduced auxin transport capacity. These processes seem to be triggered by the oxidative stress imposed on the tissues by chilling.

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Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 97%