Induction of "green islands" in rice leaves by EDTA and some toxins of Pyricularia oryzae Cav

Three toxins of Pyricularia oryzae, viz. picolinic acid, tenuazonic acid and pyriculol known to induce necrotic 'blast-like' lesions on rice under normal day/night cycle have been demonstrated to produce "green islands" on host leaves in total darkness. "Green islands"...

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Bibliographic Details
Published in:Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz (1970) 1992-06, Vol.99 (3), p.286-292
Main Authors: Lokeshwari, T.S. (Madras Univ. (India). Centre for Advanced Study in Botany), Suryanarayanan, S
Format: Article
Language:English
Subjects:
Aetiologie
Agronomy. Soil science and plant productions
Biological and medical sciences
Blatt
CHELATEUR
ETIOLOGIA
ETIOLOGIE
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Fungi
Indien
Life Sciences & Biomedicine
ORYZA SATIVA
Phytopathology. Animal pests. Plant and forest protection
Picolinic acid
Plant Sciences
PYRICULARIA ORYZAE
QUELATOS
Science & Technology
SINTOMAS
Symptom
SYMPTOME
Systematics. Morphology. Development cycle. Physiology
Tenuazonic acid
Toxin
TOXINAS
TOXINE
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Summary:Three toxins of Pyricularia oryzae, viz. picolinic acid, tenuazonic acid and pyriculol known to induce necrotic 'blast-like' lesions on rice under normal day/night cycle have been demonstrated to produce "green islands" on host leaves in total darkness. "Green islands" were also induced by EDTA but the effective concentration required for induction was higher than with the three toxins. The enhanced chlorophyll retention by toxin or EDTA treatments is considered to be due to their metal chelating properties. The implication of the results in the blast disease syndrome is discussed in terms of inhibition of lipoperoxidation by virtue of the chelating properties of picolinic and tenuazonic acids towards iron ions
ISSN:0340-8159