STUDY ON GERMINATION, PENETRATION AND DEVELOPMENT OF ALTERNARIA ALTERNATA, CAUSAL AGENT OF BROWN SPOT AND BLACK ROT DISEASES, ON CITRUS LEAVES AND FRUITS IN NORTH OF IRAN

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DEHPOUR JOUYBARI ABAS ALI; MAJD AHMAD; ALAVI S.V.

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Journal: IRANIAN JOURNAL OF BIOLOGY Year:2009 | Volume:22 | Issue:1 Page(s): 161-169

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Title

STUDY ON GERMINATION, PENETRATION AND DEVELOPMENT OF ALTERNARIA ALTERNATA, CAUSAL AGENT OF BROWN SPOT AND BLACK ROT DISEASES, ON CITRUS LEAVES AND FRUITS IN NORTH OF IRAN

Author(s)

DEHPOUR JOUYBARI ABAS ALI | MAJD AHMAD | ALAVI S.V. | Issue Writer Certificate

Keywords

ALTERNARIA ALTERNATAQ2

CITRUSQ3

ELECTRON MICROSCOPYQ3

CITRUS BROWN SPOTQ3

THOMSON NAVEL BLACK ROTQ3

Abstract

Alternaria fungi cause two different diseases on CITRUS in Mazandaran province, North of Iran: Alternaria brown spot of tangerines and their hybrids, and Alternaria black rot of the Navel orange fruits. In this study, infected tissues collected from infected leaves, fruits and young stems of the plants. The tissues were cuted to (2x2 mm) pieces and fixed over night at gluteraldehyde and phosphate buffer, post fixation was done with osmium tetroxide, after lyophilization, the specimens were coated with gold and then studied using a SEM (LEO 435). Multiple germ-tubes developed randomly from each conidium and grew in any direction across the leaf and fruit skin surfaces. The hyphal penetration in the plant surface, whether directly through the epidermis or via stomata occured with or without the appressoria formation. The present study showed that occurrence of the infection was through stomata and direct penetration. Hyphal penetration continued through of the sub stomata cavity, and then some of hyphal branches grew in the intercellular space of mesophyll tissue. The hyphal products, specially toxins (HST and NHST), caused cell and cell wall damages. None of the hyphal branches were penetrated in to oil glands of the leaves and specially of the fruits. Based on the observations, the oil gland componements have had inhibitor roles on the hyphal penetration and development.

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APA: Copy

DEHPOUR JOUYBARI, ABAS ALI, MAJD, AHMAD, & ALAVI, S.V.. (2009). STUDY ON GERMINATION, PENETRATION AND DEVELOPMENT OF ALTERNARIA ALTERNATA, CAUSAL AGENT OF BROWN SPOT AND BLACK ROT DISEASES, ON CITRUS LEAVES AND FRUITS IN NORTH OF IRAN. IRANIAN JOURNAL OF BIOLOGY, 22(1), 161-169. SID. https://sid.ir/paper/21421/en

Vancouver: Copy

DEHPOUR JOUYBARI ABAS ALI, MAJD AHMAD, ALAVI S.V.. STUDY ON GERMINATION, PENETRATION AND DEVELOPMENT OF ALTERNARIA ALTERNATA, CAUSAL AGENT OF BROWN SPOT AND BLACK ROT DISEASES, ON CITRUS LEAVES AND FRUITS IN NORTH OF IRAN. IRANIAN JOURNAL OF BIOLOGY[Internet]. 2009;22(1):161-169. Available from: https://sid.ir/paper/21421/en

IEEE: Copy

ABAS ALI DEHPOUR JOUYBARI, AHMAD MAJD, and S.V. ALAVI, “STUDY ON GERMINATION, PENETRATION AND DEVELOPMENT OF ALTERNARIA ALTERNATA, CAUSAL AGENT OF BROWN SPOT AND BLACK ROT DISEASES, ON CITRUS LEAVES AND FRUITS IN NORTH OF IRAN,” IRANIAN JOURNAL OF BIOLOGY, vol. 22, no. 1, pp. 161–169, 2009, [Online]. Available: https://sid.ir/paper/21421/en

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