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Morphological, Pathogenic and Molecular Characterizations of Alternaria Species Causing Early Blight of Tomato in Northern India

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Title Morphological, Pathogenic and Molecular Characterizations of Alternaria Species Causing Early Blight of Tomato in Northern India
Not Available
 
Creator Loganathan, M., Venkataravanappa V., S. Saha, Rai, A.B., Tripathi S., Rai, R.K., Pandey, A.K., Chowdappa P
 
Subject Early blight Alternaria solani Alternaria alternata Tomato
 
Description Not Available
Early blight disease samples were collected
from six different states of India. Seventeen different isolates
of Alternaria spp were obtained in pure culture which
were designated as PB-2, PB-4, PB-13, PB-17, PB-19,
HR-12, HR-44, HR-62, MP-6, MP-7, JT-4, JT-11, UP-7,
UP-10, UP-15, UP-20 and RJ-T-1. Characterization based
on culture colour and conidial dimensions (conidial length
and breadth, and beak length) indicated that no distinguished
variation of the isolates was observed on the colour
parameters. Although, a wide variation was observed in the
length of conidia and beak, no significant difference was
observed in conidial breadth except RJ-T-1. Among the
isolates, conidial length of five isolates viz., HR-12, UP-7,
UP-10, UP-15 and RJ-T-1 ranged from 80 to 97 lm
whereas others were of significantly lesser size
(30–51 lm). Similarly, significant difference was observed
in beak length. The PCR amplification of the fungal DNA
using universal primers ITS1 and ITS4 and sequencing
indicated that, out of 17 isolates, 12 (JT-4, JT-11, HR-62,
HR-44, PB-2, PB-4, PB-13, PB-17, PB-19, UP-20, MP-6
and MP-7) were closely matching with A. alternata
(JX993756) and five isolates (HR-12, UP-7, UP-10, UP-15
and RJ-T-1) with A. solani (JF796068). Further, pathogenicity
test on tomato revealed that both A. alternata and A.
solani isolates were of virulent category indicating that
former is also an incitant of early blight in northern India.
Not Available
 
Date 2019-03-29T08:05:49Z
2019-03-29T08:05:49Z
2016-01-01
 
Type Article
 
Identifier 4
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/17784
 
Language English
 
Relation Not Available;
 
Publisher Not Available