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Drechslerella dactyloides and Dactylaria brochopaga mediated structural defense in tomato plants pre-challenged with Meloidogyne incognita

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Title Drechslerella dactyloides and Dactylaria brochopaga mediated structural defense in tomato plants pre-challenged with Meloidogyne incognita
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Creator Udai B. Singha,⁎ , Shailendra Singha,1 , Deepti Malviyaa,1 , Rajan Chaurasiab,1 , Pramod K. Sahua,b , Sushil K. Sharmaa , A.K. Saxenaa
 
Subject Meloidogyne incognita Drechslerella dactyloides Dactylaria brochopaga Induced systemic resistance Root-knot disease
 
Description Not Available
The present study was undertaken with the objectives to study Drechslerella dactyloides NDAd-05 and Dactylaria
brochopaga NDDb-15 mediated induction of structural defense responses leading to lower disease development
and promoting growth in tomato pre-challenged with Meloidogyne incognita. The potential strains D. dactyloides
NDAd-05 and D. brochopaga NDDb-15 were taken from Plant-Microbe Interaction and Rhizosphere Biology Lab,
ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan, India. In vitro
root colonization assay was performed using D. dactyloides NDAd-05 and D. brochopaga NDDb-15 in sand:soil
culture (2:1) and significant tomato root colonization by NDAd-05 and NDDb-15 was recorded. The study
elucidated multifarious effects of D. dactyloides NDAd-05 and D. brochopaga NDDb-15 when inoculated either
individually or in combination in tomato plants pre-challenged with M. incognita. Additionally, D. dactyloides
NDAd-05 and D. brochopaga NDDb-15 increased antioxidant as well as biocontrol activities significantly in to mato against M. incognita. Microscopic visualization of H2O2 and superoxide radicals in tomato leaves further
corroborated the above findings. Further, inoculation of D. dactyloides NDAd-05 and D. brochopaga NDDb-15
activated the phenylpropanoid pathway in roots leading to increase cell wall lignifications and pectin deposition
in tomato roots in addition to direct trapping and parasitizing of juveniles and adults of M. incognita. From the
results it can be concluded that increased cell wall lignifications and pectin deposition probably restricted the
entry of nematodes and ultimately decreased the M. incognita population in tomato roots. It was also observed
that plants treated with bioagents individually or in combination modulated the phenotypical alterations and
assisted plant growth promotion. This might be due to the interaction-dependent modulation of physio-bio chemical pathways in the tomato plants which ultimately reduced the inoculum potential and disease intensity
of M. incognita.
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Date 2024-06-24T16:19:33Z
2024-06-24T16:19:33Z
2020-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/83746
 
Language English
 
Relation Not Available;
 
Publisher Not Available