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Burl formation in mango (Mangifera indica): a neglected tumour disorder and the structure of its secondary xylem

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Title Burl formation in mango (Mangifera indica): a neglected tumour disorder and the structure of its secondary xylem
Not Available
 
Creator Parmeshwar Lal Saran
Ravi S. Patel
Ram Prasanna Meena
Riddhi P. Vasara
Kishore S. Rajput
 
Subject Agrobacterium tumefaciens; crown gall; woody gall; secondary xylem; tyloses.
 
Description Not Available
Mango burl is an important disease affecting many mango plantations in India and
causes great loss in yield and decrease of vigour. We carried out a diagnostic survey
for burl disease (sometimes also referred to as crown gall) in different varieties
of mango (Mangifera indica L., Anacardiaceae) throughout India during 2015 and
2016. More than 500 mango genotypes were screened for disease susceptibility and
more than twenty-three mango genotypes in different parts of India were found
susceptible to this disease. Burls initiate as small tumorous growths and become
more pronounced as warty outgrowths with the increasing age of the individual
tree. Samples of burl were collected from all popular varieties from different parts
of the country and subjected to histological investigations.
The present study confirms that mango burl disease is caused by Agrobacterium
tumefaciens using evidence from the “carrot assay” and molecular identification of
the presumed causal organism. The latter was isolated and inoculated on carrot
disks to induce typical symptoms.
The xylem of the burl tissue was deformed and showed no specific orientation of
the wood cells. Dimensional details and morphology of xylem cells vary at different
positions within the burl. In a 10 cm diameter burl, the marginal portion showed
xylem cells in circular arrangement. Vessel elements and fibres were very short
while rays were relatively low and biseriate rays were observed rarely. Orientation
of the xylem tissue was lost and all three plains (i.e. transverse, tangential and radial
view) were observed in the same section. Cells from the middle portion of the burl
were isodiametric, oval to circular, thick-walled and lignified, in morphology not
dissimilar from callus tissue. Tyloses were common in all the cell types viz. fibres,
ray cells, tracheids, axial parenchyma cells, and vessel elements.
Not Available
 
Date 2021-02-02T08:50:58Z
2021-02-02T08:50:58Z
2020-02-26
 
Type Research Paper
 
Identifier Saran PL, Rajput KS, Meena RP and Vasara RP. 2020. Burl formation in mango (Mangifera indica): A neglected tumour disorder and the structure of its secondary xylem. IAWA, 41(1):85-97. DOI 10.1163/22941932-00002101.
09281541
http://krishi.icar.gov.in/jspui/handle/123456789/45200
 
Language English
 
Relation Not Available;
 
Publisher BRILL