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Biochemical studies in relation to mango malformation

KrishiKosh

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Title Biochemical studies in relation to mango malformation
M Sc
 
Creator OM PRAKASH SINGH
 
Contributor K. Usha
 
Subject mangoes, enzymes, diseases, planting, fruits, phenols, fungi, aromatic compounds, biological phenomena, antioxidants
 
Description T-8345
Mango malformation is a serious threat to mango cultivation in various
countries. Economic losses of up to 60 percent have been reported in different
commercial varieties of mango in India. The etiology of malformation has been a
contentious issue, and a wide range of biotic and abiotic factors have been reported to
cause the disease, but recently only Fusarium mangiferae has been shown to cause
mango malformation. Response of different mango varieties to Fusarium mangiferae
may vary. Conventional breeding approach in mango utilizing the malformation
resistant varieties is not only time consuming, cumbersome but the probability of
getting desirable result is very low. The natural resistance of plants to diseases is
based not only on preformed defenses, but also on induced mechanisms. It is evident
from literature that different biochemical compounds participate in plant defense as a
component of both the response and signaling process that ultimately limits disease
progression. The present investigations on Biochemical studies in relation to mango
malformation were therefore undertaken at Division of Fruits and Horticultural
Technology, IARI, New Delhi. Fifty mango varieties available in the collection block
of the Division were screened to group varieties having different degrees of resistance
to malformation. Mango leaves (1-2 months old, and 3-4 months old) were collected
from different mango varieties showing different degrees of resistance to mango
malformation and various biochemical parameters namely total phenols, total
antioxidants, polyphenol oxidase (PPO), lipoxiginase (LOX) and antioxidant enzymes
namely peroxidase, Super Oxide dismutase and Catalast activity were assessed using
standard procedures. Phenotyping of mango varieties revealed that different varieties
had different degree of resistance to malformation. While mango cultivars Machali,
Mahamood Vikara, and Swarnika were highly susceptible, Bhadauran and Ellaichi
were resistant to malformation. Assessment of mango varieties for different defense
responding biochemical compounds revealed significantly higher levels of PPO, LOX,
peroxidase and catalase activity in mango varieties resistant to malformation when
compared to susceptible varieties. PPO and catalase activity showed positive
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correlation with the extent of malformation and can be used biochemical markers for
developing varieties resistant to mango malformation.
 
Date 2016-10-24T10:12:28Z
2016-10-24T10:12:28Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81439
 
Format application/pdf
 
Publisher IARI,DIVISION OF FRUITS AND HORTICULTURAL TECHNOLOGY