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Investigations on host plant resistance mechanisms in brinjal (solanum melongena Linn.) to two spotted spider mite, tetranychus urticae Koch (Acari: Tetranychidae)

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Title Investigations on host plant resistance mechanisms in brinjal (solanum melongena Linn.) to two spotted spider mite, tetranychus urticae Koch (Acari: Tetranychidae)
 
Creator G. P, Mutthuraju
 
Contributor N, Srinivasa
 
Subject vegetables, planting, biological interaction, diseases, crops, yields, fruits, enzymes, tetranychus urticae, land resources
 
Description Investigations on the assessment of damage by two spotted spider mite,
Tetranychus urticae Koch on brinjal and host plant resistance related studies were carried
out during 2011 to 2013. Mean loss in brinjal fruit yield due to T. urticae damage was
21% during rabi. Assessment of mite damage on brinjal following artificial infestation
(@ 50 to 250 mites/plant) 15 to 105 days after planting revealed that 250 mites/plant,
infested at 15 days after planting resulted in maximum buildup of mites (10,532 and
8,244 mites/leaf during summer and kharif 2012, respectively) to inflict a corresponding
loss in the fruit yield of 26.09% and 38.62%.
Of 215 brinjal (Solanum melongena) entries evaluated for three seasons, 26 were
subjected to advanced screening and finally 16 entries and 7 wild types (Solanum spp.)
were grouped to represent different reactions namely, Resistant (3 entries), Moderately
Resistant (4 entries), Moderately Susceptible (7 entries) and Susceptible (2 entries). Of
wild types, S. viarum and S. mammosum were completely free from mite infestation.
Though, leaf thickness did not confer any plant resistance against mites, trichome
density in resistant entries did not support the buildup of mites. Biochemically, the
resistance in brinjal could be attributed to insignificant changes in leaf chlorophyll
content due to mite feeding; low level of sugars; high levels of proteins, phenols, proline,
peroxidases and phenylalanine ammonia lyase. Subsequent increase in the levels of
phenols, proline and activity of peroxidases & phenylalanine ammonia lyase following
mite feeding could be an induced reaction in the resistant entries, namely, Pusa Upkar
and Manjari Gota. Supportingly, on these resistant entries mites manifested longer
developmental period, shorter female longevity, low fecundity and low female progeny
compared to susceptible entries, namely, MG Spiny-10 and Purple Oblong. RAPD
analysis with 40 primers segregated Solanum entries into two main clusters.
 
Date 2016-05-20T14:16:27Z
2016-05-20T14:16:27Z
2013-08-30
 
Type Thesis
 
Identifier Th-10621
http://krishikosh.egranth.ac.in/handle/1/66175
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences, Bengaluru