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Trichome and biochemical basis of resistance against Tuta absoluta in tomato genotypes

Published online by Cambridge University Press:  04 February 2019

Vaddi Sridhar ,
Avverahally Thammanna Sadashiva ,
Vala Keshava Rao ,
Padavala Swathi  and
Hanamant Shivalingappa Gadad
Vaddi Sridhar*
Affiliation:
Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research (ICAR-IIHR), Bengaluru, Karnataka 560089, India
Avverahally Thammanna Sadashiva
Affiliation:
Division of Vegetable Sciences, ICAR-Indian Institute of Horticultural Research (ICAR-IIHR), Bengaluru, Karnataka 560089, India
Vala Keshava Rao
Affiliation:
Division of Physiology and Biochemistry, ICAR-Indian Institute of Horticultural Research (ICAR-IIHR), Bengaluru, Karnataka 560089, India
Padavala Swathi
Affiliation:
Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research (ICAR-IIHR), Bengaluru, Karnataka 560089, India
Hanamant Shivalingappa Gadad
Affiliation:
Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research (ICAR-IIHR), Bengaluru, Karnataka 560089, India
*
*Corresponding author. E-mail: vaddi_sridhar@rediffmail.com
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Abstract

South American tomato moth, Tuta absoluta, a serious pest of tomato (Solanum lycopersicum) in tropics and subtropics, is rapidly spreading world over. Twenty one wild/cultivated/advanced breeding lines of tomato were screened for resistance to T. absoluta under greenhouse conditions (choice bioassay) and promising genotypes were evaluated further for their antibiosis activity through no choice bioassay under in-vitro conditions. From 21 genotypes screened, six wild accessions viz., S. pennellii (LA 1940); S. chilense (LA 1963); S. arcanum (LA 2157); S. lycopersicum (LA1257) and S. corneliomulleri (LA 1292, LA1274) were relatively resistant to T. absoluta based on mean percent damage and were further studied under in-vitro conditions. These genotypes recorded relatively more larval mortality, prolonged larval and pupal duration with reduced adult emergence of T. absoluta. Among these six genotypes, S. pennellii (LA-1940) showed resistance both under choice and no choice bioassays with higher number of type IV trichomes, highest total flavonoids and phenols. In general, glandular trichomes (GTs) (type I, IV, VII) showed negative correlation in different genotypes of tomato with reference to larval number/plant, percent damage and adult activity, whereas type V (non-GTs) showed negative correlation with number of larvae/plant.

Keywords

breedingchoice bioassayglandular trichomeslarval mortality
Type
Short Communication
Information
Plant Genetic Resources , Volume 17 , Issue 3 , June 2019 , pp. 301 - 305
Copyright
Copyright © NIAB 2019 

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