International Journal of Agricultural Sciences

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Evaluation of Tomato Hybrids for Resistance to Root Knot Nematode (Meloidogyne incognita)


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1 Tamil Nadu Agricultural University, Coimbatore (T.N.), India
     

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Three new tomato (Solanum lycopesicum L.) hybrids were evaluated for their reaction to the ischolar_main knot nematode, Meloidogyne incognita, in comparison with their parents and resistant and susceptible check cultivar/hybrid in three different geographical locations in Tamil Nadu, India. The biochemical traits of the tested cultivars and hybrids were also compared. The resistant parent HN2 showed less ischolar_main knot nematode females per gram of ischolar_mains, number of eggmasses per gram of ischolar_mains and ischolar_main knot index. The newly synthesized tomato hybrid HN2×CLN 2123A registered the least number of ischolar_main knot nematode females per gram of ischolar_mains, number of eggmasses per gram of ischolar_mains and ischolar_main knot index. The reaction to the nematode of the hybrid was at par with the resistant check Hisar Lalit. Also, the hybrids registered the greatest fruit yield per plant, plant height, number of branches per plant, number of fruits per plant and ischolar_main length. The biochemical traits phenol content and ischolar_main ascorbic acid content and the enzymes peroxidase, IAA oxidase and acid phosphatase activity were greatest in the hybrid HN2×CLN 2123A. These biochemical traits excelled both parents, which would indicate the role of over dominant genes.

Keywords

Solanum lycopersicum, Evaluation-Root-Knot Nematode, Resistance.
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  • Evaluation of Tomato Hybrids for Resistance to Root Knot Nematode (Meloidogyne incognita)

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Authors

K. Sundharaiya
Tamil Nadu Agricultural University, Coimbatore (T.N.), India
M. Karuthamani
Tamil Nadu Agricultural University, Coimbatore (T.N.), India

Abstract


Three new tomato (Solanum lycopesicum L.) hybrids were evaluated for their reaction to the ischolar_main knot nematode, Meloidogyne incognita, in comparison with their parents and resistant and susceptible check cultivar/hybrid in three different geographical locations in Tamil Nadu, India. The biochemical traits of the tested cultivars and hybrids were also compared. The resistant parent HN2 showed less ischolar_main knot nematode females per gram of ischolar_mains, number of eggmasses per gram of ischolar_mains and ischolar_main knot index. The newly synthesized tomato hybrid HN2×CLN 2123A registered the least number of ischolar_main knot nematode females per gram of ischolar_mains, number of eggmasses per gram of ischolar_mains and ischolar_main knot index. The reaction to the nematode of the hybrid was at par with the resistant check Hisar Lalit. Also, the hybrids registered the greatest fruit yield per plant, plant height, number of branches per plant, number of fruits per plant and ischolar_main length. The biochemical traits phenol content and ischolar_main ascorbic acid content and the enzymes peroxidase, IAA oxidase and acid phosphatase activity were greatest in the hybrid HN2×CLN 2123A. These biochemical traits excelled both parents, which would indicate the role of over dominant genes.

Keywords


Solanum lycopersicum, Evaluation-Root-Knot Nematode, Resistance.

References