Genetic analysis of root-knot nematode (Meloidogyne incognita) resistance in carrot (Daucus carota L.)

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Research Articles | Published:

E-ISSN: 2229-4473.
Website: www.vegetosindia.org
Pub Email: contact@vegetosindia.org
DOI: 10.1007/s42535-024-00918-z
First Page: 978
Last Page: 984
Views: 1788

Keywords: Additive, Carrot, Chi-square, Non-significance, Single recessive gene


Abstract

The genetics analysis for a specific characteristic is critical to monitor plant health along with developing and testing novel, cost-effective, and long-term management. Root knot nematode by formation of galls causes a significant yield lossess in tropical carrots. Severe infestations result in forking or fanging of the roots, reducing their marketability. In carrot production, genetic resistance considerably reduce the requirement for broad-spectrum soil fumigants. The genetics and nature of root-knot nematode resistance in carrot were identified using root gall index in the plastic bag settings using a pure culture of root-knot nematode. In order to carry out this research, we used one immune parent (Acc-88) and one highly susceptible parent (Acc-113B) to produce F1, F2, BC1P1 and BC1P2 progenies. In cross between Acc-113B x Acc-88, chi-square analysis indicated that root-knot nematode (Meloidogyne incognita) resistance is controlled by a recessive gene. Further, the non-significant scaling test in the cross confirmed the absence of epistatic interaction in this study. By evaluating three parameters [m, d, and h] through generation mean analysis, the results suggested that cross had a predominance of additive types. All of the above results showed that it might be possible to improve resistance to root-knot nematodes by backcross breeding.

Additive, Carrot, Chi-square, Non-significance, Single recessive gene


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Author Information

Division of Vegetable Crops, ICAR-Indian Institute of Horticultural Research, Bengaluru, India