H-24: moderately leaf curl resistant variety of tomato (Lycopersicon esculentum Mill.)

H-24: moderately leaf curl resistant variety of tomato (Lycopersicon esculentum Mill.)

2000

A:PS

Leaf curl caused by Indian tomato leaf curl virus (TLCV) is one of the most serious diseases of tomato, especially in the Indian sub-continent and many other Asian countries. Utilizing a conventional breeding approach, we were able to develop several resistant derivatives from the cross L. esculentum cv. Sel-7 x L. hirsutum f. glabratum 'B 6013' via modified backcross-pedigree selection. This paper deals with the performance of one such derivative, namely H-24, with respect to yield and reaction to TLCV under field and artificial inoculation conditions. Disease symptoms on the plants were recorded after expression of symptoms, and after that percent disease incidence (PDI), disease severity, coefficient of infection (CI) and days to symptoms appearance on susceptible plants were worked out. Mean PDI values of H-24, and the susceptible controls Sel-7 and Punjab Chhuhara, were 18.83%, 50.23% and 67.57%, respectively. Similarly, symptoms severity and CI values were also much lower in H-24 (0.28 and 1.51, respectively). The results of artificial inoculation showed that mean PDI (37.49%), symptoms severity (0.54) and CI (5.20) were significantly less in H-24. Further, average yield of H-24 was maximum (339.8 q/ha) followed by Sel-7 (317.0 q/ha) and Punjab Chhuhara (307.7 q/ha). It is suggested that H-24 can be grown in leaf curl infested area and can be used as tolerant breeding line.

v.27(2):117-120, VEGETABLE SCIENCE

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