PJB-2007-265
GENETIC RESISTANCE AND SELECTION RESPONSE IN MOTHBEAN AGAINST YELLOW MOSAIC VIRUS DISEASE
MUHAMMAD YAQOOB1, A.M. HAQQANI2 AND NAJIBULLAH3
Abstract
Mothbean is severely attacked by Yellow Mosaic Virus (YMV) disease. The virus is considered to be transmitted through vector whiteflies (Bemisia tabaci Genn) a sucking insect of Vigna group. The only way to overcome this problem is development of disease resistant varieties. The local land races are highly susceptible to this dread disease. To purify the available germ plasms accessions a country-wide survey was conducted and some 66 lines of mothbean including the accession from PGRI, NARC, Islamabad were collected for screening against YMV. All the 66 germ plasm accession were planted at Agricultural Research Institute, D.I.Khan during 2004. Most of the lines were totally destroyed by YMV. Some desirable tolerant, moderately tolerant, resistant and highly resistant plant were selected. The seed thus obtained was again planted during next year 2005 along with susceptible checks for confirmation of host plant resistance and study of selection response of mothbean against YMV. The disease data were recorded on 1-9 rating scale. The observations revealed that there exists greater genetic variability in mothbean lines against their response to yellow mosaic virus. The results further revealed that selection response was quite positive. The lines showing resistance in previous year had again shown the resistance and vice versa.
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