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Published in Crop Sci 18:613-615 (1978)
© 1978 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Resistance to Pea Seed-borne Mosaic Virus in Lentils1

N. I. Haddad, F. J. Muehlbauer, and R. O. Hampton2

The USDA collection of lentils (Lens culinaris Medic.) was screened for resistance to pea seed-borne mosaic virus (PSbMV); PI lines 212610, 251786, 297745, and 368648 were found to be immune. After inoculation and an incubation period the virus was not recoverable by local lesion assay from the resistant lines, nor did the ,resistant lines develop symptoms or transmit the virus through seeds from inoculated plants. Two immune lines were used to study the inheritance of resistance. The F2 progenies of crosses between PI 368648 and the susceptible cultivars ‘Tekoa’ and ‘Precoz’ segregated in a 3:1 ratio of susceptible to resistant plants, indicating that resistance was conferred by a single recessive gene. All F2 progenies of a cross between PI 368648 and PI 212610 were 100% resistant, which indicated that the same recessive gene was present in the two sources. We propose that the gene symbol sbv be used to designate resistance to PSbMV in lentils. The PSbMV-infected plants could be identified under a range of temperatures. However, symptom expression was more severe at 24 and 30 C than at 18 C. Symptoms at all temperatures included stunting, leaf curling, and leaf size reduction. Vein clearing, tip bending, and tip necrosis occurred at 24 and 30 C, whereas, premature plant death only occurred at 30 C.

Key Words: Host-plant resistance • Lens Culinaris Medic • Temperature effects

1 Cooperative investigation of the SEA, USDA and the Agric. Res. Ctr., Washington State Univ., Pullman, WA 99164. Scientific Paper No. 4990. Project 3790.

2 Respectively, graduate research assistant, College of Agriculture, Washington State Univ., Pullman, WA 99164, research geneticist, SEA-USDA, Pullman, WA 99164, and research plant pathologist, SEA-USDA, Corvallis, OR 97331.

Received for publication January 16, 1978.




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