Resistance to Wheat Streak Mosaic Virus and its Vector, Aceria tulipae

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Abstract
Wheat-Agropyron elongatum lines (C.I. 15321, C.I. 15322) were resistant to both streak mosaic virus (WSMV) and its vector, the wheat curl mite. A few mites developed on each line, but the plants did not develop virus symptoms. Wheat lines developed from crosses with C.I. 15321 and selected for resistance to WSMV after mechanical inoculation tests were as resistant to the mite as C.I. 15321. F1 plants appeared to have an intermediate reaction to mites. Mites developed readily on C.I. 15092, a wheat-A. intermedium line but it remained resistant to WSMV. ''Salmon'', a wheat-rye translocation line carrying a segment of rye chromosome IR, was highly resistant to the wheat curl mite but susceptible to WSMV. The mite resistance was inherited as a dominant characteristic.

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