The effect of ryegrass mosaic virus on carbon assimilation and growth of ryegrasses

A - Papers appearing in refereed journals

Jones, M. B., Heard, A. J., Woledge, J., Leafe, E. L. and Plumb, R. T. 1977. The effect of ryegrass mosaic virus on carbon assimilation and growth of ryegrasses. Annals of Applied Biology - AAB. 87 (3), pp. 393-405.

AuthorsJones, M. B., Heard, A. J., Woledge, J., Leafe, E. L. and Plumb, R. T.
Abstract

The growth of simulated swards of Italian and perennial ryegrass, artificially infected with ryegrass mosaic virus (RMV) or RMV‐free, was investigated. During the build up of RMV infection, dry‐matter yield was usually decreased in infected swards, and the effect was confirmed when single vegetative regrowths of swards were investigated in detail.

The primary cause of lower yields in RMV‐infected swards appears to be a decrease in net canopy photosynthesis (maximum decrease about 50%) and an associated increase in dark respiration (maximum increase about 50%). The decrease in net canopy photosynthesis is due primarily to a lowered rate of net photosynthesis of constituent leaves within the canopy.

A secondary effect of RMV infection is to decrease tillering (maximum decrease about 30%) which results in a change in canopy structure and in particular a lower leaf area index. In the present experiments, lower light utilization by the swards is less important than the decrease in leaf photo‐synthetic efficiency in lowering yield.

Year of Publication1977
JournalAnnals of Applied Biology - AAB
Journal citation87 (3), pp. 393-405
Digital Object Identifier (DOI)doi:10.1111/j.1744-7348.1977.tb01904.x
Open accessPublished as non-open access
Output statusPublished
Publication dates
Print01 Dec 1977
Publication process dates
Accepted23 Jun 1977
Copyright licensePublisher copyright
PublisherWiley
ISSN0003-4746

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