Australasian Plant Disease Notes (2013) 8, 125-129

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S.Y. Yang, N. Habili, A. Aoda, I. Dundas, J.G. Paull and J.W. Randles (2013)
Three group 16SrII phytoplasma variants detected in co-located pigeonpea, lucerne and tree medic in South Australia
Australasian Plant Disease Notes 8 (1), 125-129
Abstract: Legume-infecting phytoplasmas identified in symptomatic tree medic (Medicago arborea), lucerne (M. sativa) and pigeonpea (Cajanus cajan) growing at a single trial site at Urrbrae, South Australia, were all shown to belong to the 16SrII phytoplasma taxonomic group, but each host species was found to be infected with a different genotype. Within one species (M. sativa) the genotypes were more uniform as demonstrated by comparing five isolates from lucerne plots. These lucerne genotypes differed from the Australian lucerne yellows phytoplasma genotype previously described in New South Wales, and the pigeonpea phytoplasma isolate was more similar to the non-legume infecting Bonamia little leaf (BoLL) than to pigeonpea little leaf phytoplasma. This diversity supports the view that these legumes were infected from different reservoir phytoplasma hosts rather than from a single perennial host such as tree medic.
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Full text of article
Database assignments for author(s): John W. Randles, Ian S. Dundas, Nuredin Habili

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

16SrII phytoplasma group Alfalfa/lucerne (Medicago sativa) Australia (South+SE)
16SrII phytoplasma group Medicago - other species Australia (South+SE)
16SrII phytoplasma group Pigeonpea (Cajanus cajan) Australia (South+SE)