Phytopathology (1998) 88, 1372-1376

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R.E. Davis and W.A. Sinclair (1998)
Phytoplasma identity and disease etiology
Phytopathology 88 (12), 1372-1376
Abstract: Many plant diseases believed to be caused by phytoplasmas were described before phytoplasma groups were delineated through molecular analyses. It is now possible to assess the relationships between phytoplasma identity or classification and specific plant diseases. Data were consistent with the hypothesis of a common ancestral origin of pathogenicity genes in many phytoplasmas and a limited repertoire of plant responses to certain pathogen signals. Observations also were consistent with the hypotheses that the botanical host ranges of some phytoplasmas reflect specificities in transmission by vectors and vector feeding preferences; phytoplasma-insect vector relationships are keys to understanding evolutionary divergence of phytoplasma lineages; small differences in a highly conserved phytoplasma gene may be regarded as potential indicators of separate gene pools; the reliability of a diagnosis based on symptoms must be learned empirically (i.e., through case study for each syndrome); and some discrete diseases can be ascribed to phytoplasma taxa at the 16S rRNA group level, whereas others are clearly associated with phytoplasma taxa below this level.
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Database assignments for author(s): Robert E. Davis

Research topic(s) for pests/diseases/weeds:
review
identification/taxonomy


Pest and/or beneficial records:

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


16SrI phytoplasma group
16SrII phytoplasma group
16SrX phytoplasma group
16SrXII phytoplasma group
16SrVII phytoplasma group
16SrV phytoplasma group
16SrVI phytoplasma group
Phytoplasma luffae
16SrIV phytoplasma group
Phytoplasma phoenicium
Phytoplasma oryzae
16SrXIII phytoplasma group
16SrXIV phytoplasma group
16SrIII phytoplasma group