Book contents
- Frontmatter
- Contents
- List of contributors
- Editors' preface
- Conference participants
- 1 Introduction and guide
- Part I The impact of viral diseases
- Part II Origins of viruses and their genes
- Part III Sources of virus variation
- Part IV Molecular interactions of viruses and their hosts
- Part V Viruses, hosts and populations
- Part VI Case studies of viral taxa; their systematics and evolution
- 18 Evolution of poxviruses and African swine fever virus
- 19 Molecular systematics of the flaviviruses and their relatives
- 20 Herpesviridae
- 21 Aphthovirus evolution
- 22 Evolution of the Bunyaviridae
- 23 Evolution of the tobamoviruses
- 24 The luteovirus supergroup: rampant recombination and persistent partnerships
- 25 The evolution of the Reoviridae
- 26 Genetic variation and evolution of satellite viruses and satellite RNAs
- 27 Molecular evolution of the retroid family
- 28 Adaptation of members of the Orthomyxoviridae family to transmission by ticks Patricia
- 29 The Order Mononegavirales: evolutionary relationships and mechanisms of variation
- 30 The molecular evolution of the human immunodeficiency viruses
- 31 Molecular evolution of papillomaviruses
- 32 Molecular systematics of the Potyviridae, the largest plant virus family
- 33 Evolution of alphaviruses
- 34 Evolution of influenza viruses: rapid evolution and stasis
- Part VII Techniques for viral systematics
- Index
32 - Molecular systematics of the Potyviridae, the largest plant virus family
Published online by Cambridge University Press: 04 May 2010
- Frontmatter
- Contents
- List of contributors
- Editors' preface
- Conference participants
- 1 Introduction and guide
- Part I The impact of viral diseases
- Part II Origins of viruses and their genes
- Part III Sources of virus variation
- Part IV Molecular interactions of viruses and their hosts
- Part V Viruses, hosts and populations
- Part VI Case studies of viral taxa; their systematics and evolution
- 18 Evolution of poxviruses and African swine fever virus
- 19 Molecular systematics of the flaviviruses and their relatives
- 20 Herpesviridae
- 21 Aphthovirus evolution
- 22 Evolution of the Bunyaviridae
- 23 Evolution of the tobamoviruses
- 24 The luteovirus supergroup: rampant recombination and persistent partnerships
- 25 The evolution of the Reoviridae
- 26 Genetic variation and evolution of satellite viruses and satellite RNAs
- 27 Molecular evolution of the retroid family
- 28 Adaptation of members of the Orthomyxoviridae family to transmission by ticks Patricia
- 29 The Order Mononegavirales: evolutionary relationships and mechanisms of variation
- 30 The molecular evolution of the human immunodeficiency viruses
- 31 Molecular evolution of papillomaviruses
- 32 Molecular systematics of the Potyviridae, the largest plant virus family
- 33 Evolution of alphaviruses
- 34 Evolution of influenza viruses: rapid evolution and stasis
- Part VII Techniques for viral systematics
- Index
Summary
Introduction
Brandes and Wetter (1959) first showed that potato virus Y together with 13 other viruses had filamentous flexuous virions about 750 nm in length, some of which were serologically related to one another. They proposed that these viruses formed a natural group, and this was subsequently named the potyvirus group by Harrison et al. (1971).
Large numbers of viruses have been added to the group, and it now contains at least 200 distinct species, or more than a fifth of all known plant viruses. It is the largest and most rapidly growing of the 50 or so families (or groups) of viruses that infect plants and is now named the Potyviridae comprising, at present, three genera, the potyviruses, rymoviruses and bymoviruses (Ward & Shukla, 1991; Barnett, 1992).
Poty viruses are found in all climatic zones, especially the tropics (Hollings & Brunt, 1981). They cause diseases in almost all crop plants and in many uncultivated species; in 1974 they were reported to infect 1112 plant species of 369 genera in 53 families (Edwardson, 1974), and that list too has grown. Their economic impact was also highlighted in a recent survey of important viruses with filamentous virions as 73% of those named were potyviruses (Milne, 1988). Thus it is important to try to understand how the potyviruses have evolved because it might give clues as to why they are such successful viruses.
Most potyviruses belong to the genus Potyvirus, and are transmitted in nature by aphids and through seeds of infected plants. These two properties, together with the diversity of crops they infect, assure the continuous presence of potyviruses in nature throughout the year (Hollings & Brunt, 1981).
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- Molecular Basis of Virus Evolution , pp. 477 - 500Publisher: Cambridge University PressPrint publication year: 1995
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