- Title
- A moderate elevation in [CO 2] results in potential hypervirulence on SABBIErica
- Creator
- Gallagher, Sean
- Creator
- Hill, Jaclyn M
- Creator
- Murugan, N
- Creator
- Botha, Christiaan E J
- Date Issued
- 2017
- Date
- 2017
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/68835
- Identifier
- vital:29329
- Identifier
- https://doi.org/10.1016/j.sajb.2017.10.010
- Description
- The Russian Wheat Aphid (Diuraphis noxia Kurdjumov, 1913) (RWA) is a serious pest of grain crops and is of considerable concern in South Africa, particularly in terms of barley grown specifically for the brewing industry. This paper highlights the effect of a small (50 ppm) increase in [CO2] on the growth rate of the four South African RWA biotypes on the SABBIErica barley cultivar. Controlled environment experiments revealed that the colony growth rate for RWASA4 was significantly lower than SA1 under ambient conditions as well as significantly lower than SA1, SA2 or SA3 under elevated CO2 conditions. The unexpected difference suggested an atypical, non-preferential feeding habit on SABBIErica, for RWASA4. The small RWASA4 colonies inflicted similar morphological damage to the significantly larger RWASA1 – RWASA3 biotype populations — indicative of potential hypervirulence under elevated CO2. The continuous feeding of RWASA biotypes causes damage to the transport system as well as substantial, catastrophic damage to mesophyll chloroplasts as well as mitochondria within the host plant's leaves. The TEM study revealed evidence of sequential/systematic degeneration of chloroplasts and mitochondria with continued aphid feeding, which we suggest is an indication of potential emergent hypervirulence under elevated CO2 conditions.
- Format
- 17 pages
- Format
- Language
- English
- Relation
- South African Journal of Botany
- Relation
- Gallagher, S., Hill, J.M., Murugan, N. and Botha, C.E.J., 2018. A moderate elevation in [CO 2] results in potential hypervirulence on SABBIErica. South African Journal of Botany, 114, pp.44-60.
- Relation
- South African Journal of Botany volume 114 44 60 January 2018 0254-6299
- Rights
- Elsevier
- Rights
- Use of this resource is governed by the terms and conditions of the National Library of South Africa Copyright Act
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Botha, Christiaan Edward Johannes (Prof)
Hill, Jaclyn Marie (Ms)
RU Department of Botany
SDG 15. Life On Land
RU Department of Zoology and Entomology
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