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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Comparison of structural damage caused by Russian wheat aphid (Diuraphis noxia) and Bird cherry-oat aphid (Rhopalosiphum padi) in a susceptible barley cultivar, Hordeum vulgare cv. Clipper
Physiologia Plantarum, Volume 129, No. 2, Year 2007
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Description
The Russian wheat aphid (RWA, (Diuraphis noxia) and the Bird cherry-oat aphid (BCA, (Rhopalosiphum padi L.) cause severe damage to grain crops, including barley. An investigation of the effects of these aphids on a susceptible cultivar revealed that BCA-infested barley plants remained healthy looking for 2 weeks after feeding commenced. In contrast, signs of stress and damage, including chlorosis and leaf necrosis were evident in RWA-infested plants. Our study suggests that damage to the vascular tissue because of sustained feeding by BCA was not as extensive as that caused by RWA. In addition, there is a marked difference in the salivary secretion pattern within xylem elements punctured by aphids tapping the xylem for water. RWA deposit electron-dense, amorphous to smooth saliva, which completely encases the inner walls of affected elements, and saliva encases pit membranes between xylem elements, and between xylem vessels and xylem parenchyma. Xylem tapped by BCA contained more granular saliva, which apparently does not occlude vessel wall apertures or the pit membranes to the same extent, as was observed with RWA. Damage to phloem tissue, including phloem parenchyma elements, sieve tube-companion cell (CC-ST) complexes as well as thick-walled ST, was extensive. Plasmodesmata between phloem parenchyma elements as well as pore plasmodesmata between the CC and ST were occluded by callose. We conclude that severe, perhaps permanent damage to conducting elements in RWA-infested leaves may be responsible for the detrimental chlorosis and necrosis symptoms. These symptoms are absent in BCA-infested plants. © Physiologia Plantarum 2006.
Authors & Co-Authors
Saheed, Sefiu Adekilekun
South Africa, Grahamstown
Rhodes University
Botha, Christiaan Edward Johannes
South Africa, Grahamstown
Rhodes University
Liu, L.
South Africa, Grahamstown
Rhodes University
Jonsson, Lisbeth M.V.
Sweden, Huddinge
School of Life Sciences, Södertörn University College
Statistics
Citations: 36
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1111/j.1399-3054.2006.00821.x
ISSN:
00319317
e-ISSN:
13993054
Research Areas
Environmental