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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
Author(s) -
Saheed Sefiu Adekilekun,
Botha Christiaan Edward Johannes,
Liu Lin,
Jonsson Lisbeth
Publication year - 2007
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.2006.00821.x
Subject(s) - xylem , russian wheat aphid , phloem , biology , rhopalosiphum padi , chlorosis , hordeum vulgare , aphid , parenchyma , botany , horticulture , agronomy , poaceae , pest analysis , aphididae , homoptera
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.