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Russian wheat aphid causes greater reduction in phloem transport capacity of barley leaves than bird cherry-oat aphid

Sefiu A. Saheed ; Department of Botany, Rhodes University, Grahamstown 6140, South Africa; School of Life Sciences, Södertörn University College, S-141 89 Huddinge, Sweden; Department of Botany, Faculty of Science, Obafemi Awolowo University, Ile-Ife 22005, Nigeria
Lisbeth M. V. Jonsson ; School of Life Sciences, Södertörn University College, S-141 89 Huddinge, Sweden
Christiaan E. J. Botha ; Department of Botany, Rhodes University, Grahamstown 6140, South Africa

Sažetak

The effects of feeding by the Russian wheat aphid (RWA), Diuraphis noxia Mordvilko and the Bird cherry-oat aphid (BCA), Rhopalosiphum padi L on the transport capacity of barley Hordeum vulgare L leaves were investigated and compared with a view to relating these effects to the visible symptoms shown by the respective infested plants. RWAcauses extensive chlorosis and necrosis on an infested plant whereas BCA causes no observable symptoms. Our results using the xenobiotic, phloem mobile fluorophore, 5, 6 carboxyfluorescein diacetate (5, 6-CFDA) revealed striking differences in damage to the transport of assimilates through the phloem by these two aphids. The result clearly suggests that short-term feeding by RWA causes a reduction in transport of assimilates and a more severe reduction or perhaps even permanent cessation of transport during long-term feeding. In contrast, feeding by BCA does not lead to a marked decrease in transport during short-term feeding period, however, a reduction in the transport was recorded during long-term feeding activities. These results perhaps suggest that damage to transport capacities of the barley leaves appears to be partly responsible for the observed symptoms in RWA-infested plants and the lack of them during BCAinfestations, symptoms such as reduction or cessation in transport of assimilates to growing tissues may lead to such observable symptoms.

Ključne riječi

Aphid; feeding; Hordeum vulgare; phloem transport; Diuraphis noxia; Rhopalosiphum padi

Hrčak ID:

50764

URI

https://hrcak.srce.hr/50764

Datum izdavanja:

17.4.2010.

Posjeta: 1.708 *