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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 1021-9730
Vol. 4, No. 3, 1996, pp. 351-357
Bioline Code: cs96075
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 4, No. 3, 1996, pp. 351-357

 en Interaction between soybean mosaic potyvirus and Meloidogyne incognita infection
Iheukwumere, C.C.; Atiri, G.I.; Fawole, B. & Dashiell, K.E.


Infection of soybean (Glycine max (L.) Merrill) by
soybean mosaic potyvirus (SMV) and root-knot nematode, Meloidogyne
incognita (Kofoid and White) Chitwood, occurs wherever soybean
is grown in Nigeria.  The effect of concomitant infections of
four soybean cultivars by SMV (isolate 10) and root-knot
nematode (race 2) was investigated in greenhouse, experimental field
and on-farm studies.  Soybean mosaic potyvirus  was introduced
into soybean test plants by mechanical inoculation of homogenised
crude extract from infected leaves suspension into a shallow
trench around the base of test plants.  In all four soybean
cultivars, simultaneous or successive inoculation with both
the nematode and the virus resulted in more severe symptoms and,
therefore, reduced  yield and yield components when compared
with inoculations with each pathogen alone, although the difference
was not much with plants inoculated with virus only.  The results
were more variable under experimental field and on-farm
conditions than under more uniform greenhouse conditions. 
However, there was a significant interaction (P=0.05) between
inoculation treatments and cultivars.  Since multi-pathogen
infections depressed yields more than single infections, more
emphasis should be placed on evaluating or breeding for combined
resistance to both pathogens in soybeans.

Glycine max, multi-pathogen infections, root-knot nematode, virus

Iheukwumere, C.C.; Atiri, G.I.; Fawole, B. & Dashiell, K.E.


L'infection du soja (Glycine max (l.) Merril) par le virus
de la mosaque du soja (soybean mosaic potyvirus (SMV) et du
nematode des racines, Meloidogyne incognita (Kofoid et white)
Chitwood, a cours partout ou le soja est cultive au Nigeria. L'effet
des infections  de quatre cultivars du soja par SMV (isolate 10)
et de nematodes des racines (race 2) etait introduit dans les
plantes de soja par inoculation mecanique draits bruts homognes
de feulles infestees, alors que lculation du nematode des racines
etait realisee en versant une suspension dfs du nematode dans une
tranchee peu profonde autour de la base des plant test. Pour les
quatre cultivars de soja, lculation simultanee ou successive avec 
la fois le nematode et le virus a donne lieu  des synptomes plus
sevres et a par consequent entraine une baissse de rendement  
separement comparee aux inoculations  des agents pathognes, bien
que la difference nit pas  sensible avec les plantes inoculees
avec les seuls virus.  Ces resultats entre cultivars etaient plus
variables en champs experimentaux et en milieu  reel que dans le
serre ou les conditions sont plus uniformes.  Cependant, il y
avait une interaction (P=0.05) sensible entres les traitement
dculation et de cultivars.  Des lors que l'infection avec une
multitude d'agents pathognes a occasione une baisse de rendement
superieure a celle avec un seul pathogne, lent devrait etre mis
sur l'evaluation ou la selection en vue d'une resistance combinee deux
agents pathogenes du soja.

Mots Clés
Glycine max, infections multi-pathognes, nematode, virus

© Copyright 1996 - African Crop Science Society

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