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AbstractRice species Oryza glaberrima and O. sativa and interspecific hybridsproduced at the West African Rice Development Association in Cote d'Ivoire,were screened for resistance to Heterodera sacchari, Meloidogyne graminicolaand M. incognita R2. H. sacchari screening was done in field and potexperiments in Cote d'Ivoire. Non-indigenous species were screened inglasshouse tests in the UK. All O. glaberrima genotypes were resistant to H.sacchari from Cote d'Ivoire and Ghana, M. graminicola from the Philippinesand M. incognita R2. In pot tests, the number of females which developed onthese genotypes was zero for H. sacchari and < 3 for both species ofMeloidogyne. Within lines of O. sativa, variation in female numbers (P 0.05)was observed, but all were susceptible both to H. sacchari and to M.graminicola. However, six cultivars and lines of O. sativa were lesssusceptible (P 0.05) to M. incognita R2 than the check cultivar IDSA 6. Of14 progeny from O. sativa cv. WAB56-104 x O.glaberrima line CG14, twoWAB450-I-B-P-105 and WAB450-I-B-P-160, were resistant to H.sacchari fromCote d'Ivoire. These lines and two others were also less susceptible (P0.01) to M. graminicola than the O. sativa parent. The susceptibility ofsome of the progeny to both H. sacchari and M. graminicola and M. incognitawas the same as that of the O. sativa parent. Of ten further progeny,screened against H. sacchari from Ghana, WAB450-25-1-10 was resistant. Theexpression of resistance in the interspecific progeny suggests thatresistance to H. sacchari is qualitative, whilst that to Meloidogynegraminicola is quantitative. Resistance to M. incognita R2 was found in O.glaberrima, O. sativa and in one hybrid progeny. None of the species orprogeny was resistant to Pratylenchus zeae and there were no significantdifferences in field population densities of P. zeae, Mesocriconema onoensisor Helicotylenchus dihystera. Resistance aux nematodes Heterodera sacchari,Meloidogyne graminicola et M. incognita chez Oryza glaberrima et chez deshybrides interspecifiques O. glaberrima x O. sativa - Les especes de rizOryza glaberrima et O. sativa ainsi que des hybrides interspecifiquesproduits en Cote d'Ivoire par l'Association pour le Developpement de laRiziculture en Afrique de l'Ouest ont ete testes pour leur resistance enversles nematodes Heterodera sacchari, Meloidogyne graminicola et M. incognitaR2. Les tests relatifs a H. sacchari ont ete realises, tant en champ qu'enpots, en Cote d'Ivoire. Ceux concernant les especes non indigenes l'ont eteen serre, en Grande Bretagne. Tous les genotypes de O. glaberrima sontresistants aux H. sacchari provenant de Cote d'Ivoire et du Ghana ainsi qu'aM. graminicola provenant des Philippines et a M. incognita R2. Lors destests en pot le nombre de femelles produites sur ces genotypes sont de zeropour H. sacchari et de moins de 3 pour les deux especes de Meloidogyne.Concernant les lignees de O. sativa, une variabilite (P 0,05) a ete observeedans le nombre de femelles produites, mais toutes ces lignees sont sensiblesa H. sacchari et M. graminicola. Cependant six cultivars ou lignees de O.sativa sont moins sensibles (P 0,05) a M. incognita R2 que le cultivartemoin IDSA 6. Parmi 14 descendances du croisement O. sativa cv. WAB56-104 xO. glaberrima lignee CG14, deux WAB450-I-B-P-105 et WAB450-I-B-P-160, sontresistances a H. sacchari provenant de Cote d'Ivoire. Ces lignees, ainsi quedeux autres, sont moins sensibles (P 0.01) a M. graminicola que les O.sativa parents. La sensibilite de quelques unes de ces descendances a H.sacchari et aux deux especes de Meloidogyne etait identique a celle desparents. Parmi dix autres descendances ulterieures testees envers H.sacchari du Ghana, WAB450-25-1-10 s'est montre resistant. L'expression de laresistance dans la descendance interspecifique suggere que cette resistanceest qualitative pour H. sacchari et quantitative pour M. graminicola. Uneresistance a M. incognita a ete decelee chez O. sativa et O. glaberrimaainsi que dans la descendance d'un de leurs hybrides. Aucune des especes oudes descendances n'a montre de resistance envers Pratylenchus zeae et iln'existe aucune difference significative dans les densites de populations auchamp de P. zeae, Mesocriconema onoensis ou Helicotylenchus dihystera.
Nematology – Brill
Published: Jan 1, 1999
Keywords: INHERITANCE; WEST AFRICA; ROOT-KNOT NEMATODE; LESION NEMATODE; SCREENING; CYST NEMATODE; SOUTH AND SOUTH EAST ASIA
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