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Resistance levels of green leafhopper gene sources in rice cultivars determined by a no-choice seedling test

Published online by Cambridge University Press:  19 September 2011

B. N. Singh
Affiliation:
International Rice Research Institute (IRRI), P.O. Box 933, 1099, Manila, Philippines
R. C. Saxena
Affiliation:
International Rice Research Institute (IRRI), P.O. Box 933, 1099, Manila, Philippines
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Abstract

Seven-day-old seedlings of 22 rice cultivars with dominant Glh1, Glh2, Glh3, Glh5, Glh6 and Glh7 and recessive glh4 genes were evaluated for resistance to the green leafhopper (GLH), Nephotettix virescens (Distant), in a no-choice seedling test under uniform infestation at four nymphs per seedling. “IR29” (gene not identified) was the resistant check, while “Taichung Native 1” (no resistance gene) was the susceptible check. Maximum reproducibility for resistance score was obtained 11 days after infestation. “Pankhari 203” (Glh1), “Kalimekri 77–5” (IRRI Accessions 6613 and 6622) (Glh1), “ASD7” (Glh2), “DNJ97” and “Arai” (Glh3), “ASD8” (Glh5), “PTB18” (Glh6), and “Laki 65” (IRRI Accession 6622) and “Lasane” (Glh7) showed consistently resistant reaction under the no-choice test. The lines could be used for allelic studies of GLH resistance and for gene pyramiding.

Résumé

Des jeunes plantules de 7 jours de 22 cultivars de riz à gènes dominants Glh1, Glh2, Glh3, Glh5, Glh6 et Glh7 et ceux à gènes recessifs glh4 ont été évaluées pour leur résistance vis-à-vis de la cicadelle verte (GLH), Nephotettix virescens (Distant), dans un test sans choix sous infestation uniforme avec 4 nymphes/plant; “IR 29” (gène non identifié) était le témoin résistant; “Taichung Native 1” (aucun gène de résistance) était le témoin susceptible. Un résultat maximal reproductible pour mesurer la résistance a été obtenu 11 jours après l'infestation. “Pankhari 203” (Glh1), “Kalimekri 77–5” (Acquisitions IRRI 6613 and 6622) (Glh1), “ASD7” (Glh2), “DNJ97” et “Arai” (Glh3), “ASD8” (Glh5), “PTB18” (Glh6), et “Laki 65” (Acquisition IRRI 6622) et “Lasane” (Glh7) ont manifesté logiquement une réaction de résistance au cours du test. Ces lignées pourraient être utilisées pour des études des allèles de résistance du GLH et pour la constitution de banque de gène.

Type
Research Articles
Copyright
Copyright © ICIPE 1994

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References

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