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Variation in the
resistance of
some
faba bean genotypes
to Orobanche crenata
Zouhaier Abbes*,
Fadhel Sellami, MOEZ AMRI and Mohamed Kharrat
Abstract:
Four faba
bean (Vicia faba L.) genotypes were tested for their reaction to
Orobanche crenata Forsk., infestation. Evaluation was carried out
for two cropping seasons at the Ariana research station, Tunisia in a
field naturally infested with O. crenata and in pot experiments.
At maturity, the genotypes Baraca, Giza429 and the breeding line Bader
carried 2-6 times less of number of emerged parasites and 3-7 less of
dry weight of emerged parasites than the susceptible cv. Badï. The
average yield observed for the three resistant genotypes was two to
four-fold higher than the one observed for the susceptible genotype.
These resistant genotypes seemed to flower earlier and to show late
orobanche establishment which gave them an advantage over the parasite.
The genotype Bader, which was selected for its resistance to O.
foetida, was resistant to O. crenata, showing that
selecting for O. foetida resistance can protect against O.
crenata infection. Besides, the two genotypes Baraca and Giza429
selected for their resistance to O. crenata in Spain and Egypt
respectively, do not present tubercle necrosis on their roots, showing
that they do not respond similarly to the Tunisian population of O.
crenata. These partially resistant genotypes may provide breeders
with additional sources of resistance to O. crenata, and can form
appropriate material for an integrated control package.
Institut National de la
Recherche Agronomique de Tunisie, Laboratoire des Grandes Cultures, Rue
Hédi Karray, 2080 Ariana, Tunisia.
E-mail :
zouhaier.abbes@fst.rnu.tn
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