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by
N. Boughalleb |
Total Records (
5 ) for
N. Boughalleb |
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N. Boughalleb
,
M. Mhamdi
,
B. El Assadi
,
Z. El Bourgi
,
N. Tarchoun
and
M.S. Romdhani
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The tolerance of different Cucurbita spp. rootstocks to Fusarium
spp. affecting watermelon crop was evaluated under greenhouse conditions.
Grafted plants on TZ148, Ferro, GV 100 and Just rootstocks were inoculated
with two isolates of Fusarium oxysporum f. sp. niveum and
one isolate of F. solani f. sp. cucurbitae. The survey was
undertaken at three stage of plant development: vegetative growth, flowering
and fructification. Grafted plants revealed to be more resistant to tested
Fusarium isolates compared to non-grafted ones. However, it is
important to mention that the tolerance of plants depends on the development
stages of plants. At young stage of plant development, no significant
difference between all tested rootstocks was noted. At later stages (flowering
and fructification), the level of resistance depends on isolates and vary
between very to moderately resistant. For example, GV 100 and Just remained
at high level of resistance. These rootstocks could be used in watermelon
grafting to control the disease caused by two Fusarium species
affecting watermelon. |
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N. Boughalleb
,
N. Tarchoun
,
A. El Mbarki
and
M. El Mahjoub
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From 3 watermelon cultivars Sentinel, Charleston Gray and Sugar Pack tested against some Tunisian isolates of Fusarium solani f. sp. cucurbitae and Fusarium oxysporum f. sp. niveum, Sugar Pack revealed to be the most susceptible cultivar and was used for grafting to evaluate the resistance of 9 cucurbit rootstocks. Strong toza, TZ148, Emphasis, Polifemo and Ercole were resistant to highly resistant to five Fusarium isolates tested. Rootstocks of Ferro RZ, Macis and S.Camel showed a partial resistance to some isolates of Fsc and Fon. Achille revealed to be highly resistant to Fsc, but susceptible to some isolates of Fon. Seedlings grafted Strong toza x Sugar Pack, TZ 148 x Sugar Pack, Emphasis x Sugar Pack, Achille x Sugar Pack and Ercole x Sugar Pack were resistant to Fsc and Fon isolates. These rootstocks could be used in grafting of watermelon to resolve the problem of two Fusarium species affecting watermelon. |
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S. Hammami
,
N. Mighri
,
H. Ben Jannet
,
N. Boughalleb
,
A. Zardi-Bergaoui
,
A. Nefzi
,
P. Abreu
and
Z. Mighri
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Bioactivity guided fractionation of Echiochilon fruticosum Desf. (Boraginaceae)
butanolic extract biautography assay against fungi led to the isolation of a new
bioactive alkaloid, named saoussanabiloide (1). Its structure was established
on the basis of spectroscopic measurements, IR, MS and 2D NMR using COSY, HMQC
and HMBC experiments. The strongest inhibitory effect of the butanolic extract,
from fractions derived from the crude extract and saoussanabiloide (1),
were observed against Fusarium oxysporum f. sp. niveum. |
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N. Boughalleb
and
M. El Mahjoub
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In this study, we used direct incubation of watermelon dissected seeds on Komada`s selective medium for Fusarium spp. and incubation of entire seed on the same medium or on 2% agar medium. Identification of fungi was based on morphological criteria and also according to Koch`s postulate. Isolates from dissected seed were identified as F. oxysporum f. sp. niveum and F. solani f. sp. cucurbitae. These fungi were found to be externally and internally seed borne in watermelon. This is the first report of localization of Fusarium spp. transmitted by watermelon seeds in Tunisia. |
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