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Sucrose
effect on broomrape (Orobanche crenata) development
on narbon bean (Vicia narbonensis L.)
S. Nadal1*,
C. I. González-Verdejo1, J. R. Guzmán2,
M. J. Suso3 and B.
Román1
1Centro
"Alameda del Obispo", IFAPA (Junta de Andalucía), Área de
Mejora y Biotecnología, Apdo. 3092, 14080 Córdoba, Spain.
2Dpto.
de Ingeniería Agroforestal. ETSIAM, Universidad de Córdoba,
Córdoba, Spain.
3IAS-CSIC,
Apdo. 4240, 14080, Córdoba, Spain.
*Corresponding author.
E-mail:
salvador.nadal.ext@junta-deandalucia.es.
Accepted 1 March, 2007 |
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The growth and development of broomrapes (Orobanche
spp.) fully depends on the nutritional connection
established between the parasitic plant and the root of the
corresponding host plant. In the present study, narbon bean
plants infected with Orobanche crenata were watered
with different concentrations of sucrose (0.014, 0.044,
0.088 and 0.146 M) in order to evaluate its effect on the
early growth stages of the parasite. The germination of
O. crenata seeds decreased with increasing sucrose
concentrations and the number of infection attachments of
crenata broomrapes decreased significantly when sucrose was
present. A parallel experiment was conducted with identical
sorbitol concentrations in order to determinate the role of
the osmotic potential in the inhibition of the parasite
growth. Our results showed that
while
low sucrose concentrations significantly reduced seed
germination in O. crenata, similar concentrations of
sorbitol have no significant effect thus indicating that the
effect of sucrose is not simply osmotic. Sucrose
phytotoxicity was also studied by considering the dry weight
of the host plants.
Key
words:
Sucrose, Orobanche crenata, Vicia narbonensis and
broomrape control. |
