Ultrastructural characterization of Phakopsora jatrophicola pathogen of Jatropha curcas in Yucatan, Mexico
DOI:
https://doi.org/10.33885/sf.2016.3.1151Keywords:
scanning electron microscopy, urediniospores, rust, physic nutAbstract
Physic nut (Jatropha curcas) has been considered worldwide as a source of seed oil for the production of biofuel. In Yucatan, Mexico,
this crop has been affected by rust caused by Phakopsora jatrophicola (syn. P. arthuriana), an obligate biotrophic fungus, which has
become a major constraint in obtaining expected yields. Currently, little is known about the biology of P. jatrophicola. Since there are no
previous studies at ultramicroscopic morphology level, we conducted the first Scanning electron microscopy (SEM) examination of this
species and a bioassay on J. curcas detached leaves in order to test the spore infectivity. SEM analysis revealed erumpent uredinia with
25 to 35 μm diameter open pore, containing 23 μm length x 11 μm wide equinulated urediniospores. Moreover, spores harvested from
Physic nut leaves were able to produce new pustules after 13 days of inoculation on healthy detached J. curcas leaves. These results provide
the basis for further researches of this host-pathogen interaction, and may be useful in the development of new molecular methods
for diagnostic of this specie.
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