Multitrophic interactions between maize mycorrhizas, the root feeding insect Phyllophaga vetula and the entomopathogenic fungus Beauveria bassiana
Por:
Zitlalpopoca-Hernandez, Guadalupe, Bernardo Najera-Rincon, Miguel, del-Val, Ek, Alarcon, Alejandro, Jackson, Trevor, Larsen, John
Publicada:
1 jul 2017
Resumen:
Root feeding larvae of Phyllophaga vetula causes severe damage in maize
agroecosystems and their conventional management with chemical
pesticides adversely affects the environment. Plant beneficial
rhizosphere microorganisms such as mycorrhzial and entomopathogenic
fungi (EPF) offer an alternative sustainable pest management strategy,
but their successful integration in agroecosystems requires profound
knowledge about their ecology. Here we explored interactions between a
commercial isolate of the EPF Beauveria bassiana and indigenous maize
mycorrhizas and their single and combined effects against root herbivory
from the insect larvae P. vetula. Maize plants were grown in a
greenhouse for seven weeks in pots with P limited soil with all possible
combinations of the three main factors including native arbuscular
mycorrhizal fungi (AMF) (without and with), EPF (without and with) and
P. vetula (without and with).
Root herbivory by P. vetula reduced plant growth and nutrition, and in
addition reduced AMF root colonization. In contrast, AMF improved,plant
growth and P nutrition, but also reduced the population density of B.
bassiana. Inoculation with B. bassiana increased root dry weight and
counteracted a decrease in shoot N content from P. vetula root
herbivory, despite that only 5% of P. vetula larvae were infected with
B. bassiana. Dual inoculation with AMF and B. bassiana increased plant
growth and N shoot content allowing the plants to compensate for the
damage caused by P. vetula herbivory. In conclusion our results show
that combination of native AMF populations and the EPF B. bassiana
induce tolerance in maize from root herbivory by P. vetula in terms of
plant growth performance and nutrition.
Filiaciones:
Zitlalpopoca-Hernandez, Guadalupe:
Univ Nacl Autonoma Mexico, Inst Invest Ecosistemas & Sustentabilidad, Antigua Carretera Patzcuaro 8701 Exhacienda San J, Morelia 58190, Michoacan, Mexico
Bernardo Najera-Rincon, Miguel:
INIFAP, Campo Expt Uruapan, Av Latinoamer 1101, Uruapan 60150, Michoacan, Mexico
del-Val, Ek:
Univ Nacl Autonoma Mexico, Inst Invest Ecosistemas & Sustentabilidad, Antigua Carretera Patzcuaro 8701 Exhacienda San J, Morelia 58190, Michoacan, Mexico
Univ Nacl Autonoma Mexico, Escuela Nacl Estudios Super, Unidad Morelia, Antigua Carretera Patzcuaro 8701 Exhacienda San J, Morelia 58190, Michoacan, Mexico
Alarcon, Alejandro:
Colegio Postgrad, Posgrad Edafol, Carretera Mexico Texcoco Km 36-5, Montecillo 56230, Texcoco, Mexico
Jackson, Trevor:
Lincoln Res Ctr, AgRes, Private Bag 4749, Christchurch 8140, New Zealand
Larsen, John:
Univ Nacl Autonoma Mexico, Inst Invest Ecosistemas & Sustentabilidad, Antigua Carretera Patzcuaro 8701 Exhacienda San J, Morelia 58190, Michoacan, Mexico
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