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Differential gene expression analysis induced by the interaction between common beans (Phaseolus vulgaris L.) and arbuscular mycorrhizal fungi under drought

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Gustavo Henrique Recchia
Total Authors: 1
Document type: Doctoral Thesis
Press: Piracicaba.
Institution: Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura (CENA/STB)
Defense date:
Examining board members:
Tsai Siu Mui; Luciana Lasry Benchimol; Carlos Alberto Labate; Daniela Defavari do Nascimento; Camila Maistro Patreze
Advisor: Tsai Siu Mui

Drought is one of the main problems that affect common bean\'s production. Despite the importance of root fenological characters, breeding efforts for the culture have focused on the selection of cultivars for grain yield. The symbiosis stablished between AMF and plants enhances the potential of water absorption from the soil through an extensive net formed by hyphae and alters vital metabolic pathways involved in the maintenance of the water relations in plants. The interaction model common bean (BAT 477) colonized by a mixture of AMF (Glomus clarum, Acaulospora scrobiculata and Gigaspora rosea) was exposed to a water deficit regime of 96 h during pre-flowering. Global transcriptome from inoculated and non-inoculated roots, exposed or not to drought, were compared through RNA-Seq. A set of 71 transcripts was induced by AMF during drought. Comparing both stress and control treatments, 12,086 unigenes were regulated in inoculated plants, and 11,938 in non-inoculated, reflecting the great tolerance potencial of the lineage BAT 477 and indicating that the presence of AMF produces a fine tune regulation on the expression of genes regularly involved on the drought response of the plant. It was selected 15 transcription factors and their expression profiles were characterized through RT-qPCR taking 3 periods, 48, 72 and 96 h of water deficit. AM plants activated earlier (after 72 h) the expression of these genes, reflecting improvements on the water conditions of the plant that delay the stress perception. Additionally, the expression of 23 transcripts was evaluated on three different tissue samples obtained through laser microdissection microscopy. Glucan 1,3 ?-Glucosidase and PIP2,3, were detected only in cortical cells containing arbuscules, pointing to a possible tissue specific induction dependent of the presence of the fungus. Additional analysis point to the regulation of 171 unigenes involved on the response of the AMF to drought. These results corroborate the initial hypothesis that the inoculation with AMF alters the gene expression profiles of genes that are vital for water deficit response in plants (AU)

FAPESP's process: 11/12485-3 - Analysis of differential gene expression caused by the interaction of common bean (Phaseolus vulgaris L.) and arbuscular mycorrhizal fungi under the effect of drought stress
Grantee:Gustavo Henrique Recchia
Support Opportunities: Scholarships in Brazil - Doctorate