Protocol: Transient expression system for functional genomics in the tropical tree Theobroma cacao L.

Andrew S. Fister, Zi Shi, Yufan Zhang, Emily E. Helliwell, Siela Maximova, Mark Guiltinan

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Background: Theobroma cacao L., the source of cocoa, is a crop of significant economic value around the world. To facilitate the study of gene function in cacao we have developed a rapid Agrobacterium-mediated transient genetic transformation protocol. Here we present a detailed methodology for our transformation assay, as well as an assay for inoculation of cacao leaves with pathogens. Results: Agrobacterium tumefaciens cultures are induced then vacuum-infiltrated into cacao leaves. Transformation success can be gauged 48 h after infiltration by observation of green fluorescent protein and by qRT-PCR. We clarify the characteristics of cacao leaf stages and demonstrate that our strategy efficiently transforms leaves of developmental stage C. The transformation protocol has high efficacy in stage C leaves of four of eight tested genotypes. We also present the functional analysis of cacao chitinase overexpression using the transient transformation system, which resulted in decreased pathogen biomass and lesion size after infection with Phytophthora tropicalis. Conclusions: Leaves expressing transgenes of interest can be used in subsequent functional genetic assays such as pathogen bioassay, metabolic analysis, gene expression analysis etc. This transformation protocol can be carried out in 1 day, and the transgenes expressing leaf tissue can be maintained in petri dishes for 5-7 days, allowing sufficient time for performance of additional downstream gene functional analysis. Application of these methods greatly increases the rapidity with which candidate genes with roles in defense can be tested.

Original languageEnglish (US)
Article number19
JournalPlant Methods
Volume12
Issue number1
DOIs
StatePublished - Mar 11 2016

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Theobroma cacao
Cacao
Genomics
genomics
leaves
Transgenes
transgenes
pathogens
assays
Phytophthora
Genes
Genetic Transformation
Chitinases
Agrobacterium tumefaciens
Agrobacterium
lesions (plant)
Vacuum
Green Fluorescent Proteins
genes
Biological Assay

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Genetics
  • Plant Science

Cite this

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title = "Protocol: Transient expression system for functional genomics in the tropical tree Theobroma cacao L.",
abstract = "Background: Theobroma cacao L., the source of cocoa, is a crop of significant economic value around the world. To facilitate the study of gene function in cacao we have developed a rapid Agrobacterium-mediated transient genetic transformation protocol. Here we present a detailed methodology for our transformation assay, as well as an assay for inoculation of cacao leaves with pathogens. Results: Agrobacterium tumefaciens cultures are induced then vacuum-infiltrated into cacao leaves. Transformation success can be gauged 48 h after infiltration by observation of green fluorescent protein and by qRT-PCR. We clarify the characteristics of cacao leaf stages and demonstrate that our strategy efficiently transforms leaves of developmental stage C. The transformation protocol has high efficacy in stage C leaves of four of eight tested genotypes. We also present the functional analysis of cacao chitinase overexpression using the transient transformation system, which resulted in decreased pathogen biomass and lesion size after infection with Phytophthora tropicalis. Conclusions: Leaves expressing transgenes of interest can be used in subsequent functional genetic assays such as pathogen bioassay, metabolic analysis, gene expression analysis etc. This transformation protocol can be carried out in 1 day, and the transgenes expressing leaf tissue can be maintained in petri dishes for 5-7 days, allowing sufficient time for performance of additional downstream gene functional analysis. Application of these methods greatly increases the rapidity with which candidate genes with roles in defense can be tested.",
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Protocol : Transient expression system for functional genomics in the tropical tree Theobroma cacao L. / Fister, Andrew S.; Shi, Zi; Zhang, Yufan; Helliwell, Emily E.; Maximova, Siela; Guiltinan, Mark.

In: Plant Methods, Vol. 12, No. 1, 19, 11.03.2016.

Research output: Contribution to journalArticle

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AU - Fister, Andrew S.

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AU - Zhang, Yufan

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AU - Maximova, Siela

AU - Guiltinan, Mark

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