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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Steroidal glycoalkaloids in Solanum chacoense
Phytochemistry, Volume 75, Year 2012
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Description
Potato (Solanum tuberosum L.), a domesticated species that is the fourth most important world agricultural commodity, requires significant management to minimize the effects of herbivore and pathogen damage on crop yield. A wild relative, Solanum chacoense Bitt., has been of interest to plant breeders because it produces an abundance of novel steroidal glycoalkaloid compounds, leptines and leptinines, which are particularly effective deterrents of herbivory by the Colorado potato beetle (Leptinotarsa decemlineata Say). Biochemical approaches were used in this study to investigate the formation and accumulation of SGAs in S. chacoense. SGA contents were determined in various organs at different stages of organ maturity during a time course of plant development. Leptines and leptinines were the main contributors to the increased levels in SGA concentration measured in the aerial versus the subterranean organs of S. chacoense accession 8380-1. Leptines were not detected in aboveground stolons until the stage where shoots had formed mature chlorophyllous leaves. To gain insights into SGA biosynthesis, the abundance of SGAs and steady-state transcripts of genes coding for enzymes of the central terpene and SGA-specific pathways in various plant organs at anthesis were compared. For two genes of primary terpene metabolism, transcript and SGA abundances were correlated, although with some discrepancies. For genes associated with SGA biosynthesis, transcripts were not detected in some tissues containing SGAs; however these transcripts were detected in the progenitor tissues, indicating the possibility that under our standard growth conditions, SGA biosynthesis is largely limited to highly proliferative tissues such as shoot, root and floral meristems. © 2011 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Mweetwa, Alice M.
United States, Blacksburg
Virginia Polytechnic Institute and State University
Zambia, Lusaka
University of Zambia
Hunter, Danielle
United States, Blacksburg
Virginia Polytechnic Institute and State University
Poe, Rebecca
United States, Blacksburg
Virginia Polytechnic Institute and State University
Harich, Kim C.
United States, Blacksburg
Virginia Polytechnic Institute and State University
Ginzberg, Idit
Israel, Bet Dagan
Agricultural Research Organization of Israel
Veilleux, Richard E.
United States, Blacksburg
Virginia Polytechnic Institute and State University
Tokuhisa, James
United States, Blacksburg
Virginia Polytechnic Institute and State University
Statistics
Citations: 35
Authors: 7
Affiliations: 3
Identifiers
Doi:
10.1016/j.phytochem.2011.12.003
ISSN:
00319422