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Plant Cell Environ. 2018 Sep;41(9):2155-2168. doi: 10.1111/pce.13172. Epub 2018 May 10.

Characterization of the genetic factors affecting quinolizidine alkaloid biosynthesis and its response to abiotic stress in narrow-leafed lupin (Lupinus angustifolius L.).

Author information

1
UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, 6001, Australia.
2
CSIRO Agriculture and Food, Floreat, WA, 6014, Australia.
3
The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, 6001, Australia.
4
Centre for Crop and Disease Management, Curtin University, Bentley, WA, 6102, Australia.

Abstract

Quinolizidine alkaloids (QAs) are toxic secondary metabolites that complicate the end use of narrow-leafed lupin (NLL; Lupinus angustifolius L.) grain, as levels sometimes exceed the industry limit for its use as a food and feed source. The genotypic and environmental influences on QA production in NLL are poorly understood. Here, the expression of QA biosynthetic genes was analysed in vegetative and reproductive tissues of bitter (high QA) and sweet (low QA) accessions. It was demonstrated that sweet accessions are characterized by lower QA biosynthetic gene expression exclusively in leaf and stem tissues than bitter NLL, consistent with the hypothesis that QAs are predominantly produced in aerial tissues and transported to seeds, rather than synthesized within the seed itself. This analysis informed our identification of additional candidate genes involved in QA biosynthesis. Drought and temperature stress are two major abiotic stresses that often occur during NLL pod set. Hence, we assessed the effect of drought, increased temperature, and their combination, on QA production in three sweet NLL cultivars. A cultivar-specific response to drought and temperature in grain QA levels was observed, including the identification of a cultivar where alkaloid levels did not change with these stress treatments.

KEYWORDS:

drought; grain improvement; grain legume; pulse; secondary metabolism; temperature

PMID:
29473655
DOI:
10.1111/pce.13172

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