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- W2022598102 abstract "Abstract The recessive allele at the iucundus locus ( iuc ), which reduces the alkaloid content of the seeds of narrow-leafed lupins sufficiently to render them palatable and non-toxic to monogastric animals, also reduces seed yield by 30% on fertile soils in south-eastern Australia. The reduction was relatively constant in each of 20 trials conducted at one or both of two sites in each of 10 years. Yield was not affected by recessivity at the leucospermus flower and testa colour locus, nor by the interaction between these two loci. Comparisons between largely isogenic genotypes indicated that the quinolizidine alkaloids in wild type lupin plants enable them to produce more seeds than low alkaloid plants under many deleterious environmental conditions, including hot dry conditions during seed development, frosts during the early flowering period, drought during the pre- and post-flowering phases and Fusarium root rot attack during winter. High alkaloid plants also were found to be less affected by the brown leaf spot fungus, Pleiochaeta setosa (Kirchn.) Hughes, and were higher yielding on an acid soil containing toxic levels of available manganese and aluminium. If the alkaloids have many protective and yield-promoting functions, alternative low alkaloid alleles at the iuc or other loci would not improve yields. Supporting this hypothesis is the observation that two newly-induced low alkaloid mutations, both allelic with iuc , were low yielding. Nevertheless, yield improvement has been achieved in iuc homozygotes. It is suggested that this results, at least in part, from the accumulation of alternative genetic protective systems." @default.
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- W2022598102 date "1983-01-01" @default.
- W2022598102 modified "2023-10-07" @default.
- W2022598102 title "Selection for higher seed yield in the presence of the deleterious low alkaloid allele iucundus in lupinus angustifolius L." @default.
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- W2022598102 doi "https://doi.org/10.1016/0378-4290(83)90020-5" @default.
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