Selection for economic characters in Lupinus angustifolius and L. digitatus. 2. Time of flowering

Abstract

Early-flowering plants were selected from a field population of Lupinus angustifolius and from field and X-ray-treated populations of L. digitatus. One naturally-occurring dominant gene for earliness was isolated in each species, together with an artificially-induced recessive, unlinked to the dominant, in L. digitatus. To evaluate the different genotypes for breeding purposes, and to analyse the factors of the Western Australian environment controlling their flowering time, sowings of all genotypes were made with and without artificial vernalization, over a range of sowing dates, and in a range of environments differing mainly in temperature. Effects on flower initiation were estimated from times of flowering and first flowering node numbers. Flowering of L. angustifolius was found to be controlled mainly by its vernalization requirement. In L. digitatus, vernalization, a dark period inhibition, and an acceleration of flower initiation by high temperatures all appeared to be important. The dominant genes of both species removed all effective vernalization requirement, while the recessive in L. digitatus may have removed or relaxed a dark period inhibition. It was concluded that all three earliness genes would be useful in extending the cultivation ranges of the two species.

Effects of temperature and photoperiod on flowering and yield components of lupin genotypes in the field

“…Insofar as comparisons are possible, the responses of flowering time to temperature and photoperiod agreed with the earlier findings of Gladstones and Hill (1969) and Rahman and Gladstones (1972). Possible effects of ambient temperature on initiation other than via vernalization, as suggested by Gladstones and Hill (1969) The effect of enhanced photoperiod was particularly strong in L. luteus, especially in the first sowing.…”

“…Possible effects of ambient temperature on initiation other than via vernalization, as suggested by Gladstones and Hill (1969) The effect of enhanced photoperiod was particularly strong in L. luteus, especially in the first sowing. This confirms the delay to initiation of L. luteus caused by mid-winter photoperiods, and also that enhanced photoperiod can largely substitute for the modest vernalization requirement of the species, as shown under controlled conditions by Rahman and Gladstones (1972).…”

Genetics and genetic modifications of plant architecture in grain legumes: a review

“…In Lupinus angustifolius, both quantitative and qualitative variations were found [100]. The qualitative variations were associated with the induced mutant recessive gene efl in which vernalization hastened flowering but did not appear to be essential, or the spontaneous dominant mutation Ku which suppressed the vernalization requirement [58]. Such a hastening of the flowering after seed vernalization with low temperatures was also observed in faba bean [46].…”

Development of two sequence-specific PCR markers linked to the le gene that reduces pod shattering in narrow-leafed Lupin (Lupinus angustifolius L.)

“…Domestication of this species in W.A. began in 1960 with the discovery of two natural mutant (recessive) genes, lentus and tardus for reduced pod-shattering (Gladstone, 1967) and, in 1961 a gene for nil-vernalisation requirement and early flowering (Gladstones, 1969).…”