Water deficits change dry matter partitioning and seed yield in narrow-leafed lupins (Lupinus angustifolius L.)
1991
French, R.J. (Western Australian Dept. of Agriculture, Merredin. Dryland Research Inst.) | Turner, N.C. (Commonwealth Scientific and Industrial Research Organisation, Wembley (Australia). Div. of Plant Industry)
Irrigation treatments were imposed in the field on an indeterminate cultivar and a line with reduced branching so that they experienced transient mild, transient severe, or sustained water deficits compared with a frequently-irrigated control treatment. Leaf conductance and, later, leaf water potential both declined in all treatments that included a deficit. Seed yield and total dry weight were reduced except where the deficit was mild and transient. However, both transient-deficit treatments increased main-stem seed yield, mainly due to a greater weight of seed per pod, and especially in the reduced-branching line. This was due to an apparent redirection of assimilate from vegetative to reproductive growth; an actual acceleration of reproductive growth that persisted after stress relief. Under sustained water deficit, a similar effect was initiated, but could not overcome the severe stress in later growth.
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