Abstract
An individual flower-painting technique that utilises
N6-benzylaminopurine (BAP) to increase pod set was used
on an indeterminate cultivar of narrow-leafed lupin
(Lupinus angustifolius L. cv. Merrit) and on a breeding
line with restricted branching (84A/241) to examine the interaction
between pod set, water deficit, and seed yield. Petals and sepals of each
flower on each inflorescence were painted with a 0·002 M solution of
BAP every day from the first day the flower opened to the day it senesced. A
water deficit was induced, after flowering on the first-order apical branch,
in half of the plants. The other half were maintained at a soil water content
close to field capacity. Leaf water potential and leaf conductance declined
and remained at about –1·25 MPa and 300
mmol/m2· s, respectively, in the treatments
in which a terminal water deficit was induced.
Application of BAP to flowers had no effect on plant-water relations. The
water deficit reduced the number of pods that reached maturity (mature pods)
when no BAP was applied and increased seed yield in pods that filled seeds.
Application of BAP increased the number of pods that reached maturity.
However, the additional pods that reached maturity produced unfilled seeds.
Seed yield and harvest index were reduced in the BAP treatments, mainly as a
result of a reduction in seed number. An increase in seed abortion during seed
filling probably caused the reduction in seed number. We conclude that the
reduction in seed number and pod filling resulted from a shortage of
assimilates to fill all the mature pods produced.
Subject
General Agricultural and Biological Sciences
Cited by
19 articles.
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