Author:
Royo Conxita,Abaza Mosbah,Blanco Ricardo,García del Moral Luis F.
Abstract
The effects on grain filling and morphometry of natural drought, late sowing
and simulated drought by means of a chemical treatment with potassium iodide
(KI) were compared over 3 years of field trials in triticale ( ¥
Triticosecale Wittmack) cv. Trujillo and three
near-isogenic lines derived from it. Grain weight data fitted accurate to a
logistic curve. The maximum rate of grain filling was the curve coefficient
most sensitive to drought stress, and accounted for 7–50% of
grain yield variation. Chemical treatment with KI caused greater variation in
grain filling curve coefficients and grain morphometry than did a delay in the
sowing date, which in turn caused greater variation than natural drought. The
type and magnitude of the effects of the different kinds of stresses on grain
growth and morphometry could be related to the time that elapsed from
anthesis, at which time the effects were perceptible. KI reduced the maximum
rate of grain filling and final grain weight by 38 and 32%,
respectively, its effect being significant from 8 d after the treatment. The
volume of grain was reduced 11% by KI. The impact of delayed sowing
date and drought were significant 29 and 33 d after anthesis, respectively,
corresponding to the end of the linear phase of the grain filling curves. Both
treatments diminished grain filling duration (13% by delayed sowing,
and 6% by drought, respectively), final grain weight (16 and
12%, respectively), grain volume (15% and 8%,
respectively), and embryo area (8% in both cases), but neither altered
the maximum grain filling rate.
Subject
Plant Science,Agronomy and Crop Science
Cited by
23 articles.
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