INVESTIGADORES
MIRALLES Daniel Julio
artículos
Título:
Critical period for grain number establishment of near isogenic lines of two and six rowed barley
Autor/es:
S. ARISNABARRETA & MIRALLES D.J
Revista:
FIELD CROPS RESEARCH
Editorial:
Elsevier
Referencias:
Lugar: Holanda; Año: 2008 vol. 1 p. 196 - 202
ISSN:
0378-4290
Resumen:
In barley no studies have attempted to pinpoint the critical period for grain number determination, and it
is frequently stated that the critical period is similar to that of wheat. However, there are important
differences between the species and among barley genotypes (i.e. two- and six-rowed types) suggesting
that this assumption requires testing. The objectives of this paper were (i) to determine the critical period
for grain number determination in two- and six-rowed barleys, and (ii) to identify which yield
components were more sensitive to changes in incident radiation during that period.
Two field experiments were conducted using two pairs of near isogenic lines differing only in the spike
type. Shading was imposed at different periods throughout the crop cycle (from 60 days before heading to
15 days after) to reduce incident solar radiation approximately 70%.
The critical period for grain number determination tended to be slightly earlier in two- (ca. between
40 and 10 days before heading) than in six-rowed barleys (ca. between 30 days before heading until that
stage). In terms of the external phenology, the beginning of the critical period for setting grains was 10
days after the beginning of stem elongation, and 10 days before flag leaf appearance in two- and sixrowed
lines, respectively. Changes in the number of grains per unit area were correlated with crop growth
rate during the critical period for yield determination.