that of dominant effect, and conditional interaction
effect had a certain influence on plant height, especially
at the early stage.
As for the plant height heterosis, some reported
that the final plant height of F1 hybrid was higher than
the high value parent according to the studies of indica/
japonica lines, indica/javanica, japonica/javanica hybrid
rice, and two-line indica hybrid rice [27-29]. Wang et al [26]
analyzed the plant height by using the developmental
genetic model, and revealed that the heterosis was the
highest at the heading stage. In most developmental
periods, the HMP(t|t-1) was positive, and achieved
significant or extremely significant levels. Meanwhile,
the HBP(t|t-1) achieved negatively significant or extremely
significant levels [26]. This study suggests that the HMP
increased gradually with the plant development,
maximizing at the later stage, whereas the HBP differed
with materials. Both HMP and HBP showed positive
values which stabilized at the later stage, and had some
new expressions at most developmental stages, but the
level and direction were quite different.
It is generally considered that plant height is
controlled by multi-genes. QTL mapping revealed that
the loci located at all 12 chromosomes, of them, a few
are major loci and most are minor ones [30]. As a
complex inherited system, it is easy to be affected by
genotypes and experimental locations. This research
adopted two groups of incomplete diallel cross materials
grown in two environmental conditions to study the
plant height at whole developmental stages, showing
that the genetic performances of plant height varied
with genotypes, environmental conditions, as well as
developmental stages.