Effects of reduced plant height on breeding requirements and ...

plus the fowCf! values relative to respectiveelâ values for
all populations suggested. the design employed was more than
adequate in characterizing these l"ínes for <strong>height</strong>, despite
the significant afr" in all cases. This interaction arose
due to dífferences in magnitude, trot Ín rank, between years,
caused by the less than ideal growing conditions in l9Z4
giving rise to shorter <strong>plant</strong>s. The lack <strong>of</strong> any sígnificant
)
6-[¡ conbined with the readily explainable cfr, further suegested
that one year <strong>of</strong> testing at one location with two
replicates would have been suffieient to determine the
relative <strong>plant</strong> <strong>height</strong>s <strong>of</strong> these genotypes.
the heritability estímates were 1arger than ¡¡6str
reported 1n the literature. This oceurred. because, one,
pl,ant <strong>height</strong> in barley is simply inherited; and two, since
the populations ínvolved were derived from parents differing
widely for <strong>height</strong>, both the waria-nc e and absolute <strong>height</strong>
range were larger than in most other studies. Such high
heritabllity for <strong>height</strong> cou1d, then, alter the breeding
behaviour <strong>of</strong> other closely related characters"
KexneL weiEht. DespÍte sígnificant levets o¡Ofrf,
again the result <strong>of</strong> differences in magnÍtude rather than
rankihg between years, kernel weight was highly heritable.
These factors, plus the Lack <strong>of</strong> signif icant level"s <strong>of</strong> 4f
)
and o[1yr indieated that the procedure used in thís study
was adequate in determining genotypic 1eve1s <strong>of</strong> this para_
meter. ÌIowever, it appears from the relative sÍze <strong>of</strong> the
.)
O! rralues that larger samples and./or more replication would
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