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

ate index (ÊRI ) ,
The resul_ts tabulated in Íable Zj indicated that
coleoptile length was strongly and positively associated
with both kernel weight and percent plunpness, and that
<strong>plant</strong> <strong>height</strong> was positively associated with plumpness. A
positive significant relationship also exÍsted between root
score and yield for these genotypes and between the two
kernel size parameters, kernel weight and plumpness.
Although no significant rank correlation was i',dicated.
between coleoptile length and <strong>plant</strong> <strong>height</strong>, a posi.tive
relationship did occur between these traits i"n terms <strong>of</strong> the
<strong>plant</strong> <strong>height</strong> classes, as evidenced by the ranking data <strong>of</strong>
fable f4. Thê rank correlation was non-signif j_cant due to
within <strong>height</strong>-class variation. Ihe talls did have longer
coleoptiles. Note also the demarcation <strong>of</strong> the he Íght groups
as regards kernel weight and plumpness, the tal1s having
heavier, plurnper kernels. (fable ?ll).
ANoVA for root dry weight (fable lJ) and, root growth
rate (Table ??) indicated that líttle or no difference
existed between the genotypes studied for these traits.
îhe error involved in these experirnents was very high as
evídenced by the coefficients <strong>of</strong> variability (fables 25 and
?7), Even where a difference was shown to exist at week
nine for root weight (lable fJ), t:ne range test employed in
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