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

eported a non-significant positive correlation between
these parameters in a barley study.
Number <strong>of</strong> kernels per spike has been reported as posÍtively
associated with yield in barley (Jain and Chandra,
1968¡ Yap and Harvey, l9?2i Ruzldxa. lg?3i Manzjuk and
Barsukov, l9?4) ànd in wheat (Fonseca and patterson, 1968¡
Hsu and Walton, I9?A), Rasmusson and Cannell (I9?O) report-
ed both posÍtive correlations and non-significant assoeiations
in bartey, as did lebsock and Amaya (lS6g) and McNeal et al.
(L9?4) in wheat. It has also been noted that the nr¡mber <strong>of</strong>
kernels per spike Ís the yield component by whieh the semi-
dwarf wheats primarily have achieved theír increased y5-eld.s
(Johnson et aI., l966 (b)r Syme, L96g),
Kernel weight is the yield component which has been
reported to be negatively associated with yield <strong>of</strong> barley,
al-though thís was the case in only one report (Grafius and
Okoli, f9?4), In general, kernel weight has been positively
correlated with yield 1n wheat (Fonseca and Patterson, 19óB¡
Hsu and Walton, L97O), and in barley (DenHartog and l,ambert,
1953¡ Jain, 1p6B¡ Rasmusson and Cannell, 1!f0; Sharma, I97O;
Tap and Harvey, L972¡ Manzjuk and Barsukov, I9?4). Hsi and
T,ambert (L954) reported both positive and non-signifieant
associations in barì-ey as díd T,ebsock and Amaya (1969) in
wheat. Hayter and Ríggs (L973) reported no sígnificant
correlation <strong>of</strong> kernel weight with yield in barley" the
lesser importance <strong>of</strong> kernel weight as a yield conponent is
exempllfied by the number <strong>of</strong> tirne s a non-significant
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