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

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yield testlng experiments. Furthermore, ít is quite probable<br />

that, were the improvements suggesteC to reduce the levels<br />

<str<strong>on</strong>g>of</str<strong>on</strong>g>Ç ' suceessful, the 1eveLs <str<strong>on</strong>g>of</str<strong>on</strong>g> the genoilæe by envir<strong>on</strong>ment<br />

interactÍ<strong>on</strong> comp<strong>on</strong>ents míght inerease, motre str<strong>on</strong>gly in_<br />

dicating a need for testing over more envir<strong>on</strong>ments " This<br />

experiment díd not give sufficient evidence to indicate<br />

whether the number <str<strong>on</strong>g>of</str<strong>on</strong>g> years <strong>and</strong> locati<strong>on</strong>s used were suffi_<br />

cient to accurate).y meâ.sure the yieliting ability <str<strong>on</strong>g>of</str<strong>on</strong>g> these<br />

genotJrpes, <strong>and</strong> in fact, the low heritability estimates <strong>and</strong><br />

their large st<strong>and</strong>ard errors indicate that the resurts were<br />

not as good as might have been expected in view <str<strong>on</strong>g>of</str<strong>on</strong>g> the make_<br />

up <str<strong>on</strong>g>of</str<strong>on</strong>g> the naterials involved.<br />

.Tra it ComÞaris<strong>on</strong>s<br />

Plant breeders produce segregatlng populati<strong>on</strong>s in an<br />

attempt not <strong>on</strong>ly to select the superior índlviduals, but<br />

also to select those which are in some way superÍor to the<br />

best available cultivar, <str<strong>on</strong>g>of</str<strong>on</strong>g>ten used as a c<strong>on</strong>trol.<br />

In the present study lines were identÍfied as superíor<br />

to the c<strong>on</strong>trol variety B<strong>on</strong>anza for each <str<strong>on</strong>g>of</str<strong>on</strong>g> kernels per<br />

spike, kernel- weight, test weight, plurnpness, degree <str<strong>on</strong>g>of</str<strong>on</strong>g><br />

lodging, days to heading, days to rnaturity, days in post_<br />

anthesis, yie1d, levels <str<strong>on</strong>g>of</str<strong>on</strong>g> alpha-amylase, saccharifying<br />

activity, percent barley nitrogen <strong>and</strong> soluble aroino-nitrogen.<br />

WÍth <str<strong>on</strong>g>plant</str<strong>on</strong>g> treight, since selecti<strong>on</strong> would be for shortêr<br />

lines, again, all three poputati<strong>on</strong>s c<strong>on</strong>tained superi.or<br />

( shorter ) individuaLs.<br />

181

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