EFFECTS OF COMPETITION AND SELECTION PRESSURE ON YIELD RESPONSE IN WINTER RYE (SECALE CEREALE L.)

Abstract

AN UNSELECTED RYE POPULATION, WHICH WAS BULK PROPAGATED AT THE UNIVERSITY FARMFOR MORE THAN 20 YEARS, WAS PURPOSELY CHOSEN AS THE SELECTION MATERIAL. THE INVESTIGATION WAS CARRIED OUT AT THE UNIVERSITY FARM OF THESSALONIKI IN THE GROWING SEASONS 1981-82, 1982-83 AND 1983- 84 IN SEVEN EXPERIMENTS. THREE INTENSITIES 14.3%, 5.3% AND 1.6% OF MASS HONEYCOMB SELECTION APPLIED TO AN UNSELECTEDRYE POPULATION GAVE RESPECTIVELY AN ANNUAL YIELD RESPONSE OF 0.28, -3.69 AND-5.24% AT 15 CM SPACING, AND OF 4.07, 5.39 AND 8.99% AT 90 CM SPACING. THE NEGATIVE RESPONSE WITH COMPETITION WAS EXPLAINED BY STRONG NEGATIVE CORRELATION BETWEEN COMPETING AND YIELDING ABILITY WHICH CAUSES POSITIVE SKEWNESS BECAUSEOF TRANSPOSITION OF LOW YIELDERS AND STRONG COMPETITORS FROM THE LEFT TO THE RIGHT TAIL OF THE DISTRIBUTION. THE POSITIVE RESPONSE IN THE ABSENSE OF COMPETITION WAS MAINLY DUE TO THE INCREASED GENOTYPIC DIFFERENTIATION, WHICH ALLOWED EFFECTIVE DISCRIMINATION BETWEEN HIGH AND LOW YIELDING ...
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DOI
10.12681/eadd/0085
Handle URL
http://hdl.handle.net/10442/hedi/0085
ND
0085
Alternative title
ΟΙ ΕΠΙΔΡΑΣΕΙΣ ΤΟΥ ΑΝΤΑΓΩΝΙΣΜΟΥ ΚΑΙ ΤΗΣ ΕΝΤΑΣΗΣ ΕΠΙΛΟΓΗΣ ΣΤΗΝ ΠΡΟΟΔΟ ΓΙΑ ΑΠΟΔΟΣΗΣΤΗ ΣΙΚΑΛΗ (SECALE CEREALE L.)
Author
Kyriakou, Dimitrios (Father's name: T.)
Date
1986
Degree Grantor
Aristotle University Of Thessaloniki (AUTH)
Committee members
ΦΑΣΟΥΛΑΣ ΑΠΟΣΤΟΛΟΣ
ΤΣΑΥΤΑΡΗΣ ΑΘΑΝΑΣΙΟΣ
ΦΩΤΙΑΔΗΣ ΝΙΚΟΛΑΟΣ
ΓΕΡΑΚΗΣ
ΠΑΜΙΤΣΟΣ ΚΩΝΣΤΑΝΤΙΝΟΣ
Discipline
Agricultural and Veterinary SciencesAgriculture, Forestry and Fisheries
Keywords
Competition; FAMILY INDIVIDUAL SELECTION INDEX; HONEYCOMB SELECTION; INTENSITE SELECTION; NATURAL SELECTION; POSITIVE SKEWNESS; RYE; SECALE CEREALE; SELECTION EFFICIENCY
Country
Greece
Language
Greek
Description
071 σ.
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