PJB-1974-1
THE EFFECT OF RECIPROCAL DIFFERENCES ON THE GENETIC COMPONENTS OF VARIATION IN A FIVE- PARENT DIALLEL CROSS OF COMMON WHEAT
BARKAT ALI
SOOMRO
AND RUSTEM ASKEL
Abstract
THE EFFECT IF SIGNIFICANT RECIPROCAL
DIFFERENCES ON THE GENETICS COMPONENTS OF VARIATION WAS STUDIED THROUGH DIALLEL CROSS ANALYSIS OF FIVE PARALLEL F2
DIALLEL TABLE IN COMMON WHEAT (TRITICUM AESTIVUM L.). THE CHARACTER STUDIED WERE A NUMBER OF SPIKEL, PER SPIKE, 1000 KERNEL WEIGHT (IN GRAM) AND THE YIELD OF GRAINS PER PLANT (IN GRAMS). THE F2 DIALLEL TABLE WAS DIVIDED IN TO TWO SUB-SETS OF FIVE ARRAYS OF EACH , ONE BY KEEPING THE FEMALE PARENT CONSTANT AND THE OTHER BY TREATING THE MALE PARENT CONSTANT. THE RESULTS REVEAL THAT PARENTIONING THE F2 DIALLEL TABLE INTO TWO SUCH SUB-SETS AFFECT THE ARRAY VARIANCES (VR) AND THE ARRAY PARENT-OFFSPRING COVARIANCES
(WR). THIS EFFECT IS REFLECTED IN THE POSITION OF PARENTS WITH RESPECT TO ORDER OF DOMINANCE AND PROPORTION OF POSITIVE AND NEGATIVE EFFECTS OF GENES, FOR ALL THE CHARACTERS STUDIED. THE EFFECTIVE COMPONENTS OF VARIATION (D AND H2) REMAIN UNAFFECTED.
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