カイコの大卵突然変異遺伝子による形質発現 : 1.大卵形質の特徴

概要

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Detailed characterization of the "Giant egg" (Ge, 1-14.0) mutant in Bombyx mori was performed using the female progeny of the cross T (W ; 3) Ze/os+sch♀×+Ge+/os+sch♂ as materials. Females in this mating line are characterized by the female-limited larval marking of "Zebra", and the os sch larvae are normal-egg formers while the ++ are giant-egg formers with rare, less than 1%, exceptional forms which were introduced through double crossing over phenomenon. The main characteristics of Ge were as follows. 1) Size of Ge egg based on measurements of the major and minor axis was larger than that of a normal egg by 1.18 and 1.12 times, respectively. 2) Weight of Ge egg was 1.44 times heavier than that of a normal egg. 3) Number of eggs produced by a Ge female was 33 percent lower than that of a normal female. 4) Giant egg contained 1.53 times more yolk protein than a normal egg, with no qualitative differences. 5) Weight of the body and of the ovary during pupal development showed no difference between Ge and normal. It may be inferred that, in Bombyx mori, some regulatory mechanism acts in the oogenesis to keep the total amount of egg materials produced by a female at a definite level through the control of the size and number of eggs.
日本応用動物昆虫学会の論文
1987-11-25