PENGARUH MUSIM DAN PENDUGAAN PERAN GEN TERHADAP PENAMPILAN HASIL DAN KANDUNGAN PROTEIN PADA UBIJALAR (Ipomoea batatas (L.) Lam.)

Abstract

A research purposed to evaluate the effect of
planting season and gene action controlled tuber
yield and its protein content performance on
sweetpotato was carried out at Jatikerto Field
Station of Brawijaya University at about 300 m
asl. on the soil classified alfisol. Six sweetpotato
population resulted from crossing of two male
parents with three female parents were planted
in two sesons ie. rainy season (November 2004–
March 2005) and dry season (May–September
2005). The result showed that fresh tuber weight
per plant is significant influenced by season,
where the yield in dry season is higher than in
rainy season. In the other hand, planting season
did not affected dry matter (%) and protein
content of tuber. Performance of tuber yield and
its dry matter and protein content were
controlled by additive genes, so improvement of
these characters by mass selection or phenotypic
recurrent select-ion is very appropriate. Using
mass selection method with 20% selection
intensity, genetic gain of tuber yield/plant, dry
matter and protein content of tuber were 1.60 kg,
5.52% and 2.08%, respectively.