Judul: Analisis Genetik Populasi Setengah Dialel Lima Genotipe Pepaya (Carica papaya L.)
Abstrak: The increase of papaya production is not followed by quality increment so that cannot meet the consumer’s requirements and taste. One strategy to enhance the development of papaya commercially is the supply of superior cultivars based on consumers taste through papaya breeding program. In order to get an appropriate breeding method, basic informations are essential such as general combining ability (GCA), specific combining ability (SCA), heritability, type of gene action, heterosis, linkage between the characters and influence of the characters associated with the yield. The objectives of this experiment were to study the general combining ability and specific combining ability among five genotypes of papaya, the diversity of fruit quality and yield of ten F1 hybrids, to path-analysis the morphological characters associated with yield potential and fruit quality of papaya. Five S3 papaya genotypes resulted by Indonesian Tropical Fruit Research Institute (ITFRI); BT2, Carmina, Dampit, Carmida and Merah Delima, were used as parents for the development of half diallel populations. Five parents and their ten hybrids were planted at Dramaga field experiment, Bogor, 250 asl altitude, using Randomized Completely Design with three replications. Combining ability was analyzed using Grifting Method II diallel analysis procedure. Variance of analysis all variable observed including vegetative and generative growth, fruit production and quality showed significant difference among genotypes tested. Analysis of variance of GCA and SCA for yield component of variable were very significant difference except SCA for lag phase. The characters of fruit weigth, fruit length, and flesh hardness were controled by additive gene action and Dampit can be selected as parent plant with the best GCA for those characters. The characters of flesh thickness, TSS, fruit number, production per plant and the percentage of abnormal fruit were controlled by non-additive gene action because the efect of SCA and non-additive variance were greater than the efect of GCA and additive variance. Hybrids CarminaXCarmida were heterosis and have the highest SCA and mean for flesh thickness and TSS. Hybrids BT-2 X Dampit, Carmina X Dampit and Carmina X Carmida. have the highest SCA and mean for production per plant. The path analysis result showed the character of leaf width can be used as a marker for highest production, but it cannot be used as selection criteria doe to low of narrow sense heritability. The characters of petiole length and fruit weight can be used as selection criteria for further generation and marker for high production.
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Judul: Pendugaan Parameter Genetik dan Kualitas Buah Pepaya Hibrida
Abstrak: This study aims to obtain a hybrid papaya varieties that have a high heterosis value to be released into new varieties. The research was conducted in May 2011 to May 2012 at Research Station PKHT IPB Tajur (250 m asl) and at post-harvest laboratory PKHT Baranang Siang, Bogor, West Java. This study used six genotypes consist of 3 hybrid genotypes IPB H93, IPB H91, IPB H39 and parent genotypes IPB 9, IPB 3 and IPB 1. Quantitative parameters were observed that plant height; first fruit position; amount of fruit, flower and leaves per plant; stem diameter; fruit diameter, fruit length and circumference of fruit; whole fruit weight, edible portion, 100 seed weight, and the whole seed weight; the skin and flesh firmness; flesh thickness; total soluble solid (obrix); juice pH; total tritated acid; vitamin C. Qualitative parameters were observed that fruit skin color, flesh color of ripe fruit, fruit shape, and the dominant central cavity. The result showed that hybrid genotype IPB H91 had a lot of character superior to the other between hybrids genotypes and had the better character than the parents.
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Judul: Katalis Zink Ferit Tersubstitusi Cu untuk Oksidasi Benzil Alkohol
Abstrak: Katalis berperan dalam menurunkan energi aktivasi. Katalis ZnFe2O4 dan ZnFe2O4 tersubstitusi Cu disintesis menggunakan metode kopresipitasi untuk digunakan dalam oksidasi benzil alkohol. Katalis dicirikan dengan spektrofotometer inframerah (FTIR) dan difraktometer sinar-X. Spektrum FTIR menunjukkan puncak serapan dari ikatan Zn-O dan Fe-O masing-masing pada rentang 559‒575 cm-1 dan 419‒447 cm-1. Difraktogram menunjukkan terbentuknya fase tunggal Zn0.6Cu0.4Fe2O4 pada katalis ZnFe2O4 tersubstitusi Cu 20%. Benzil alkohol dioksidasi dengan sistem refluks. Konversi benzil alkohol meningkat dengan meningkatnya suhu. Kadar benzaldehida yang dihasilkan dengan katalis ZnFe2O4 tersubstitusi Cu 20% lebih tinggi dibandingkan dengan katalis ZnFe2O4 yang tidak tersubstitusi dan yang tersubstitusi Cu 60 dan 80%. Hal tersebut menunjukkan bahwa katalis ZnFe2O4 tersubstitusi Cu 20% memiliki kinerja yang lebih baik dalam oksidasi benzil alkohol menjadi benzaldehida dengan kadar benzaldehida 8.763%.
Keyword: Benzil alkohol, katalis, oksidasi, ZnFe2O4