Judul: Effect of Crossing on Physiological Quality of Hybrid Corn (Zea mays L.) Seed
Abstrak: Seed physiological quality is an important factor in farmer acceptance of a hybrid variety. High physiological quality can be an added value to agronomic advantage of hybrid variety that consist of single cross, double cross, and three-way cross. The aim of this research was to investigate whether type of crossing affect the physiological quality of the hybrid corn seed. Four corn purelines each of high germination lines (BS07 and BS30) and low germination lines (BS32 and BS50) was planted. Completely randomized design with four replications was employed to perform 2 double cross, 8 three-way cross, and 10 single cross. Seed physiological quality was evaluated based on vigor index, germination percentage, storability, germination speed, uniformity of germination, ten normal seedlings dry weight, plumule length, primary root length, and number of seminal root. T-student and analysis of varians were used to analize the effect of maternal and crossing type on physiological quality of produced hybrid seed. The results showed that the maternal effect on physiological quality was depended on parents combination. Storability, ten normal seedlings dry weight, and primary root length were not affected by maternal effect, whereas other variables were affected on at least a pair of parents. Parent seed physiological quality significantly affected to its hybrid seed physiological quality. The effect was present on single cross and three-way cross hybrids. Low physiological quality seed parent produced low physiological quality hybrid seed. In single cross, crossing of two high physiological quality parents or crossing of high and low quality parents produced high physiological quality hybrid seeds. However, crossing of two low physiological quality parents produced low physiological hybrid seed. In three-way cross, crossing of parents that consist of at least one high physiological quality line produced a higher physiological quality hybrid seed than hybrid seed of three low physiological quality parents. In double cross, crossing of high and low physiological quality F1 parents with its reciprocal crossing produced not different physiological quality hybrid seed.
Keyword: double cross, pureline, single cross, three-way cross, vigor

Judul: Genetic distance analysis based on ssrs and morphological marker and combining ability analysis for sweet corn development (Zea mays L. Var. Saccharata) hybrid.
Abstrak: The objective of the research were to grouping sweet corn lines resistant to downy mildew, high specific and general combining ability and high heterosis to select parental line to breed single cross hybrid of sweet corn. The first research was done to study genetic variability of 39 sweet corn lines based on SSR and morphological marker to select good parental lines of hybrid sweet corn. There were high genetic variability among genetic material, showed by genetic distance value about 0.18 to 0.78, indicates wide genetic variability of sweet corn. The results shows that among 20 lines having genetic similarity between 0.25 – 0.82 or genetic distance from 0.18 to 0.75; based on morphological trait 0.27 – 1.00. Correlation value between similarity matrix based on SSR and morphology was high on 0.88 of goodness of fit criteria. The aim of second research was to study general combining ability of sweet corn lines for yield and resistant to downy mildew for hybrid varieties improvement. Six of 45 lines having high fresh ear yield per plot and best general combining ability, such as Mr4/SC/BC4-2-1B, Mr4/SC/BC4-6-1B, Mr11/SC/BC4-2-1B, Mr11/SC/BC4-4-1B, Mr12/SC/BC4-6-1B, and Mr12/SC/BC3-3-1B. All of testing lines have resistance to downy mildew with severity about 0.0 to 7.1%. The lines having high GCA value would be good combiner to other lines to develop high yielding hybrid sweet corn and resistant to downy mildew. The third research was done to study general and specific combining ability of sweet corn lines and higher heterosis of downy mildew resistance supporting the hybrid corn development. The combination of A x D lines (Mr12/SC/BC4-6-1B x Mr11/SC/BC4-2-1B) were medium genetic distance and having highest GCA, heterosis and heterobeltiosis for fresh ear yield per plot character. The D x C combination (Mr11/SC/BC4-2-1B x Mr4/SC/BC4-2-1B) have wide genetic distance and high fresh ear yield per plot, heterosis and heterobeltiosis, but have negative SCA value. The combination of E x C (Mr12/SC/BC3-3-1B x Mr4/SC/BC4-2-1B) have a wide genetic distance but low productivity. The best hybrid is not always obtained from parents with the high genetic distance, but also can be obtained from the low or medium genetic distance as well.
Keyword: Hybrid sweet corn, Zea mays L. var. saccharata, Genetic variability

Judul: Perencanan Lanskap Sunda Kalapa, Jakarta Utara Sebagai Kawasan W isata Sejarah
Abstrak: Perkembangan kota Jakarta dari waktu ke waktu sangatlah cepat, sehingga menyebabkan kota-kota tua banyak yang tergusur untuk dijadikan daerah baru yang lebih modern. Apabila hal tersebut tidak ditanggulangi secara dini maka keberadaan Kota Lama Jakarta akan hilang. Hal inilah yang melatar belakang untuk dilakukan tindakan perlindungan dan revitalisasi kawasan bersejarah Sunda Kalapa.
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