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Abstrak :
Penelitian dilakukan untuk mengetahui pengaruh pemberian strain Nostoc CPG8, CPG24, dan CIM7 terhadap pertumbuhan vegetatif dan generatif padi varietas Ciherang. Data dianalisis secara statistik dengan uji ANOVA dan LSD, kecuali data jumlah daun, dianalisis secara deskriptif. Hasil penelitian menunjukkan pemberian strain Nostoc CPG24 dan CIM7 berpengaruh nyata meningkatkan tinggi tanaman akhir (P < 0,05). Strain Nostoc CPG8 dan CPG24 berpengaruh nyata menurunkan jumlah buah kosong (P < 0,05). Pemberian ketiga strain Nostoc tidak berpengaruh nyata terhadap parameter vegetatif panjang akar dan parameter generatif jumlah bulir, jumlah buah berisi, berat basah dan berat kering tanaman tanpa buahbuahh total buah per rumpun, jumlah buah bernas per rumpun, jumlah buah kosong per rumpun, berat basah tanaman, dan berat basah, serta berat basah dan berat kering buah. ......This experiment was conducted to see the effect of Nostoc strains CPG8, CPG24, and CIM7 to vegetative and generative growth of Ciherang varieties of rice. Data was analyzed used statistics, with ANOVA and LSD, except for leaf total was used descriptive. The result showed that Nostoc strains of CPG24 and CIM7 increased plant height (P < 0,05). Nostoc strains of CPG8 and CPG24 decreased the number of filled out grains (P < 0,05). Those three Nostoc strains had not affect increase root length, the number of panicles, the number of filled grains, fresh and dry weight plants without grain, and fresh and dry weight grains.

Abstrak :
Telah dilakukan penelitian untuk mengetahui laju fiksasi nitrogen strain-strain Nostoc [Vaucher 1803] Bornet et Flahault 1886. Penelitian menggunakan 8 strain Nostoc koleksi Laboratorium Taksonomi Tumbuhan, Departemen Biologi, FMIPA UI. Penelitian menggunakan metode Acetylene Reduction Assay (ARA) dengan 2 ulangan untuk setiap strain Nostoc. Pengujian dilakukan pada strain yang telah berumur 21 hari. Biomassa berat basah strain Nostoc yang digunakan adalah 0,1 gram. Masing-masing strain diinkubasi selama 30, 60, dan 90 menit dengan menambahkan 1 ml gas asetilen. Hasil penelitian menunjukkan data yang bervariasi untuk masing-masing strain Nostoc pada masing-masing waktu inkubasi. Sebanyak 6 strain Nostoc menunjukkan nilai laju fiksasi nitrogen tertinggi pada waktu inkubasi 30 menit. Sebanyak 2 strain Nostoc menunjukkan nilai laju fiksasi nitrogen tertinggi pada waktu inkubasi 60 menit. Strain Nostoc BTM6-02 menunjukkan nilai laju fiksasi nitrogen yang paling tinggi yaitu 3892,5 μmol (dicapai pada inkubasi 60 menit). Strain Nostoc CPG24 menunjukkan nilai laju fiksasi nitrogen yang paling rendah, yaitu 292,44 μmol (dicapai pada inkubasi 90 menit). ......The research of nitrogen fixation rate of Nostoc [Vaucher 1803] Bornet et Flahault 1886 have been done. Eight strains of Nostoc from Plant Taxonomy Culture Collection, Department of Biology, Faculty of Mathematics & Natural Sciences, University of Indonesia, were used. The measurement of nitrogen fixation used Acetylene Reduction Assay (ARA) method with 2 samples for each strain. Experiments were conducted using strains at 21st day age. Wet weight of each strain was 0.1 gram. Then, each Nostoc strain was incubated with addition of 1 ml acetylene for 30, 60, and 90 minutes. The experiment result showed a different value for each Nostoc strain in every incubation times. Six Nostoc strains showed the highest value of nitrogen fixation after incubated for 30 minutes. Two Nostoc strains showed the highest value of nitrogen fixation after incubated for 60 minutes. Nitrogen fixation rate of BTM6-02 reached the highest value of 3892.5 μmol after incubated for 60 minutes. Nitrogen fixation rate of CPG24 was the lowest ones (292.44 μmol) after incubated for 90 minutes.

Abstrak :
Penelitian pengaruh pemberian variasi strain Nostoc CPG24 dan GIA13a yang diinokulasikan pada hari ke-1 dan hari ke-10 terhadap pembibitan padi (Oryza sativa L.) varietas Ciherang pada beberapa media tanam telah dilakukan sejak bulan Maret sampai Mei 2015. Berat inokulum total yang diberikan sebesar 0,2g; 0,4g; dan 0,6g pada media tanah kebun steril (TKS), tanah kebun non steril (TKNS), pupuk organik steril (POS), dan pupuk organik non steril (PONS). Pengamatan dilakukan terhadap panjang akar, tinggi tanaman, berat basah, dan berat kering tanaman padi pada umur 14 hari. Data dianalisis menggunakan uji ANAVA, kecuali data berat basah dan berat kering. Berdasarkan uji ANAVA, strain CPG24 dan GIA13a tidak berpengaruh terhadap panjang akar tetapi berpengaruh terhadap tinggi tanaman padi (P<0,05). Variasi inokulum tidak berpengaruh terhadap panjang akar dan tinggi tanaman padi (P<0,05). Media tanam berpengaruh terhadap panjang akar dan tinggi tanaman padi (P<0,05). ......The effect of Inoculation of Nostoc Strains CPG24 and GIA13a at the 1st and 10th day on the Germination of Ciherang Rice (Oryza sativa L.) in several media had been examined from March to May 2015. The given total inoculum are 0,2g; 0,4g; and 0,6g to sterilized soil (TKS), nonsterilized soil (TKNS), sterilized organic soil (POS), and nonsterilized organic soil (PONS). Observation is focused to root length, height, fresh and dry weight of 14-day-old plant. Data was analyzed by using ANAVA, with the exception of fresh and dry weight. Based on the ANAVA, CPG24 and GIA13a strain has no effect on root length but has an effect on plant height (P<0,05). Inoculum variation has no effect on root length and height of rice plant (P<0,05). The Media affects the root length and height of rice plant (P<0,05).

Abstrak :
Penelitian dilakukan untuk mengetahui interaksi yang terjadi antara strain Nostoc CPG24 dan akar tanaman padi varietas Ciherang yang ditanam menggunakan sistem hidroponik. Rumpun padi usia 14 hari (1 rumpun terdiri atas 3 tanaman padi) diko-kultivasi pada tabung reaksi berisi medium cair BG11 N-free konsentrat 10 x yang diberi aerasi. Pemeliharaan tanaman padi dilakukan dalam ruangan dengan 12 jam siklus terang-gelap selama 14 hari. Perlakuan yang diberikan terdiri atas pemberian strain Nostoc CPG24 0,4 g (P1), IAA 15 ppm (K+), strain Nostoc CPG24 0,4 g + IAA 15 ppm (P2), dan kontrol negatif (K-). Hasil penelitian menunjukkan ada interaksi antara strain Nostoc CPG24 dan akar tanaman padi berupa penempelan strain Nostoc CPG24 pada keseluruhan bagian akar, pembentukan dan pemanjangan akar lateral serta rambut akar. ......The aim of the study was to observe the interaction between Nostoc strain CPG24 and roots of Ciherang rice. A bunch of 14-day-old rice seedlings (3 seedlings were wrapped to make 1 bunch) were co-cultivated on aerated BG11 N-free liquid medium 10x concentrate in the test tube. The plants were grown in the room with a 12 hours light-dark cycle for 14 days. The treatments were applied by giving Nostoc strain CPG24 0,4 g (P1), 15 ppm IAA (K+), Nostoc strain CPG24 0,4 g + 15 ppm IAA (P2). Nor Nostoc and IAA were given in negative control (K-). The result showed an interaction between Nostoc strain CPG24 and roots of rice in form of attachment of Nostoc strain CPG24 on the surface of the roots, also on formation and elongation part of lateral and hair roots.

Abstrak :
Penelitian dilakukan untuk mengetahui adanya interaksi strain Nostoc GIA13a dengan akar tanama padi (Oryza sativa L.) varietas Ciherang melalui sistem penanaman hidroponik. Tanaman padi varietas Ciherang (T14) diko-kultivasi selama 14 hari dalam medium kontrol negatif yang berisi medium BG11 N-free konsentrat 10x, kontrol positif berisi medium yang mengandung IAA 15ppm, perlakuan 1 berisi medium dan strain GIA13a sebanyak 0,4 g, dan perlakuan 2 berisi medium yang mengandung IAA 15 ppm dan strain GIA13a sebanyak 0,4 g. Hasil penelitian menunjukkan bahwa strain GIA13a mampu melakukan interaksi dengan akar padi berupa penempelan pada zona maturasi akar dan bukan pada zona meristematis akar. Pemberian auksin (IAA) sebesar 15 ppm pada medium mampu menginduksi pemanjangan akar lateral dan rambut akar tanaman padi. ......The aim of present study was to determine the interaction of Nostoc strain GIA13a with roots of rice (Oryza sativa L.) Ciherang varieties by hydroponic system. Cocultivation of paddy (D14) grown for 14 days in negative control containing BG11 Nfree concentrate medium, positive control containing BG11 N-free concentrate plus auxin (IAA) 15 ppm medium, treatment 1 containing BG11 N-free concentrate medium and strain GIA13a as 0,4 g, and treatment 2 containing BG11 N-free concentrate plus auxin (IAA) 15 ppm medium, and strain GIA13a as 0,4 g. Results show that strain GIA13a able to interact with rice roots to form attachment at maturation zone and not on meristematic zone. Fifteen ppm of auxin (IAA) in medium induce elongation of lateral root and root hairs of rice plant.