Anthurium adreanum Lindl. cv. Nitta is an ornamental plant for cut flower industries. In vitro propagation enables a large scale production of high quality seedlings of A. adreanum quickly. The aim of this experiment was to overcome some problems in the in vitro propagation of A. adreanum, such as contamination, lack of plantlets vigor and low rate of survival in the acclimatization. In vitro propagation of A. adreanum was conducted via organogenesis from leaf explant. Explant sterilization using desogerm, antioxidant, alcohol, rifampicin, and NaOCl was the best because they reduced browning and contamination until 0 %. Organogenesis of A. adreanum was successfully initiated using MS medium added with 2,4-D and BAP at 1 mg L -1 , which produced 74 shoots per explant. Shoots were best maturated in MS medium with a half strength of macro minerals added with 1 mg L -1 paclobutrazol. Survival rate increased by 7 and 14 days hardening treatment using double layer medium in the light culture room. Survival rate reached 89.3 % at 8 weeks after acclimatization.

Abstract. Elaeis oleifera x Elaeis guineensis (OxG) hybrid is an oil palm interspecific crossbreed to produce a variety with better oil quality, slow stem growth, and resistance to bud rot disease. However, one of the problems in OxG hybrid breeding program is an inefficiency in the conventional propagation method, while the protocol for OxG hybrid tissue culture has not been established yet in Indonesia. Somatic embryogenesis (SE) using a temporary immersion system (TIS) will be used for OxG clonal propagation as it has been established successfully in E. guineensis. Explants were young leaves derived from genotypes of selected F1 and backcross (BC) of OxG hybrids where the E. oleifera was originated in Brazil and Suriname. Callus initiation used eight media with various compositions of minerals, hormones, and active charcoal. Initial callus emerged in 8-10 weeks after culture. The average of callogenesis frequency was 3.49% in F1 and 5.59% in BC hybrid explants, with the highest at 10.73% occurred in BC Brazil. Callogenesis of OxG hybrid showed a high potency as callogenesis of E. guineensis. The callus had nodular structure which was potentially embryogenic. After 3 cultures, some of the embryogenic calli were transferred to TIS for somatic embryo induction.

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In this paper, the H. brasiliensis COBRA gene family, alleged to be involved in laticifer differentiation, was identified from the public rubber tree genome of Reyan 7-33-97 clone. A comparative analysis was carried out against A. thaliana genomic database. This analysis has resulted to the in silico validation of thirteen putative genes encoding glycophosphatidylinositol anchors (GPI) proteins harbored by nine Hevea genomic scaffolds. The sequence’s similarity of HbCOBL against AtCOBL genes were ranged from the threshold 50 to 81.58% covering 151 to 458 amino acid residues, respectively. Three partial and ten full-length protein sequences of HbCOBL genes were annotated. The partial protein sequences ranged from 89 to 184 amino acid residues as opposed to the full-length proteins ranging from 160 to 471 amino acid residues. Two types of COBRA domains (pfam04833 and cl04787) were found among HbCOBL genes. Phylogenetic analysis has clustered two subfamilies. Nine HbCOBL genes (HbCOBL-B, HbCOBL-J, HbCOBL-C, HbCOBL-H, HbCOBL-F, HbCOBL-I, HbCOBL-M, HBCOBL-A, and HbCOBL-N) were clustered as COBRA gene subfamily-I. By contrast, four genes (HbCOBL-O, HbCOBL-P, HbCOBL-E, and HbCOBL-L) were clustered as COBRA gene subfamily-II. The HbCOB subfamily-II was marked by the addition of 203 residues in C-terminal which is different with Arabidopsis. The gene HbCOBL-C was the putative ortholog to AtCOB carrying the unique COBRA domain cl04787 with 74 amino acid residues. Taken together, these results showed that Hevea and Arabidopsis COBRA genes might share similar functions while differ in gene structure.