Grain yield of rice is determined by genotype (G), environment (E), and interaction between genotype x environment (G x E). Variety can achieve its maximum yield potential if it is grown in suitable environments. This study was aimed to determine the adaptability and the yield stability of rice genotypes grown in different environments. Sixteen rice genotypes were tested using RBD in 16 sites during the wet season of 2010/2011, and dry season of 2011. The tested rice lines were developed for resistance to pest and diseases. The experiment unit was 4 m x 5 m of plot, plants were fertilized with urea, SP36, and KCl at rates of 250 kg/ha, 100 kg/ha, and 100 kg/ha, respectively. Variable observed was grain yield per plot. Combined analyses of variance showed that there was no lines yielded higher than did check variety Conde. The AMMI analysis showed that the largest variation was contributed by the environment factors (76.49%), genotype x environment interactions (17.55%), and the smallest was contributed by the genotypes (5.97%). Data exploration using boxplot method indicated that the low contribution of the genotype x environment interaction variance in this study was due to the high degree of similarity of yield potentials among the genotypes, and due to high similarity of environmental conditions of the sites.Based on the analysis of AMMI 2, lines B12743 - MR-18-2-3-8, IPB107-F-82-2-1, and Conde was each classified as widely adapted genotypes, while G8, IPB107-F-27-6-1, and BIO111-2-BC-PIR-3714, each was considered as genotype having a specific adaptation.

This research was aimed to describe the yield stability and growth adaptation of elite lines of aromatic rice in rice production centers of North Sumatra. The experiments were conducted at 10 sites during dry season (DS) 2001 and DS 2002. Research materials consisted of 12 elite lines introduced from IRRI with IR64 as check variety. The treatments were arranged in a randomized block design (RBD) with three replications. Stability analysis was performed using methods of Eberhart and Russell, Finlay and Wilkinson, and Francis and Kanennberg. The results showed that the interaction of genotype x environment effect was very significant, indicating the presence of specific line adaptation on a particular environment. Genotypes which had the highest average yield were not always stable genotypes, as was shown by IR71137-49-1-2 which was more suitable to the sub-optimum environment. Lines IR71143-223-3-2-2-3, IR71146-97-1-2-1-3, IR65610-24-3-6-3-2-3, IR66696-49-1-2, IR71146-407-2-1-2-1, IR71146-122-1-1-2-1 were considered as stable genotypes according to the three analysis methods and each line showed high average yield. Those genotypes are suggested to be planted in the high productivity environments in order to obtain its optimum genetic expressivity on grain yield

ABSTRACT<br /><br />The breeding of rainfed rice tolerant to drought can be accomplished using anther culture. The objectives of this research were to determine regeneration abilities of six F1 anther culture and its acclimatization ability. The experiment was arranged in completely randomized design with 14 replications. The treatments consisted of six F1 derived from crossing:  INPARI 18 x IR83140-B-11-B (G1), INPARI 18 x B12825E-TB-1-25 (G2), INPARI 18 x IR87705-14-11-B-SKI-12 (G3), INPARI 22 x IR83140-B-11-B (G4), Bio-R81 x O18b-1 (G5), Bio-R82-2 x O18b-1 (G6). Media for callus induction was based on N6 medium + 2.0 mg L-1 NAA + 0.5 mg L-1 kinetin + 1.0 mM putresin + 60 g L-1 sucrosa, media for regeneration was based on MS + 0.5 mg L-1 NAA + 2.0 mg L-1 kinetin + 1.0 mM  putresin, and media for rooting was based on  MS + 0.5 mg L-1 IBA + 30 g L-1 sucrosa. The result indicated that all six F1 had different ability in anther culture. Bio-R82-2 x O18-b1 (G6) and  Bio-R81 x O18-b1 (G5) F1 genotype had good response both of callus induction and plant regeneration. These two F1 genotypes also gave the highest ratio of green planlet production to number of anther inoculated (GP:AI) were 5.50% and 4.65%,  respectively. In this research, there were identified doubled haploid plants were developed from 4 F1 derived cross namely G2 (2 plants), G3 (4 plants),  G5 (21 plants), and G6 (26 plants).<br /><br />Keywords: Callus induction, doubled haploid, rice<br /><br />

The prevalence of Zn deficiency in Indonesia is considerably high. Development of variety having high nutrient or called as biofortification supposed to be effective and efficient to combat malnutrition such as Zn deficiency. Zn fertilizer application was reported to be effective to increase rice Zn content. ICRR in collaboration with IRRI and Harvest Plus had initiated testing rice genotypes having high Zn content. The aim of this research was to initially study of Zn fertilizer, especially ZnSO4, effect to Zn content in the rice grains and to select genotypes having high the Zn content. The trial was conducted during Wet Season 2016 in Subang, West Java following split plot design of three replications with main plot of two level ZnSO4 fertilizer applications and sub plot of 24 rice genotypes. Transplanting was conducted at 21 days after sowing into 2 m x 3 m plot with planting space of 20 cm x 20 cm. The results showed that there is interaction between genotype and Zn fertilizer on yield but not on Zn content in rice grains. Zn fertilization tends to increase grain Zn content and yield. IR97477-115-1-CRB-0-SKI-1-SKI- 0-2 (5.45 t/ha, 33.65 ppm), IR97477-81-2-CRB-0-SKI-0-SKI-0-2 (5.30 t/ha, 33.40 ppm), and IR97477-115-1-CRB-0-SKI-3-SKI-0-2 (5.56 t/ha, 32.48 ppm) has either high yield or Zn content and prospective for further testing. Correlation analysis showed that Zn is strongly correlated with Fe content. Yield is positively correlated with tiller number and Fe content and negatively correlated with heading date, maturity, plant height, and number of unfilled grain/panicle.

The research was aimed to study yield and yield component trait association and salinity tolerance of rice genotypes under mild saline stress condition. The activity was done in Soge, Kandanghaur Indramayu district, West Java Indonesia, from July to November 2020. The material consisted of 150 genotypes including sixteen check varieties represented high yield popular rice varieties and salinity tolerance rice varieties. The alpha lattice design with two replications with a 4 m2 plot size was used in this experiment. A total of three seedlings that was twenty-one days old was manually transplanted in one hole with a 25 x 25 cm planting space. The result showed that under mild saline stress condition, there was no association between grain yield and salinity tolerance at the seedling stage. The grain yield positively correlated with a tolerance of genotype at the vegetative stage, plant height, tiller number, spikelet fertility and negatively associated with unfilled grain number. These traits can be used as indirect selection criteria for high grain yield under mild saline stress condition.

Plant breeders performed multi-trait selection using a suitable method, one of which is selection index. A multivariate analysis may be used for developing a selection index model. The objective of this experiment was to select doubled haploid rice lines with high yield potential and good agronomic characters based on the selection index. The experiment was carried out using a single factor completely randomized design with three replications, from August 2018 to December 2019. The study included 89 doubled haploid (DH) lines derived from anther culture as well as four check varieties (Ciherang, Inpari 30 Ciherang Sub1, Inpari 41, and Inpari 35 Agritan). Development of selection index model considered the results of analysis of variance, correlation analysis, path analysis, principal component analysis, and aimed plant ideotype. The findings revealed that there was variation in agronomic traits and yield among the DH lines tested. The selection index model can be formulated as I (index value) = 3*0.75 yield + 0.85 total grain per panicle – 0.85 plant height. Based on this model, 85 lines had index value and yield higher than Inpari 41. The selected DH lines were included in the subsequent field evaluation. Keywords: correlation, heritability, path analysis, variability

<p>Hawar Daun Bakteri (HDB) disebabkan oleh bakteri patogen, Xanthomonas oryzae pv. oryzae (Xoo), yang merupakan salah satu penyakit penting tanaman padi. Salah satu pengendalian yang efektif yaitu dengan penggunaan varietas tahan. Koleksi aksesi padi local siperlukan unntuk mendukung program perakitan varietas tahan penyakit HDB. Penelitian ini bertujuan untuk mengidentifikasi keragaman respons ketahanan padi lokal asal Jawa, Sumatra, dan Sulawesi terhadap penyakit HDB, patotipe III,<br />IV, dan VIII. Materi genetik yang digunakan adalah seratus aksesi plasma nutfah padi local asal Jawa, Sumatera, Sulawesi dan biakan murni bakteri Xanthomonas oryzae pv. oryzae (Xoo) patotipe III, IV, dan VIII. Evaluasi ketahanan dilakukan di Rumah Kaca BB Padi Sukamandi pada MT-1/MT-2 tahun 2016. Metode inokulasi dilakukan dengan pengguntingan daun dan skoring ketahanan berdasarkan SES IRRI tahun 2014. Evaluasi pada stadia vegetatif menunjukkan adanya keragaman respons ketahanan terhadap patotipe III (agak rentan−sangat rentan) dan VIII (rentan−sangat rentan). Sedangkan pada stadia generatif terdapat satu aksesi yang bereaksi agak tahan terhadap patotipe III yaitu Padi Terong (7782), yang merupakan aksesi padi lokal asal Jawa Barat. Padi lokal asal Jawa Barat terdeteksi memiliki keragaman respons ketahanan terhadap patogen HDB yang paling beragam.</p>

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