ADAPTABILITAS DAN STABILITAS PRODUKSI IKAN MAS MUSTIKA DI LINGKUNGAN BUDIDAYA BERBEDA

Salah satu varietas unggul ikan mas adalah “Mustika”. Varietas ini merupakan hasil seleksi berbasis marka molekuler untuk karakter tahan penyakit KHV (Koi Herpesvirus). Pengembangan ikan mas Mustika di masyarakat memerlukan informasi terkait performa fenotipe varietas tersebut di lingkungan budidaya yang beragam. Penelitian ini bertujuan mengevaluasi adaptabilitas dan stabilitas produksi ikan mas Mustika pada beberapa kondisi lingkungan budidaya. Penelitian dilakukan di empat lokasi dengan dua model sistem budidaya berbeda, yaitu karamba jaring apung (KJA) di tiga lokasi (Waduk Cirata, Cianjur; Waduk Jatiluhur, Purwakarta; dan Waduk Darma, Kuningan) serta di kolam air deras (KAD) di Tanjungsiang, Subang. Ikan mas Majalaya yang berasal dari unit pembenihan rakyat (UPR) di masing-masing lokasi uji digunakan sebagai pembanding. Penelitian dilakukan selama 90 hari dengan tiga kali pengulangan. Berdasarkan hasil penelitian ini, ikan mas Mustika mempunyai daya adaptabilitas dan stabilitas yang baik pada semua kondisi lingkungan budidaya. Hal ini diindikasikan dengan nilai koefisien regresi (bi) karakter daya hasil panen tidak berbeda nyata dengan satu dan simpangan baku koefisien regresi (S2di) sama dengan nol. Berdasarkan hasil tersebut, budidaya ikan mas Mustika tidak membutuhkan spesifikasi lokasi tertentu dan dapat dilakukan di semua lokasi budidaya.“Mustika” is a new superior common carp variety genetically selected as KHV (Koi Herpesvirus) resistant. This research was conducted to evaluate the adaptability and production stability of the fish strain in different farming systems and sites. The treatments consisted of culturing the fish strain at four locations with two different culture systems, that is in floating net cage at three locations (Cirata Reservoir, Cianjur; Jatiluhur Reservoir Purwakarta; and Darma Reservoir, Kuningan) and in a running water pond (KAD) at Tanjungsiang, Subang. Majalaya carp produced from a local hatchery (U.P.R.) in each location was also cultured as the control treatment. All treatments in this experiment were conducted for 90 days with three replications. The results showed that Mustika common carp has high adaptability and production stability in all culture systems and sites. Such results were indicated by the coefficient of regression (bi) of biomass at harvest was not significantly different from 1.0, and the standard deviation of regression (S2di) was zero. Based on these results, it is concluded that the culture of Mustika common carp does not require a strict or specific culture system and can be farmed in most of suitable culture environment

Interaksi Genotipe x Lingkungan 31 Genotipe Jagung Hibrida (Zea mays L.) di Lokasi Blitar dan Situbondo, Jawa Timur

Pertumbuhan dan potensi hasil suatu tanaman dipengaruhi oleh adanya interaksi genotipe dan lingkungan. Penelitian ini memiliki tujuan untuk mengetahui interaksi genotipe dan lingkungan serta genotipe yang mampu beradaptasi di dua lokasi pada 31 genotipe jagung hibrida, Penelitian dilaksanakan pada bulan Januari–April 2020 di Desa Binangun, Kecamatan Binangun, Kabupaten Blitar dan di Desa Tanjungkamal, Kecamatan Mangaran, Kabupaten Situbondo Penelitian ini menggunakan rancangan Augmented Design terdiri dari 34 entri/perlakuan (18 genotipe yang diuji, 9 varietas pendamping) tanpa ulangan dan 4 varietas sebagai control (diagonal check) diulang sebanyak 3 kali. Varietas yang digunakan sebagai control ialah  P13, P35, P,36, dan P37. Analisis Ragam dengan uji F, uji lanjut DMRT (Duncan Multiple Range Test) pada taraf 5% dan analisis stabilitas metode Finlay dan Wilkinson (1963). Analisis ragam gabungan menunjukan interaksi genotipe dan lingkungan tidak terjadi perbedaan nyata pada karakter pengamatan tinggi tanaman (cm), tinggi tongkol (cm), kadar air (%), pe

Stabilitas Hasil Jagung Varietas Hibrida Harapan Umur Genjah

Maize yield represents the interaction between genotype and environment. An excellent genotype should have high mean yield and small variation across common locations.This information could be obtained through yield performance test and stability analysis of yield data obtained from multilocation trials. This research was aimed to find out yield stability of eight early maturing maize promising lines at five sites using the AMMI method. There were total 12 genotypes of maize hybrids used in this research, consisted of eight hybrids (CH-1, CH-2, CH-3, CH-4, CH-5, CH-6, CH-7, and CH-8) and four check varieties (Gumarang, Bima 3, AS-1, and Bisi 2). This research was conducted at five locations ie. Gowa (South Sulawesi), Donggala (Central Sulawesi), Manado (North Sulawesi), Probolinggo (East Java) and Lombok Barat (West Nusa Tenggara) from April to September 2013. The treatments were arranged in a randomized complete block design (RCBD) with 3 replications. Variable measured was grain yield at all trial locations. Analysis of variance was performed for each site data to determine the performance of each genotype at each location. Results showed that genotype CH-2, CH-4 and CH-6 were considered as stable genotypes. Genotype CH-2 and CH-4 have a potensial to be released as new early maturing variety, due to its high yield of 8.71 and 7.52 t/ha averaged over 5 locations. Genotype CH-6 yielded below the mean yield of all genotypes, while genotype CH-8 was adaptive to a specific location, such as in Donggala, with yield of 8.38 t/ha

Yield Performance And Adaptation Of Promising Amphibious Red Rice Lines On Six Growing Environments In Lombok, Indonesia

The objectives of this study were to examine yield performance of promising amphibious red rice lines, and to evaluate their adaptability to six growing environments in Lombok, Indonesia. Ten promising amphibious red rice lines were tested together with their three parents and one national cultivar (Aek Sibundong), during the rainy extended to dry season 2014 (January-June 2014). The ten promising lines were obtained from two population sources, while the three parents were AKBC52, AKBC86, and a local cultivar, i.e. Kala Isi Tolo (KIT). The testing environments were lowland in Mambalan village (West Lombok), medium highland in Mantang village (Central Lombok), and highland in East Sembalun village (East Lombok), and each location consisted of two systems, i.e. flooded and dry (upland) systems. The experiment in each environment was designed according to Randomized Complete Block Design, with three replications and 14 genotypes as the treatments. Adaptation analysis was based on ANOVA using AMMI and Biplot. The results indicated that among the 14 genotypes, G10(F2BC4A52-42) showed the highest yield, with an average of 7.8 t ha-1 dry seeds. There was a significant Genotype x Environment interaction on the dry seed yield. Biplot analysis indicated that G2(F2BC4A52-44) and G8(F2BC4A52-37

Nonparametric Stability Analysis of Starch Content of Gamma Irradiated Cassava at Three Locations in West Java, Indonesia

Cassava is one of the largest starch producing tuber crops in Indonesia. Tapioca from cassava starch can be used as a raw materials for a variety of foods including biscuits, instant porridge, meatball, sausage, nuggets, and flour condiment. Breeding programs to improve cassava yield and starch content by using mutagen gamma rays irradiation was tested in four cassava generations (M1V4). Cassava is propagated by stem cuttings and the new characteristic obtained from gamma irradiation mutation is stable and can be passed from one generation to the next. Cassava mutants were obtained by evaluating the performance in different environmental conditions. The testing of yield adaptability and stability through a series of multi location is an important step before a new variety can be released. The aim of this research was to compare nonparametric stability and to evaluate the stability of the starch content of 16 genotypes (14 mutants and 2 varieties) in three locations in West Java Province i.e. Tapos (Depok), Cikarawang (Bogor), and Ciseeng (Bogor). Experiments were conducted in a completely randomized block design with three replications nested in each environment. Testing of yield stability in this study used four approaches with 10 parameters of nonparametric method. Starch content was estimated using gravimetric method. Based on frequency stability ranking of starch content from gravimetric method the G63142 genotype had the highest starch content estimation (29.99%), and the top five genotypes with high starch content were G63142, G61142, “Manggu”, G62151, and G63124. G61142 was categorized as genotype with static and dynamic stability, therefore this genotype is a very potential mutant to be released, whereas G63124 is categorized as a genotype with a static stability. Genotypes G63142, G62151, and “Manggu” had variable but relatively high starch content

Four-way data analysis within the linear mixed modelling framework

Cultivars have to be evaluated under different crop management systems across agro-ecosystems and years using multi-environment trials (MET) before releasing them to the market. Frequently, data collected in METs are arranged according to cultivar (G), management (M), location, (L) and year (Y) combinations in a four-way G x M x L x Y data table that is highly unbalanced for cultivars across locations and time. Therefore, we present the restricted maximum likelihood method (REML) for linear mixed models (LMM) with a factor analytic variance-covariance matrix for assessing cultivar adaptation to crop management systems and environments based on unbalanced datasets. Such a multi-environmental trial system has been in operation in Poland for winter wheat (Triticum aestivum L.) in the form of the Post-registration Variety Testing System (PVTS). This study aimed to illustrate the use of LMM in the analysis of unbalanced four-way G x M x L x Y data. LMM analysis provided adjusted means of grain yield for 51 winter wheat cultivars bred in different regions in Europe, tested across 18 trial locations and seven consecutive cropping seasons in two crop management intensities. The application of the four-way LMM with a factor analytic variance-covariance matrix is a complementary and effective tool for evaluating the unbalanced G x M x L x Y table. Cultivars tested had different adaptive responses to the Polish agro-ecosystems separately for each of the crop management intensities. Wide adaptation in both crop management systems was exhibited by cultivars Mulan and Jenga bred in Germany

Effects of mental fatigue on reaction time in sportsmen

Mental fatigue (MF) has been defined as a psychobiological state commonly caused by prolonged periods of demanding cognitive activity. However, the differences between women and men in their reaction times (RTs) to visual stimuli due to mental fatigue remain largely unknown. We compare the differences in RT and heart rate after an acute intervention of mental fatigue between male and female athletes