Analysis of genetic diversity in oilseed brassica germplasm through ISSR markers and isozyme profiling

Eleven Brassica germplasm were characterized through the application of 12 oligonucleotide Inter Simple Sequence Repeat (ISSR) primers. A total 1248 bands were amplified through polymorphic chain reaction and were visualized by agarose gel electrophoresis. Among the amplified marker bands 71.47% were polymorphic in nature and 352 bands were found to be monomorphic. The polymorphic bands of the amplified DNAs mostly ranged between 110 bp and 3 kb. Genetic distance among the germplasm ranged between 0.0468 and 0.7189. Moreover, three isozyme systems such as esterase, acid phosphatase and peroxidase were analyzed for allozyme variability that detected distinct 93 isozyme loci of which nearly 61.9% were polymorphic. Two dendrograms were constructed based on the ISSR profiling and isozyme data obtained through electrophoresis to find out the relatedness and phylogenetic relationship among the investigating Brassica germplasm. The clusters of the phylogenetic tree revealed 4 distinct groups of Brassica based upon their ISSR banding patterns and isozyme analysis. Nei’s genetic distance analysis provided strong information about the existence of variability among the germplasm of Brassica. All the germplasm was found to be clustered according to their respective species. Brassica carinata (Ethiopian mustard) showed individuality from all the germplasm studied and made a different branch in the phylogenetic tree suggesting its diverse origin. From the clustering pattern and genetic relationship obtained with ISSR markers and isozyme analysis, breeders can successfully identify the diverse germplasm from different cluster and use them in their future breeding program.

Analisis Isozim dan Patogenisitas Isolat Cladosporium spp. Terhadap Karat Putih Pada Krisan (Isozyme Analysis and Pathogenicity of Cladosporium spp. Isolate Against White Rust on Chrysanthemum)

<p><em>Cladosporium</em> spp. merupakan mikoparasit potensial untuk mengendalikan beberapa jenis cendawan karat. Penelitian bertujuan untuk mengetahui patogenisitas 10 isolat Cladosporium spp. yang ditemukan di daerah sentra krisan (Kabupaten Cianjur dan Bandung Barat) terhadap penyakit karat putih pada krisan dan hubungan kekerabatannya antara isolat Cladosporium spp. Percobaan dilakukan pada bulan April hingga Agustus 2014 di Laboratorium Mikologi Balai Penelitian Tanaman Hias (Balithi) dan Laboratorium Patologi dan Silvikultur, Fakultas Kehutanan, Institut Pertanian Bogor. Pada percobaan ini dilakukan uji patogenisitas 10 isolat Cladosporium spp. asal Kabupaten Cianjur dan Bandung Barat terhadap pustul karat pada daun krisan di laboratorium. Untuk menelusuri hubungan genetik antarisolat dilakukan analisis isozim secara elektroforesis dengan menggunakan enzim esterase (EST), acid phospatase (ACP), dan peroksidase (PER). Hasil percobaan menunjukkan sembilan isolat Cladosporoium spp. efektif memparasit pustul karat dengan efektivitas lebih dari 50%. Hasil analisis isozim menunjukkan terdapat dua kelompok Cladosporium spp. yang memiliki koefisien kemiripan 67%.</p><p><strong>Keywords</strong></p><p><em>Cladosporium</em> spp.; Isozim; Mikoparasit; Patogenisitas</p><p><strong>Abstract</strong></p>Cladosporium spp. is a potential mycoparasite for controlling some rust fungi. The aim of the research was to obtain the effectiveness of 10 Cladosporium spp. isolates was found in chrysanthemum central area (Cianjur and West Bandung District) and genetic relationship among the isolats. The research carried on April to Agustus 2014 in Micology Laboratory Indonesian Ornamental Crop Institute and Pathology and Silviculture Laboratory, Faculty of Forestry, Bogor Agricultural University. Pathogenicity of the 10 fungus isolate was tested against rust pustules on chrysanthemum leaves and genetic relationship between isolates was analyzed by electrophoresis isozyme using EST, ACP, and PER enzyme. The results showed that nine of Cladosporoium spp. isolates were effective parasited rust pustule with more than 50% effectiveness. The cluster analysis based on isozyme analysis showed that Cladosporium spp. isolate have two distinc groups with 67% similarity coefficient.

Isozyme analysis of genetic variability and population structure of Lathyrus sativus L. germplasm

This work aimed at exploring the genetic variability, population structure and relationships of Lathyrus sativus L. germplasm using isozyme analysis. The data of isozyme analysis revealed 12 putative polymorphic loci of a total 33 alleles, indicating that studied accessions express good allelic richness and had an apparent rate of allogamy. The mean average of the expected heterozygosity (0.483) was more than the mean average of the observed heterozygosity (0.449) suggesting an apparent rate of allogamy taking place in Lathyrus sativus L. The average of total heterozygosity (HT) and intra-accessional genetic diversity (HS) were 0.559 and 0.428 respectively indicating that majority of genetic diversity was intra-accessional. The low levels and non-significant of genetic diversity among accessions (DST = 0.190, X2 = 62.59, p = 0.029) were probably indicative of occurrence of several gene flows. The coefficient of gene differentiation (GST) showed significant variation, suggesting the heterogonous distribution of L. sativus accessions among different geographic regions. The mean average of FST was 0.327, suggesting the occurrence of random mating system for the studied accessions and reflecting adaptation to strong environmental dissimilarities. Cluster analysis based on isozyme data suggested that the environment had no influence on the genetic diversity and confirmed that Lathyrus sativus L. had a polyphyletic origin.

Genetic Variability of Five Provenances of Eboni

A research was conducted to determine genetic variability and structure of ebony either within provenances or within trees in the same provenance using isozyme analyses. Results of this study are expected to show genetic variability of ebony with different provenances. For the purpose of the study, five provenances of ebony (Maros,Barru, Sidrap, Malili, and Mamuju) were prepared. The isozyme analysis using electrophoresis was applied to determine the genetic variability. The obtained data were statistically analyzed using multivariate and dendrogram analyses with Numerical Taxonomy System (NTSYS) Program applying unwighted pairgroup method and arrithmetic average (UPGMA) approach. Results showed that the variability of genetic provenances of ebony were less than any other tree species. Among the existing provenances, Barru dan Mamuju showed higher genetic variability compared to other provenances. Ebony provenance was generally found to homozygously increase or to performinbreeding. The genetic variability of ebony was mostly derived from the variability in population (95.4%). Grouping individual trees based on their provenances indicated that Malili provenance showed closed relationship to Maros provenance, whilst Mamuju provenance showed closed relationship to Barru and Sidrap provenances.

Genetic potential of cassava biodiversity in Bangka Island, Indonesia

Lestari T, Apriyadi R. 2017. Genetic potential of cassava biodiversity in Bangka Island, Indonesia. Cell Biol Dev 2: 41-45. Cassava is potential as a mixture ingredient of flour in the Bangka’s food industry. This study aimed to discover the biodiversity of local cassava in Bangka. This research was conducted in experimental field of the Faculty of Agriculture, University of Bangka Belitung, Indonesia from July 2015 to July 2016. The experimental design was randomized block design with 10 local cassavas of Bangka that consisted of upang, sekula, bayel, mentega, kuning, batin, pulut, sutera, rakit, and Selangor. Isozyme analysis performed using starch gel electrophoresis with horizontal models. Analysis for five Bangka local cassava varieties and one National cassava variety used RAPD group OP A and OP B. The results showed that the phenotypic performance was different on the type of plant, the morphology of leaves, stems, and tubers of local cassava of Bangka. Isozyme analysis showed polymorphic banding pattern, while the eight RAPD primers used did not produce polymorphic. This research showed Bangka local cassava morphologically different based on visual observation. Morphological character of Bangka local cassava leaf was divided into three shapes of lobe: ellipse (upang, sekula, bayel, mentega, batin, pulut, rakit, Selangor), linear (kuning) and lanceolate (sutera). This research data showed that the genetic diversity of local cassava in Bangka relatively high. Bangka local cassava has genetic potential as plant propagation material for plant breeding.