检索结果-南通市图书馆

Morphological and Genetical Variability among Rhizoctonia solani Isolates Causing Sheath Blight Disease of Rice

在线全文

学校读者我要写书评

暂无评论

Rice science 2016年第1期23卷 42-50页

作者： Zakiah Rahman MONI Md Ansar ALI Md Shahidul ALAM Md Asif RAHMAN Md Rejwan BHUIYAN Md Salim MIAN Khandakar Md IFTEKHARUDDAULA Md Abdul LATIF Mohammad Ashik Iqbal KHAN plant breeding division Bangladesh Rice Research Institute Director Research Bangladesh Rice Research Institute Department of Botany Rajshahi University Department of genetics and plant breeding Bangabandhu Sheikh Mujibur Rahman Agricultural University plant Pathology division Bangladesh Rice Research Institute

Eighteen isolates of Rhizoctonia solani collected from infected rice plants in four different locations of Bangladesh were studied by using morphological characters and molecular markers. Anastomosis study with a reference isolate confirmed that all the isolates belonged to R. solani. Significant variation was observed in sclerotial size, shape and distribution. Un-weighted pair group method with arithmetic mean dendrogram constructed based on the Gower＇s general similarity coefficient showed that these isolates were grouped into four clusters at the 0.68 similarity coefficent according to morphological characters. Cluster I was a major cluster consisting of 13 isolates, while clusters Ⅱ to Ⅳ consisted of 1 or 2 isolates. Analyses by variable number of tandem repeat and amplified fragment length polymorphism markers showed that the isolates were grouped into five and three clusters at a similarity coefficient of 0.64 and 0.69, respectively. Although most of the variability was found between isolates from different regions as expected, significant variation was observed within the isolates collected from similar agro-ecological regions. Our results suggest the presence of different races of R. solani within the same local geographic regions.

关键词： rice Rhizoctonia solani fungal variability molecular marker morphological character

Development of New Submergence Tolerant Rice Variety for Bangladesh Using Marker-Assisted Backcrossing

在线全文

学校读者我要写书评

暂无评论

Rice science 2015年第1期22卷 16-26页

作者： Khandakar Md IFTEKHARUDDAULA Helal Uddin AHMED Sharmistha GHOSAL Zakiah Rahman MONI Al AMIN Md Shamsher ALI plant breeding division Bangladesh Rice Research Institute

Submergence tolerant high yielding rice variety was developed using BR11 as a recipient parent applying foreground, phenotypic and background selection approaches. Recombinant selection was found essential to minimize linkage drag by BC2F2 generation. Without recombinant selection, the introgression size in the backcross recombinant lines （BRLs） was approximately 15 Mb on the carrier chromosome. The BRLs were found submergence tolerance compared to the check varieties under complete submergence for two weeks at Bangladesh Rice Research Institute, and produced higher yield compared to the isogenic Subl-line under controlled submerged condition. The BRL IR85260-66-654-Gaz2 was released as BRRI dhan52 in 2010, which was the first high yielding submergence tolerant variety in Bangladesh. BRRI dhan52 produced grain yield ranging from 4.2 to 5.2 t/hm2 under different flash flood prone areas of Bangladesh in three consecutive seasons. The study demonstrated the efficiency of recombinant selection and better adaptability of the newly released submergence tolerant high yielding variety in flash flood prone different areas of the country with respect to submergence tolerance and yield potential.

关键词： backcross recombinant line marker-assisted backcrossing recombinant selection rice submergence tolerance

Yield Traits and Associated Marker Segregation in Elite Introgression Lines Derived from O. sativa × O. nivara

在线全文

学校读者我要写书评

暂无评论

Rice science 2018年第1期25卷 19-31页

作者： G.HARITHA B.P.M.SWAMY M.L.NAIK B.JYOTHI B.DIVYA S.MALATHI N.SARLA Indian Council of Agricultural Research Indian Institute of Rice Research plant breeding Genetics and Biotechnology Division International Rice Research Institute

Introgression lines(ILs)derived from interspecific crosses are a source of new genetic variability.A total of 55 ILs derived from two crosses Swarna×*** IRGC81848(population A)and Swarna×*** IRGC81832(population B)were characterized for yield and yield-related traits/*** of 103 simple sequence repeat(SSR)markers associated with yield-related QTLs was *** A showed an average of 12.6%homozygous *** alleles and population B showed 10.6%.Interestingly,three SSR markers,RM223,RM128 and RM517,showed conspicuous pattern of *** distribution of parental alleles at three loci RM223,RM128 and RM517 linked to yield-related traits was *** markers flanked to several yield-related ***223,flanking to qyld8.3,was heterozygous in almost all the 55 ILs except in IL10-3S and ***128 on chromosome 1 and RM517 on chromosome 3 were mutually exclusive in 46 out of 55 *** 46 ILs showed either of the marker allele RM128 or RM517 from *** but not ***166S had both RM128and RM517 from *** and the other ILs showed homozygous Swarna allele at RM517 except *** structure assigned the 55 ILs to three sub-populations based on their genomic ***65S,IL166S,IL248S,IL7K and IL250K showed high yields in multi-location trials,and IL248S was released for cultivation as DRRDhan 40.

关键词： introgression line heterozygosity Oryza nivara wild rice population structure yield simple sequence repeat

Haplotype Diversity at Sub1 Locus and Allelic Distribution Among Rice Varieties of Tide and Flood Prone Areas of South-East Asia

在线全文

学校读者我要写书评

暂无评论

Rice science 2017年第4期24卷 198-206页

作者： A.S.M.MASUDUZZAMAN Md.Maksudul HAQUE A.K.M.SHAMSUDDIN M.A.SALAM Md.Ansar ALI plant breeding division Bangladesh Rice Research InstituteGazipur 1701Bangladesh Scientific Officer(Golden Rice) Plant Breeding DivisionBangladesh Rice research InstituteGazipur 1701Bangladesh Department of genetics and plant breeding Bangladesh Agricultural UniversityMymensingh 2202Bangladesh Director Research Bangladesh Rice Research InstituteGazipur 1701Bangladesh

Single nucleotide polymorphisms and restriction digestion-based haplotype variations among 160 flood prone rice varieties were analyzed with enzymes Alu I and Cac8 I to generate polymorphisms at Sub1A and Sub1C loci （conferring submergence tolerance）, respectively. Haplotype associated with phenotype was used to study the haplotype variations at Sub1A and Sub1C loci and to determine their functional influence on submergence tolerance and stem elongation. Three patterns at Sub1A locus, Sub1A0 （null allele）, Sub1A1 （does not cut） and Sub1A2 （one SNP）, and four patterns at Sub1C locus, Sub1C1, Sub1C2, Sub1C3 and Sub1C4, were generated. Both tolerant Sub1A1 and intolerant Sub1A2 had the same length, but the difference was presence of a restriction site in the Sub1A2, but absent at the Sub1A1. Further, two types of polymorphism were detected at the Sub1C, one included major length polymorphisms （165, 170 and 175 bp） and the other was a single restriction site at different position. Eight haplotypes （different combinations of the two loci）, A1C1, A1C2, A1C4, A2C2, A2C4, A0C2, A0C3 and A0C4, were detected among 160 varieties. Haplotype A1C1 was comparatively more related to haplotypes A1C2 and A1C4, having the same Sub1A allele, and these haplotypes were found only in Bangladeshi, Sri Lankan and Indian varieties. Most tolerant varieties in A1C1 haplotype showed slow elongation, having tolerant specific Sub1A1 and Sub1C1 alleles. Further, the varieties Madabaru and Kottamali （A2C2） also showed moderate level of tolerance without Sub1A1 allele. These varieties were different with FR13A and also suspected to carry different novel tolerant genes at other loci. These materials could be used for hybridization with Sub1 varieties for pyramiding additional tolerant specific alleles into a single genotype for improving submergence tolerance in rice.

关键词： haplotype Sub1 allele single nucleotide polymorphism submergence

Development and transferability of two multiplexes nSSR in Scots pine(Pinus sylvestris L.)

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2015年第2期26卷 361-368页

作者： Stefana Ganea Sonali S.Ranade David Hall Sara Abrahamsson Maria Rosario Garcia-Gil Department of Forest genetics and plant Physiology SLU901 83 UmeaSweden Department of genetics and plant breeding USAMV400372 Cluj-NapocaRomania

Single sequence repeat（SSR） multiplexing is a semi high-throughput PCR methodology for the analysis of multiple *** developed two SSR multiplexes selected from SSR loci previously reported in the pine literature and tested the transferability of both SSR multiplexes in nine other pine *** tested 234 nuclear SSR loci（n SSRs） previously described in the pine literature and selected ten n SSRs following the simple criteria of interpretability and *** nuclear loci were divided into two n SSRs multiplex sets and their amplification was optimized for three different multiplex PCR methods based on：（a） a custom PCR protocol,（b） a custom protocol with hotstart taq polymerase,and（c） a commercially available kit for SSR *** validate their performance,the level of genetic diversity was assessed in three Scots pine natural populations（Hungary,northern Sweden and southern Sweden）.In addition,we also tested the transferability of these multiplexes in nine other pine *** have developed two n SSRs multiplexes of five loci each that will contribute to reduce the costs of n SSR scoring,while increasing the capacity of n SSR loci *** was successful in all three populations（94 % success） and the level of polymorphism（7.1 alleles/marker） was similar to that previously reported for other Scots pine natural *** of both multiplexes was successful for those pine species closely related to Scots pine.

关键词： Genetic diversity Nuclear SSR SSR multiplex Scots pine

Laboratory-and Field-Phenotyping for Drought Stress Tolerance and Diversity Study in Lentil (Lens culinaris Medik.)

在线全文

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2021年第3期90卷 949-970页

作者： Shahida Akter Israt Jahan MdAmir Hossain Mohammad Anwar Hossain Department of genetics and plant breeding Bangladesh Agricultural UniversityMymensingh2202Bangladesh

Drought susceptibility and low genetic variability are the major constraints of lentil(Lens culinaris Medik.)production *** of an efficient pre-field drought phenotyping technique and identification of diversified drought tolerant lentil genotype(s)are therefore vital and *** separate experiments were conducted using thirty diverse lentil genotypes to isolate drought tolerant genotype(s)as well as to assess their *** both of the experiments,significant(p≤0.01)variation in genotype(G),treatment(T)and G X T was observed for most of the studied *** experiment I,genotypes were examined for drought tolerance at the seedlings stage under hydroponic conditions by assessing root and shoot *** the 30 genotypes studied,BM-1247,BM-1227 and BM-502 were selected as highly tolerant to drought stress as they showed maximum seedling survivability and minimum reduction in growth parameters under drought *** experiment II,the genotypes were assayed for diversity and drought stress tolerance based on morphological traits grown under field *** stress caused a substantial reduction in yield attributing traits,however,the genotypes BM-1247,BM-981,BM-1227 and BM-502 were categorized as drought tolerant genotypes with less than 20%yield *** field screening result of drought stress tolerance was coincided well with the results of laboratory *** divergence study reflected the presence of considerable diversity among the *** laboratory and field screening results,the genotypes,BM-1247,BM-1227,BM-981 and BM-502 were selected as the best drought tolerant *** information can be exploited for further breeding in developing drought tolerance in lentil.

关键词： Lentil water stress seedling survival yield attributing traits phenotypic diversity

Identification and fine mapping of quantitative trait loci for the number of vascular bundle in maize stem

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative plant Biology 2016年第1期58卷 81-90页

作者： Cheng Huang Qiuyue Chen Guanghui Xu Dingyi Xu Jinge Tian Feng Tian Department of plant genetics and breeding National Maize Improvement Center of China China Agricultural University

Studies that investigated the genetic basis of source and sink related traits have been widely ***, the vascular system that links source and sink received much less attention. When maize was domesticated from its wild ancestor, teosinte, the external morphology has changed dramatically; however, less is known for the internal anatomy changes. In this study, using a large maize-teosinte experimental population, we performed a high-resolution quantitative trait locus（QTL） mapping for the number of vascular bundle in the uppermost internode of maize *** results showed that vascular bundle number is dominated by a large number of small-effect QTLs, in which a total of 16 QTLs that jointly accounts for 52.2% of phenotypic variation were detected, with no single QTL explaining more than 6% of variation. Different from QTLs for typical domestication traits, QTLs for vascular bundle number might not be under directional selection following *** Near Isogenic Lines（NILs） developed from heterogeneous inbred family（HIF）, we further validated the effect of one QTL qVb9-2 on chromosome 9 and fine mapped the QTL to a 1.8-Mb physical region. This study provides important insights for the genetic architecture of vascular bundle number in maize stem and sets basis for cloning of qVb9-2.

关键词： Fine-mapping genetic architecture maize quantitativetrait locus vascular bundle number

breeding Potential of Some Exotic Tomato Lines:A Combined Study of Morphological Variability,Genetic Divergence,and Association of Traits

在线全文

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2022年第1期91卷 97-114页

作者： Shafiul Islam Lutful Hassan Mohammad Anwar Hossain Department of genetics and plant breeding Bangladesh Agricultural UniversityMymensingh2202Bangladesh

Tomato(Solanum lycopersicum L.)is called‘the poor man’s orange’due to its low price and improved nutritional *** experiment was conducted to study the breeding potential of some exotic tomato lines by assessing various qualitative and quantitative traits conferring yield and quality *** the qualitative traits,greater variability was observed for growth type,stem hairiness,and fruit shape and size.A determinate growth habit was observed in the genotype AVTO9802 while the genotype AVTO0102 produced yellow color fruits.A significant(p≤0.01)variation was also observed for the studied quantitative *** on yield and traits attributed to yield,the genotypes AVTO0314,GPB0107,GPB0120 and AVTO9802 were selected as promising *** differences between the genotypic and phenotypic coefficients of variation(GCV and PCV)of the studied quantitative traits were very *** suggests that the apparent variation was mainly due to the *** higher GCVand PCV values were observed for the number of primary branches plant^(−1)(NPB),number of fruits cluster^(−1)(NFC),individual fruit weight(IFW)and total soluble solids(TSS).High heritability was recorded for all quantitative traits in a broad ***,the individual fruit diameter showed the highest heritability(99.56).The highest(102.75)genetic advance(GA)was observed for the number of fruits plant^(−1)(NFP).High heritability coupled with high GA as percentage of mean were recorded for the traits NFP,NFC,fruit yield plant^(−1)(FYP)and *** showed a significant positive correlation with NFC(0.714^(***))and a negative correlation with days to the first harvest(−0.539^(***))and plant height(−0.492**).Principal component analysis revealed that the first four components explained 78.5%of the total variation among the ***,the promising genotypes(AVTO0314,GPB0107,GPB0120,AVTO9802 and AVTO0102)isolated from this study can be used for developing high-yielding and high-quality tomato va

关键词： Tomato yield and quality traits genetic advance heritability correlation coefficient principal component analysis

Proteomic Profiling and Protein-Protein Interaction Network Reveal the Molecular Mechanisms of Susceptibility to Drought Stress in Canola(Brassica napus L.)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2022年第7期91卷 1403-1417页

作者： Reza Shokri-Gharelo Ali Bandehagh Mohammad Anwar Hossain Department of plant breeding and Biotechnology University of TabrizTabriz51368Iran Department of genetics and plant breeding Bangladesh Agricultural UniversityMymensingh2202Bangladesh

Drought stress is one of the most important abiotic stresses that plants face frequently in *** drought conditions,many morphological,physiological,and molecular aspects of plants are changed and as a result plants experience a remarkable reduction in growth,yield,and *** expand our understanding of the molecular basis of the plant response to drought stress,the proteomic profile and protein-protein network of canola(Brassica napus L.)were *** focus was to show molecular mechanisms related to canola susceptibility to drought *** experiment used a completely randomized design,implemented in a hydroponic system under greenhouse *** impose drought stress,plants were exposed to Hoagland’s solution supplemented with polyethylene glycol(PEG)6000 for 7 *** drought stress resulted in 161reproducible protein spots in twodimensional electrophoresis of canola *** t-student test showed 21 differentially abundant proteins(DAP),of which 2 and 19 were up and down accumulated,*** spots identified as 1-aminocyclopropane-1-carboxylate oxidase and D-2-hydroxyglutarate dehydrogenase showed an increased abundance of 2.11 and 1.77,*** extended protein-protein interaction of differentially abundant proteins and KEGG analysis showed 47 pathways directly and indirectly associated with canola response to drought *** with increased abundance were associated with amino acid and signaling processes,whereas DAPs with decreased abundance were mostly connected with pathways responsible for energy *** results of the study will help to elucidate further the molecular events associated with the susceptibility to drought stress in canola.

关键词： Abiotic stress differentially abundant protein molecular function proteomics susceptibility