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Selection parameters for improving the seed cotton yield and fibre quality traits in American Cotton (Gossypium hirsutum L.)
K. N. Ganesan and T. S. Raveendran
Electronic Journal of Plant Breeding , 2010,
Abstract: Information on the influence of different yield components on improvement of yield will be crucial in any selectionprogramme. Four intra-hirsutum hybrids viz., TCH1452 x MCU5, TCH1628 x Gh493, TCH1628 x MCU5 and SVPR2 xMCU5 were developed by utilizing the five genetically diverse American cotton (Gossypium hirsutum L.) genotypes asparents. Observations were recorded on plant height, boll number, boll weight, ginning outturn, lint index, seed index, 2.5%span length, bundle strength, fibre fineness, elongation % and seed cotton yield in F2 population and correlation of yield andits components were analysed to understand the relative contribution of different yield components in enhancing the yieldand fibre quality. Study revealed significant positive association of plant height, sympodia, boll number, boll weight withyield. Span length had highly significant negative association with yield whereas uniformity ratio exhibited both positivelyand negatively significant association with yield. Associations of fibre fineness, fibre strength and elongation % with seedcotton yield was non-significant. Association of traits inter se revealed the positive association of plant height withsympodia, uniformity ratio, 2.5% span length and number of bolls, sympodia with uniformity ratio and boll number, bollweight with uniformity ratio, seed index with ginning %, fibre length with bundle strength, uniformity ratio with micronaireand elongation %. Significant negative correlation of bolls with fibre strength and 2.5% span length, lint index with 2.5%span length and ginning %, fibre length with uniformity ratio and elongation %, micronaire with fibre strength was observed.Information generated on the relationship between yield components, fibre quality and yield in F2 generation will help thecrop breeder in enhancing the efficiency of selection.
Gene action study in some fibre traits in cotton (Gossypium hirsutum L.)  [PDF]
Muhammad Shahid Mukhtar,Tariq Manzoor Khan,Abdus Salam Khan
Pakistan Journal of Biological Sciences , 2000,
Abstract: A complete diallel cross experiment involving four cotton genotypes was conducted to ascertain the genetic basis of variation in some fibre traits. Additive type of gene action with partial dominance was observed for fibre fineness, fibre uniformity ratio and fibre elongation whereas over dominance type of gene action was operative for fibre strength and fibre maturity. Non allelic interaction was absent in the inheritance of all these traits. It is suggested that partial dominance with additive gene action for the characters under study, selection would be very useful in the early segregating generation.
Genetics of fibre quality traits in cotton (Gossypium hirsutum L.)
Muhammad Amjad Ali,Iftikhar Ahmad Khan,Shahid Iqbal Awan,Shiraz Ali
Australian Journal of Crop Science , 2008,
Abstract: Five upland cotton varieties were crossed in a complete diallel mating system to assess the genetics of fibre length (FL), fibre strength (FS), fibre fineness (FF), fibre uniformity (FU) and fibre elongation (FE) utilizing Mather and Jinks approach. Differences were found to be significant (P<0.01) for all the characters. Adequacy tests revealed that data of all the characters were partially adequate for genetic interpretation except FE. Additive component (D) was significant in all the traits and was lower in magnitude than dominant components (H1 and H2) of variation for FS and FU which was firmly supported by the value of H1/D0.5. Dominant genes were in excess than recessive genes in the parents for all the traits except for FF. Asymmetrical distribution of dominant and recessive genes in parents for all characters was confirmed, and soundly sustained by the value of H2/4H1. The h2 value was insignificant for all the characters except FS. Moderately high narrow sense heritability (h2n.s) was exhibited by FF, FU and FE, while SL and FS possessed low heritability. Graphical representation demonstrated additive gene action for SL, FF, and FE whereas; FS and FU were controlled by overdominance effects. Full sib or half sib family selection, pedigree and progeny test would probably be necessary to achieve the genetic progress for SL, FF, and FE while hetrosis breeding could be fruitful for improvement of FS and FU.
QTL mapping for physiology, yield and plant architecture traits in cotton (Gossypium hirsutum L.) grown under well-watered versus water-stress conditions
Saeed,Muhammad; Guo,Wangzhen; Ullah,Ihsan; Tabbasam,Nabila; Zafar,Yusuf; Mehboob-ur-Rahman,; Zhang,Tianzhen;
Electronic Journal of Biotechnology , 2011,
Abstract: increasing scarcity of irrigation water is a major threat to sustainable production of cotton (gossypium hirsutum l.). identifying genomic regions contributing to abiotic stress tolerance will help develop cotton cultivars suitable for water-limited regions through molecular marker-assisted breeding. a molecular mapping f2 population was derived from an intraspecific cross of the drought sensitive g. hirsutum cv. fh-901 and drought tolerant g. hirsutum cv. rh-510. field data were recorded on physiological traits (osmotic potential and osmotic adjustment); yield and its component traits (seedcotton yield, number of bolls/plant and boll weight); and plant architecture traits (plant height and number of nodes per plant) for f2, f2:3 and f2:4 generations under well-watered versus water-limited growth conditions. the two parents were surveyed for polymorphism using 6500 ssr primer pairs. joinmap3.0 software was used to construct linkage map with 64 polymorphic markers and it resulted into 35 markers mapped on 12 linkage groups. qtl analysis was performed by composite interval mapping (cim) using qtl cartographer2.5 software. in total, 7 qtls (osmotic potential 2, osmotic adjustment 1, seedcotton yield 1, number of bolls/plant 1, boll weight 1 and plant height 1) were identified. there were three qtls (qtlop-2, qtloa-1, and qtlph-1) detected only in water-limited conditions. two qtls (qtlsc-1 and qtlbw-1) were detected for relative values. two qtls (qtlop-1 and qtlbn-1) were detected for well-watered treatment. significant qtls detected in this study can be employed in mas for molecular breeding programs aiming at developing drought tolerant cotton cultivars.
Path Coefficient Analysis for Assessting Direct and Indirect Effects of Yield Componenets on Seed Cotton Yield in Gossypium hirsutum L.
Mohammed Jurial Baloch,Abdul Rahim Lakho,Hidayatullah Bhutto,Mohammed Yousuf Solangi
Journal of Biological Sciences , 2001,
Abstract: Yield is the outcome of many component characters, thus assessing the extent of contribution of each factor is important in designing an effective plant breeding programmes. Phenotypic correlations between bolls per plant with yield was r = 0.998, boll weight with yield was r = -0.768 and lint% with yield was r = 0.932. These results suggested that improvement in yield could be achieved by selecting cotton plant for higher bolls and more lint%. On the contrary, selection for boll weight will decrease cotton yield. These phenotypic correlations were further partitioned in to their direct and indirect effects on seed cotton yield by path coefficient analysis. This analysis revealed that bolls per plant had significant direct and indirect effects on yield, whereas boll weight and lint% had negligible effects. Multiple correlation coefficient revealed that about 91.8% of the total variation in yield is dependent on variables, bolls per plant, boll weight and lint%.
Combining Ability Estimates for Yield and Fibre Quality Traits in Line X Tester Crosses of Upland Cotton, (Gossypium hirsutum)  [cached]
kaliyaperumal Ashokkumar,R Ravikesavan,silvas jebakumar prince
International Journal of Biology , 2010, DOI: 10.5539/ijb.v2n1p179
Abstract: This study was to estimate the GCA of the parents and SCA considered for the development of high yielding and better quality cultivars. Eleven genotypes and 28 F1 hybrids obtained by crossing 4 lines and 7 testers in line X tester mating system were sown in randomized complete block design. L X T analysis revealed significant GCA and SCA effects for all the traits except earliness. Among the parents: MCU 12 for number of bolls per plant, boll weight, seed cotton yield per plant, F 1861 for seed cotton yield and number of bolls per plant, SOCC 17 for earliness, SURABHI for number of sympodia and TCH 1641 for ginning outturn and lint index with high GCA. Parent F 776 and F1861 were good combiners for fibre quality traits. The high yielding quality hybrids were deducted with significant SCA effects for seed cotton yield and fibre characteristics.
Path Coefficient and Correlation Analysis of Some Important Plant Traits of Gossypium hirsutum L.  [PDF]
Syed Sarfraz Hussain,Faqir Muhammad Azhar,Ishtiaq Mahmood
Pakistan Journal of Biological Sciences , 2000,
Abstract: The correlation studies showed that in the plant material studied, plant height, monopodial branches and No. of bolls per plant were revealed to be significantly correlated with seed cotton yield at genotypic level. The correlation between No. of bolls per plant and plant yield appeared to be strong as compared with other combinations. In addition, plant height showed positive and significant relationship with No. of sympodial branches, No. of bolls per plant and ginning %age. Path coefficient analysis revealed that No. of monopodial branches, No. of bolls per plant had maximum positive direct effect on yield of seed cotton. Therefore, it may be suggested that negative direct effects of plant height, No. of sympodial branches and ginning out turn may be considered as selection criteria to effect indirect improvement in yield of seed cotton and quality in the present breeding material.
Correlation and Path Coefficient Analysis for Earliness and Yield Traits in Cotton (G. hirsutum L.)  [PDF]
Muhammad Iqbal,Khezir Hayat,Rao Sohail Ahmad Khan,Attiq Sadiq
Asian Journal of Plant Sciences , 2006,
Abstract: The objective of this study was to get information about a character that is useful for selection in segregating generations for improving seed cotton yield. The present study was conducted to determine correlation and path coefficient analysis of earliness and yield components of upland cotton. The results showed that node of first fruiting branch, monopodial branches/ Plant, boll number and boll weight was positively and significantly correlated with yield in present genetic material understudy. Similarly path coefficient analysis revealed that node of first fruiting branch, monopodial branches/ Plant, boll number and boll weight had maximum direct positive effect on seed cotton yield, whereas the traits ginning out turn percentage (GOT%) and staple length had the direct negative effect on seed cotton yield. The results indicated that for evolving a superior genotype possessing all the three basic characteristics i.e., earliness, high yield and improved fiber quality of international standard, breeder had to use reciprocal recurrent selection method or modified back cross or three- way cross within genetic material under study. The result of present study indicated that for evolving a superior genotype possessing earliness, high yield, breeder should focus on improving no. of bolls and boll weight with lower no. of monopodial branches and node of first fruiting branch.
Transcriptome Analysis of Ten-DPA Fiber in an Upland Cotton (Gossypium hirsutum) Line with Improved Fiber Traits from Phytochrome A1 RNAi Plants  [PDF]
Qing Miao, Peng Deng, Sukumar Saha, Johnie N. Jenkins, Chuan-Yu Hsu, Ibrokhim Y. Abdurakhmonov, Zabardast T. Buriev, Alan Pepper, Din-Pow Ma
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.810172
Abstract: Silencing phytochrome A1 gene (PHYA1) by RNA interference in Upland cotton (Gossypium hirsutum L. cv. Coker 312) had generated PHYA1 RNAi lines with improved fiber quality (longer, stronger and finer fiber). To reveal molecular mechanisms that govern fiber development with positive fiber traits, a study of global gene expression profiling of 10-DPA fibers in a PHYA1 RNAi line and its parent Coker 312 was conducted by high-throughput RNA sequencing. A comparative analysis of transcriptomes between the two lines had identified 142 genes that were differentially expressed in the 10-DPA fiber of the RNAi line. Gene Ontology analysis showed that these differentially expressed genes were mainly involved in metabolic pathways, heterocyclic/organic cyclic compound binding and multiple enzyme activities, and cell structures which were reported to play important roles in fiber development. Twenty-eight KEGG pathways were mapped for the 142 genes, and the pathways related to glycolysis/gluconeogenesis and pyruvate metabolism were the most abundant and followed by cytochrome P450-involved pathways, suggesting that fiber improvement could be through the regulation of proteins involved in cytochrome P450 pathways. Genes encoding WRKY transcription factors, sucrose synthase, xyloglucan endotransglucosylase hydrolase, udp-glucuronate: xylan alpha-glucuronosyltransferase, and genes involved in lipid
Salinity Tolerance in Cotton (Gossypium hirsutum L.) Genotypes  [PDF]
Gholamhossein Hosseini,Ratnakar J. Thengane
International Journal of Botany , 2007,
Abstract: Tolerances of seven diverse genotypes of cotton (Gossypium hirsutum L.) and their 21F1 progenies were evaluated in non-saline and saline environments. Adding incremental levels of NaCl to Hogland’s solution in a sand culture electrical conductivity of 24 dS m-1 was attained inducing salinity Stress. Combined analysis based on two salinity levels revealed significant salinity-level effects for shoot dry weight, plant height, shoot fresh weight and contents of ions in shoot tissues, including sodium (Na+), potassium (K+), calcium (Ca2+), K+/Na+, Ca2+/Na+, shoot dry weight/shoot fresh weight (SDW/SFW), root length/shoot height (RL/SH). Salinity had no significant effect on root length. Estimation of Stress Intensity (SI) indicated larger values for shoot fresh weight, plant height, Ca2+/Na+, K+/Na+ (0.27, 0.31, 0.39 and 0.55, respectively). Negative and high index of SI for Na+ indicated that its mean in a saline environment was more than two times from the mean in a non-saline environment. Low estimates of negative SI index for root length, Ca2+, SDW/SFW and RL/SH indicated the effects of a saline environment for these traits were better than the other traits. Significant interactions of genotypes and salinity levels were observed for all studied traits. The result of factor analysis based on minimum eigenvalue by means of principle component analysis extraction method and rotation method of Varimax with Kaiser Normalization revealed four factors for eleven studied traits in a saline environment. Factor one and two were detected as morphological and nutritional factors, respectively. Factor three and four were detected as morphological and nutritional factors dependent on their high coefficients factor loading simultaneously. The results of factor analysis indicated that selection for morphological traits, specifically; that selection based on K+, Ca2+ and K+/Na+ should be more efficient than other traits. Cluster classification of genotypes on the basis of value of four principal for each genotype by means of principle component analysis of correlation matrix distinguished genotypes SahelxBelizovar, Siokra and SindosexKoker from other genotypes in salinity tolerance. On the basis of low estimates of the tolerance index (TOL) for shoot dry weight (its large value represents more sensitivity to stress), it was concluded that the above genotypes have had suitable salinity tolerance in early stages of growth.
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