Author: Patil R C.Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Genetic Analysis of Yield and Its Components in Sorghum (Sorghum Bicolor L. Moench) I-Heterosis, Combining Ability and the Nature of Genetic Variation in 9x9 Diallel Set II- Heterosis, Combining Ability and Components of Generation Means in A4x5 (Line X Tester) Set
Author: Patil R C.Genetics of Yield Heterosis in Sorghum(Sorghum Bicolor L.Moench)
Author: Jhansi RaniPublisher: LAP Lambert Academic Publishing
ISBN: 9783659437717
Category :
Languages : en
Pages : 268
Book Description
Post rainy sorghum is unique to India, which is mostly grown on residual soil moisture in southern states, subjected to various biotic and abiotic stresses. Keeping in view the low heterosis in post rainy hybrids compared to rainy season hybrids, the study was taken up with 41 genotypes to enumerate the approaches for enhancing the level of heterosis. There was a positive relationship between heterosis for grain yield and major yield components. Genetic diversity analysis showed importance of inter as well as intra group divergence in expression of heterosis. There was a general positive trend between hybrid yield and sca effect but at least one general combiner was involved in highest yielding crosses and there was positive relationship between heterosis and mean gca of parents. Major yield components were controlled by non additive gene effects hence it is proposed to breed parental lines with high gca effect with capability to produce high sca effect in hybrid combination to enhance the level of heterosis and productivity. The information in this book is useful for sorghum breeders and geneticists for formulating effective crop improvement programme.
Genetic Diversity and Combining Ability Among Sorghum Conversion Lines
Author: Rafael Arturo Mateo MoncadaPublisher:
ISBN: 9781109849813
Category :
Languages : en
Pages : 120
Book Description
The use of AFLP markers allowed the identification of five strong clusters through estimates of genetic similarities. This classification did not group the lines by either their genetic background or their fertility reaction. This study provides information to identify specific combinations that would help to understand heterotic relationships in sorghum, and support the suggestions made by Menz and Gabriel that races in sorghum are not well defined.
Combining Ability and Heterosis Studies for Adaptation in Newly Developed Male and Female Inbreds of Sorghum, Sorghum Bicolor (L.) Moench
Author: German Jose PerezPublisher:
ISBN:
Category : Hybrid sorghum
Languages : en
Pages : 446
Book Description
Genetic Analysis of Yield and Yield Components to Enhance the Level of Heterosis in Sorghum (Sorghum Bieolor (L.) Moench
Author: K. Jhansi RaniCombining Ability and Heterosis for Yield, Protein, Lysine and Certain Plant Characters in 18 Diverse Inbreds and 56 Hybrids in Sorghum Bicolor (L.) Moench
Author: Ayotunku Olabanji AbifarinPublisher:
ISBN:
Category :
Languages : en
Pages : 178
Book Description
Genetic and Combining Ability Analysis of Some Agronomic and Grain Quality Characters in Sorghum
Author: J.G.E.de FRANCAPublisher:
ISBN:
Category :
Languages : en
Pages : 105
Book Description
The objective of this study was to evaluate the combining ability, heterosis and variance components of a set of selected restorers and male sterile in sorghum for the following characters: days to 50% flowering, plant height, panicle length, grain yield per panicle, number of grains per panicle, thousand grain weight, grain breaking strength, % floaters, % water absorption, flour particle size index, rolling quality of the dough and gel spreading. Twenty parental lines - 11 male steriles and 9 restorers and their 99 hybrids formed the experimental material. parents and hybrids were palnted in adjancent trials in a RBD design with threee replications each. The combining ability analysis followed a line x tester mating system. The experiments were carried out under rainfed conditions during the rainy (kharif) and post-rainy (Rabi) seasons of 1982 at ICRISAT Center, patancheru, A.P., India. Significant variation was observed in the genotypes studied for most of the charactrs analysed. Generally the restorers showed larger variation than the male sterile lines. Significant levels of heterosis and heterobeltiosis were observed for plant height, grain yield per panicle, grain number per panicle and % floaters. Dominace was in the direction of earliness, increased height, panicle length, grain number and yield, decreased seed weight, % floaters, flour particle size and gel spreading. The results revealed that most of the agronomic and grain quality characters were highly influenced by additive gene action. (...).
Agronomic, Genetic and Genomic Approaches for Predicting Heterosis in Sorghum [Sorghum Bicolor (L.) Moench]
![Agronomic, Genetic and Genomic Approaches for Predicting Heterosis in Sorghum [Sorghum Bicolor (L.) Moench] PDF](https://books.google.com/books/content/images/frontcover/maODAQAACAAJ?fife=w80-h100)
Author: Frank MaulanaPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The approach used to identify inbred lines that can produce superior hybrids is costly and time-consuming. It requires creation of all possible crosses and evaluation of the crosses to estimate combining abilities for the desired traits. Predicting heterosis or hybrid performance in any way possible may help to reduce the number of crosses to be made and evaluated. In this study, four sets of experiments were conducted to determine whether heterosis can be predicted based on inbred line performance, genetic distance between parents and genomic prediction model. The first experiment was aimed at assessing the levels of genetic diversity, population structure and linkage disequilibrium (LD) in 279 public sorghum inbred lines, based on 66,265 SNPs generated using the genotyping-by-sequencing (GBS) platform. The inbred lines were developed at different times over the last two decades and harbor robust diversity in pedigree and agronomic characteristics. Some of the inbreds are resistant to Acetolactate synthase (ALS) and Acetyl co-enzyme-A carboxylase (ACC) inhibitor herbicides. The mean polymorphic information content (PIC) and gene diversity across the entire inbreds were 0.35 and 0.46, respectively with non-herbicide resistant inbreds harboring more diversity than the herbicide resistant ones. The population structure analysis clustered the inbred lines into three major subgroups according to pedigree and fertility-reaction with the maintainer lines (B-lines) distinctly forming a separate cluster. Analysis of molecular variance (AMOVA) revealed more variation within subgroups than among subgroups. Substantial linkage disequilibrium (LD) was detected between the markers in the population with marked variation between chromosomes. This information may facilitate the use of the inbreds in sorghum breeding programs and provide perspectives for optimizing marker density for gene mapping and marker-assisted breeding. The second experiment, based on 102 F1 hybrids developed by intercrossing closely and distantly related inbreds, was conducted to investigate the relationship of genetic distance between parents with hybrid vigor or heterosis. The F1 hybrids alongside their parents were evaluated at two environments in a randomized complete block design with three replications. The results show that correlations of genetic distance between parents with hybrid performance and heterosis were variable and dependent on the trait. Though most were statistically non-significant and not strong to be used as predictor for heterosis, the results tend to show that certain level of genetic distance between parents is needed to capture maximum heterosis and hybrid performance. The objective of the third research study was to determine whether traits measured on parents can be used to predict hybrid performance in sorghum and to assess the combining ability of selected inbreds. Forty-six parental inbred lines and 75 F1 hybrids generated from intercrossing the inbreds were evaluated in four environments in a randomized complete block design with three replications. The average performance of the parents (mid-parent) was significantly correlated with hybrid performance for thousand kernel weight, days to flowering and plant height. Significant general (GCA) and specific (SCA) combining abilities were observed for most traits, with highly significant GCA effects observed for most traits as compared to SCA indicating that additive genetic effects are more important in affecting the inheritance of the traits measured. Results show that studying parental inbred line performance could generate important information for predicting hybrid performance in sorghum. The fourth experiment was aimed at assessing the efficacy of genomic prediction of hybrid performance in sorghum. Genomic prediction was performed with five-fold cross-validation procedure on 204 F1 hybrids developed using 102 inbred lines. A total of 66,265 SNP markers generated using genotyping-by-sequencing were used in this study. Results showed that increasing training population size increased prediction accuracies for all traits with the effect being different for different traits. Also, considering additive effects alone versus additive and dominance effects in the model showed similar trend of prediction accuracy but the full model (considering both additive and dominance effects of the markers) provided better prediction at least for some of the traits. The results suggest that genomic prediction could become an effective tool for predicting the performance of untested sorghum hybrids thus adding efficiency to hybrid selection.
Author: Sidramappa Talekar
Author: Jadhav A S.