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GENETIC STUDIES IN F3 GENERATION OF FOUR CROSSES IN GROUNDNUT (Arachis hypogaea L.)

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Title GENETIC STUDIES IN F3 GENERATION OF FOUR CROSSES IN GROUNDNUT (Arachis hypogaea L.)
 
Creator SHREYA
 
Contributor VASANTHI, R.P.
 
Subject marketing, mass media, area, economic systems, sexual reproduction, fruits, wood, byproducts, selection, manpower, GENETIC STUDIES, FOUR CROSSES, GROUNDNUT, Arachis hypogaea L
 
Description The experimental material used in the study consisted of four F3 populations and five parents. The F3 populations were derived from four crosses i.e., TCGS 1043 ? ICGV 05163, TCGS 1043 ? ICGV 06045, TCGS 1043 ? ICGV 93261and TCGS 1043 ? TCGS 913. The material was grown in dry land farm of Regional Agricultural Research Station (RARS), Tirupati during kharif, 2013. The data recorded on yield and its component characters and water use efficiency characters were analyzed for variability, heritability, genetic advance as percentage of mean, character association, transgressive segregation and skewness and kurtosis.
Three crosses, TCGS 1043 ? ICGV 05163, TCGS 1043 ? ICGV 06045 and TCGS 1043 ? ICGV 93261 showed moderate to high values of genetic parameters viz., GCV, heritability and GAM for most of the characters viz., number of primary branches per plant, number of secondary branches per plant, plant height, pegs to pod ratio, total biomass per plant, shoot weight per plant, root weight per plant, shoot to root ratio, mature pods per plant, immature pods per plant, mature pod weight, kernel weight per plant and SLA reflecting that these are predominantly governed by additive genetic variance as the parents involved in these three crosses are more diverse. Based on low to moderate genetic parameters, it is inferred that SCMR is under control of non additive gene action. Selection for HI in early generation would be moderately effective as it is controlled by both additive and non-additive gene action.
From skewness and kurtosis studies in F3 populations, it is clear that the character SCMR is a quantitative trait and under control of both additive and non additive gene actions as it showed negative skewness in two crosses,
Name of the Author : SHREYA Title of the Thesis : GENETIC STUDIES IN F3 GENERATION OF FOUR CROSSES IN GROUNDNUT (Arachis hypogaea L.) Degree to which Thesis is submitted : MASTER OF SCIENCE IN AGRICULTURE
Faculty : AGRICULTURE
Major field : GENETICS AND PLANT BREEDING
Chairperson : Dr. R. P. VASANTHI
University : ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY Year of submission : 2014
TCGS 1043 ? ICGV 05163 and TCGS 1043 ? ICGV 06045 and near- normal distribution in the other two crosses. F3 distribution indicated that total biomass, shoot weight and root weight are quantitative traits and governed by additive and non-additive variance and positive skewness could be due to favourable allelic interactions i. e., dominance and epistasis of both the parents involved. For shelling out-turn F3 distributions were highly negatively skewed indicating non-allelic interactions. For SLA in most of the crosses positive skewness was observed while for HI it was near-normal distribution indicating the quantitative nature and presence of additive variance for HI.
From the estimates of genetic parameters and F3 distribution studies, it can be inferred that the characters, number of primary branches per plant number of secondary branches per plant, number of pegs per plant, pegs to pod ratio, total biomass, shoot weight per plant, root weight per plant, shoot to root ratio, mature and immature pods per plant, mature pod weight and kernel weight per plant are governed predominantly by additive genetic variances and SCMR, SLA, HI and shelling out-turn are influenced by both additive and non-additive genetic variance.
Transgressive individuals with values exceeding the better parent were observed in all the crosses for SCMR, SLA, total biomass, harvest index, shoot weight, root weight, shelling out-turn, mature pod weight and kernel weight per plant. This indicates that the parents possess different alleles and genes governing respective characters indicating the scope to bring in beneficial alleles into a single genotype through rigorous selection and evaluation of the segregants for different characters along with selection for yield to arrive at a desirable plant type through selection in later generations.
Mature pod weight per plant showed significant positive association with primary branches per plant, pegs per plant, total biomass, shoot weight, root weight, mature pods per plant, immature pods per plant, HI and kernel weight per plant in all the crosses indicating these should be considered while selecting for yield. Mature pod weight per plant showed significant positive association with shelling out-turn in three crosses except TCGS 1043 ? TCGS 913. Non-significant correlation of secondary branches per plant with mature pod weight per plant in three crosses indicates that it need not to be considered while selecting for yield. A significant negative correlation of SLA in three out of four crosses indicates the possibility of getting high yielding lines with low SLA. Non - significant correlation of SCMR with yield clearly shows that SCMR, a correlated trait to WUE can be manipulated along with yield.
 
Date 2016-11-14T13:44:04Z
2016-11-14T13:44:04Z
2014
 
Type Thesis
 
Identifier 156p.
http://krishikosh.egranth.ac.in/handle/1/85421
 
Language en_US
 
Relation D5031;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY