Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810043716
Authors: SMBYAL, MEENAKSHI
Advisor: SRIRAM, S.
Title: GENETIC STUDIES ON VARIABILITY, CORRELATION AND PATH ANALYSIS MILK THISTLE (Silybum marianum Gaertn.)
Publisher: AAU, Anand
Language: en
Type: Thesis
Agrotags: PLANT BREEDING AND GENETICS, AGRICULTURE
A STUDY
Keywords: GENETIC STUDIES ON VARIABILITY, CORRELATION, PATH ANALYSIS, MILK THISTLE (Silybum marianum Gaertn.)
Abstract: Milk thistle (Silybum marianum) is one of the medicinally important plants of potential commercial importance. It is indigenous to Southern Europe. It grows lavishly in Western Europe, Central Europe, China and South America. In India it grows as weed in Kashmir, Punjab and other North West parts and has been found to grow well under Anand condition. Seeds of Silybum contain silymarin which is widely used in European medicine in the treatment of liver cirrhosis. It is also used to cure hepatitis and digestive disoders. In spite of its medicinal importance, Silybum is not cultivated in large acreages. Seed yield is the most economical trait, which is a manifestation of many yield-contributing characters of the plant. The present investigation was undertaken to generate information on variation, character association as well as direct and indirect effects of different characters contributing towards seed yield in Silybum marianum. The experiment was carried out in Rabi 2000-2001 at the experimental farm of Medicinal and Aromatic Plants Project, Gujarat Agricultural University, Anand Campus, Anand. The experimental material comprised of 14 genotypes of Silybum' marianum, evaluated in RBD with three replications. Data were collected on germination percentage, days to flowering, number of leaves per plant, number of heads per plant, seed yield per head, test weight, plant height, yield per plant, oil content, ß-sitosterol content, myristic acid content, total flavnolignan content, total silymarin content, silybin and dehydrosilybin (M| components) and other siiymarin compounds (M2 components) content. Analysis of means and variance revealed, significant differences among the genotypes for all the characters studied. Analysis of data on germination percent, days to flowering, number of leaves per plant, number of heads per plant, seed yield per head, plant height, yield per plant, ß-sitosterol content, myristic acid content, and other silymarin compounds (M2 components) showed predominance of genotypic variance in total variance as well as high heritability. High genetic variance coupled with high heritability provide ample scope for improvement by selection alone. The higher estimates of GCV were obtained for number of heads per plant, seed yield per head, plant height, yield per plant and other silymarin compounds (M2 components). The characters, number of heads per plant, seed yield per head, plant height, yield per plant exhibited high genetic advance coupled with high heritability, indicating that progress through selection and maintenance are possible for these traits. The estimates of correlation coefficient indicated that the seed yield can be improved by selecting for germination percent, number of leaves per plant, number of heads per plant, test weight and plant height. The matrix revealed that silymarin content had positive association with all the eight traits studied except ß-sitosterol content and seed yield per head. Path analysis based on genotypic correlations revealed that days to flowering, number of leaves per plant, number of heads per plant, seed yield per- head and plant height were the major characters exerting considerable direct effect on yield. indicating scope for considering these characters in selection. Path analysis for total silymarin and other characters showed that silymarin content is positively influenced by M1 components. M2 components, myristic acid content and yield per plant whereas it is negatively associated with oil content, ß-sitosterol content and seed yield per head. Thus, in general, selection favouring days to flowering. number of leaves per plant, number of heads per plant, plant height and other silymarin compounds (M2 components) appears feasible and useful to isolate and stabilize high yielding genotypes. The present study helped to isolate 182905 (Blackish brown), E.C.I82905 (Black), E.C.I82905 (Brown), E.C.403610 (Black) and E.C.3I4315 (Blackish brown) as better performing genotype under Anand conditions.
Subject: Genetics and Plant Breeding
Theme: GENETIC STUDIES ON VARIABILITY, CORRELATION AND PATH ANALYSIS MILK THISTLE (Silybum marianum Gaertn.)
Research Problem: GENETIC STUDIES ON VARIABILITY, CORRELATION AND PATH ANALYSIS MILK THISTLE (Silybum marianum Gaertn.)
These Type: M.Sc
Issue Date: 2003
Appears in Collections:Theses

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