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Subject: Seed Science and Technology × Author: Joshi, Vipin Chandra × End date: 2016 × Start date: 2011 ×
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    ThesisItemOpen Access
    Genetic divergence, character association and seed vigour testing in jatropha (Jatropha curcas L.)
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2014-08) Joshi, Vipin Chandra; Nautiyal, M.K.
    The present study was initiated in the year 2005 under the project National Network on Integrated Development of Jatropha and the present study carried out during the year 2011-14. The genotypes were planted in Randomized block design (RBD) with three replication at Medicinal Plant Research and Development centre (MRDC) of G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India. the observations were recorded on seed yield plant-1 (kg), seed yield hactare-1(kg), plant height (cm), collar diameter (cm), days to flower initiation, total number of branches plant-1, seed index (g), to study the genetic divergence among the different Jatropha genotypes. among them five superior genotypes are studied for seed vigour testing in same year side by side under lab and field conditions by applying different days of accelerated ageing treatments, the experiment was laid out in factorial CRD with three replication. After accelerated ageing the seed quality parameters of Jatropha genotypes under lab conditions were recorded. The seed aged from different treatments of each variety were subjected to field experiment for evaluating plant growth, seed yield and its contributing characters. The analysis of variance revealed that there was significant differences among all the forty six genotypes for all the characters except seed index in 2011-12, thee pooled data over two years showed highly significant differences in treatment x years and treatments for all the traits. IGAU- Raipur showed maximum seed yield hactare-1, & seed yield plant-1, collar diameter & seed index followed by IGAU- Bilaspur. A close study of PCV, GCV & ECV indicated high amount of variability for seed yield plant-1, seed yield hactare-1, & days to flower initiation where as collar diameter, total number of branches plant-1, and seed index showed moderate amount of variability high heritability accounted for seed yield plant-1, seed yield hactare-1(kg), collar diameter (cm), days to flower initiation, total number of branches plant-1, indicating less contribution of environment. Moderate heritability estimates was found for plant height as well as phenotypic correlation with seed yield hectare-1, collar diameter, number of branches plant-1. D2 analysis of the pooled data over two years represents all the forty six genotypes are grouped in eight clusters. Out of eight clusters highest no of genotypes are found in cluster-II. The maximum intra cluster distance (57.86), was exhibited by cluster-II indicating scope of selection. The maximum inter cluster distance (318.54) between cluster I & VIII, indicating wide genetic diversity between the genotypes. In seed vigour testing under laboratory conditions every treatment had significant negative influence over un aged control in all the parameters. Out of five ageing treatments 144h, ageing period showed greater effect of ageing followed by 120, 96, 72,48h, ageing respectively. The genotype IGAU- Raipur had more capable to maintain seed vigour after all ageing and considered vigorous and good storer under ambient conditions. Whereas Pant-J03103, TNMC-3, demonstrate as poor vigour and storability. In field experiment the results correlated with laboratory experiments.