EFFECT OF PRIMING ON QUALITY PARAMETERS OF ONION SEEDS AFTER ARTIFICIAL AGEING
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Date
2015
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AAU, Anand
Abstract
The present investigation entitled "Effect of priming on quality parameters of onion seeds after artificial ageing" was carried out during 2013 to 2015 at Department of Seed Science and Technology, B. A. College of Agriculture, AAU,Anand (Gujarat). Onion is an important cash crop grown in India; major onion growing states being Maharashtra, Madhya Pradesh, Karnataka, Gujarat, Bihar, Andhra Pradesh, Rajasthan, Haryana, Tamil Nadu and Odisha. In Gujarat state onion cultivation have an area of 28.85 thousand hecteires £ind production about 704.38 metric tonnes. Among all these states Gujarat is having the highest productivity of 24.4 metric tonnes per hectare. Onion seed is however classified as a poor storer, since its seed loses viability within a year under ambient storage conditions. Major factors affecting the seed quality during storage are temperature and relative humidity, which results in drastic deterioration of seed quality. Seeds of eight onion genotypes were used in present investigation. They are Bhima shubhra, Bhima kiran, Bhima raj, Bhima red, Bhima super, Bhima shweta, N-2-4-1 and Gujarat white onion-1. Six seed lots containing 100 seeds each belonging to each genotype were subjected to artificial ageing treatments for 0 (control), 3, 5 and 7 days. The artificially aged seed lots were subjected to priming treatments viz., i) GA3 @ 150 ppm ii) GA3 @ 100 ppm iii) KNO3 @ 5% and iv) KNO3 @ 3% in petriplates under room temperature and dried back to the original moisture content for further experimentation. The experiment was done first in laboratory conditions and then repeated again in nursery conditions (sowing microplots). Observations recorded in the present study in laboratory and nursery conditions were germination percentage (12th day after germination), speed of germination, shoot and root length (cm), seedling length (cm), seedling fresh weight (mg), seedling dry weight (mg), seedling vigour index-I, seedling vigour index-II and seed leachete electrical conductivity (µ si cm-1g-1). The latter was not observed in nursery conditions.
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SEED SCIENCE AND TECHNOLOGY, A STUDY