ASSESSMENT OF THE CAUSES FOR POOR SEED GERMINATION IN Melia dubia AND EFFORTS TO OVERCOME
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Date
2013-08-10
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Abstract
Melia dubia Cav. is a species of high medicinal and industrial value, commonly referred to as Malabar Neem Tree. Recently it is gaining more popularity in southern states of India for its fast growth and wide adaptability in diverse edaphic and climatic conditions. Hence demand for nursery grown seedlings has increased immensely. There is a need to produce healthy and vigorous seedlings in short duration, by enhancing seed germination through appropriate pre-sowing seed treatments. To achieve this, information on seed biology, viability, and fruit morphological characters, are very essential. With this point in view the present study was carried out in Department of Forestry and Environmental Sciences, UAS, G.K.V.K., Bangalore.
In the present study the selected natural population of Melia dubia that starts flowering in the month of January, and sets fruit in the month of April and mature during January in succeeding year. Number of locules and seeds found in large fruits was found to be more compared to small and medium fruits. Seeds from large fruits showed higher viability compared to medium and small seeds. The viability of seed was found to vary with stages of fruit maturity.
Among various treatments, seeds treated with GA 100 ppm, showed maximum germination of 30.0 %, followed by 16.6 % in GA 200 ppm, and GA 2000 ppm treatments respectively, while other treatments show little response. Under complete aseptic conditions seeds showed highest germination of 61%. So high rate of germination seen under controlled conditions clearly indicate the role of light, temperature and nutrients on germination apart from hormones and morphometric characters.
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cotton, productivity, costs, area, tillage equipment, marketing, economics, crops, biological development, manpower