tailieunhanh - Physiological studies of ornamental bulb dormancy

Dormancy in bulbs describes a complex phenomenon involving temporal cessation of growth in metabolically active plant parts until the conditions become favourable. The entire physiology of metabolic arrest with its induction and termination is under hormonal, molecular and environmental control. At present, the molecular regulation of dormancy is still remains unclear and least understood. Indian floriculture industry totally depends on import of flower bulbs every year due to the development of deep dormancy in bulbs. Dormant bulb requires an ample of cold treatment period to release its dormancy. Moreover, dormancy limits the production immediately after harvest and importing of bulbs from the other countries increases the chances of entry of exotic pests and diseases which challenges our farmer‟s economy. To overcome this problem, necessary treatments are required to practice for easy sprouting by modulating the biosynthetic pathway of inhibitory substances. | 2019 8 4 2305-2314 EXCELLENT PUBLISHERS International Journal of Current Microbiology and Applied Sciences ISSN 2319-7706 Volume 8 Number 04 2019 Journal homepage http Review Article https Physiological Studies of Ornamental Bulb Dormancy Soudamini Karjee and Sourav Mahapatra Indian Institute of Horticultural Research Bengaluru-560089 India Corresponding author ABSTRACT Keywords Bulb dormancy Environmental influence Hormonal regulation Physiological changes and Sprouting Article Info Accepted 17 March 2019 Available Online 10 April 2019 Dormancy in bulbs describes a complex phenomenon involving temporal cessation of growth in metabolically active plant parts until the conditions become favourable. The entire physiology of metabolic arrest with its induction and termination is under hormonal molecular and environmental control. At present the molecular regulation of dormancy is still remains unclear and least understood. Indian floriculture industry totally depends on import of flower bulbs every year due to the development of deep dormancy in bulbs. Dormant bulb requires an ample of cold treatment period to release its dormancy. Moreover dormancy limits the production immediately after harvest and importing of bulbs from the other countries increases the chances of entry of exotic pests and diseases which challenges our farmer s economy. To overcome this problem necessary treatments are required to practice for easy sprouting by modulating the biosynthetic pathway of inhibitory substances. Introduction Dormancy is a complex and dynamic morphological physiological and biochemical mechanism in which there are no visible external changes or growth and there is a temporary suspension of apparent growth of any plant part having a meristem Lang et al. 1987 .Studies pertaining to bulb dormancy have been conducted by several authors Wareing and Saunders 1971 Kamerbeek et al. 1972 Rudnicki 1974

• Nông nghiệp
• Bulb dormancy
• Environmental influence
• Hormonal regulation
• Physiological changes and sprouting
• Ornamental bulb dormancy