Which plant hormone helps in breaking the dormancy of plant?
What is Dormancy?
Dormancy is a completely natural cycle that some seeds and bulbs go through. As a plant prepares for winter, it carefully stores away food and water in a seed or bulb. This food and water will help it grow again when the right conditions return the following spring – whether after a week, a month, or several months! A dormancy period can be broken by various things that happen in an environment. A good example of this is provided by the way that deciduous trees lose their leaves during winter – they entering a state of dormancy.
Dormancy of Plant
Dormancy is a state in which energy and metabolic requirements of the plant are very low and growth and development stop. Plant dormancy can be induced by environmental or genetic factors, but the basic underlying physiological mechanisms are conserved among species. This review focuses on recent progress in understanding the molecular basis of dormancy in plants, especially in seeds.
Breaking the Dormancy of Plant
The seed dormancy phenomenon is encountered in many economically important plant species and often limits the successful establishment of crops. We propose that during dormancy, the status of the embryo and interaction between the embryo and seed coat regulates germination. Breaking dormancy involves a change in the embryo’s tissue water content, pH, and/or osmotic potential, which may be associated with changes in cell membrane permeability. The breaking can be readily detected according to changes in plasma membrane structure and/or conductance measured by impedance spectroscopy.
What are Auxins?
Auxins are plant hormones that regulate growth. Auxins also play a role in cell division and differentiation, in fruit development, in the formation of roots from cuttings, in the inhibition of lateral branching (apical dominance), and in leaf fall (abscission). Auxins are abundantly produced in meristematic region of the shoot. Auxins were discovered by botanist Fritz W. Went.
What are the functions of Auxins?
Auxin is a plant hormone that helps control the growth of plants. Auxin promotes cell growth and elongation of the plant. In the elongation process, auxin alters the plant wall plasticity making it easier for the plant to grow upwards. Auxins are responsible for rooting formations.
What are Gibberellins?
Gibberellins are plant hormones that regulate various developmental processes, including stem elongation, germination, dormancy, flowering, flower development, and leaf and fruit senescence. GAs are one of the longest-known classes of plant hormone.
What are the functions of Gibberellins?
Gibberellins are the most important plant growth regulators. These hormones function by increasing the rate of various developmental processes, hence they are called “Growth promoting substances”. Gibberellins act by stimulating cell elongation of different plant organs, especially stems. They also cause broadening of epidermal cells (leaf cells). Gibberellins enhance the development of fruit and induce the formation of seeds.
What are Cytokinins?
Cytokinins are naturally occurring plant growth regulators, eliciting responses necessary for normal growth and development. Cytokinins are involved in cell division, leaf senescence, apical dominance, shoot initiation and growth, phyllotaxis, vascular, gametophyte and embryonic development. They also mediate the response to biotic and abiotic factors such as light intensity and mechanical stress.
What is the function of cytokinin?
The function of cytokinin in plants is to control the division of cells. This hormone helps in increasing the cell’s growth, development, differentiation, affecting apical dominance, leaf senescence, and axillary bud growth. Cytokinins also promote seed germination and root cell division. The addition of cytokinin in plant’s leaves increase transpiration which increases water loss. It is popularly known as plant growth stimulating hormone.
What is an example of cytokinin?
The most abundant cytokinin in Arabidopsis is trans-zeatin. Kinetin is an artificial, aromatic cytokinin and benzyladenine is an example of a naturally occurring aromatic cytokinin. Thidiazuron is a diphenylurea-type cytokinin.
What is Ethylene?
Ethylene is a natural plant hormone that basically stimulates the growth and senescence. Ethylene is a colorless flammable gas with a faint “sweet and musky” odor when pure. Ethylene is the simplest alkene. Ethylene is widely used in the chemical industry, and its worldwide production exceeds that of any other organic compound.
What is the function of Ethylene?
Ethylene is a hormone that promotes growth and senescence processes depending on its concentration, timing of application, and the plant species.