Root growth is critical to the establishment of planted seedlings. Without sufficient root growth, seedlings can undergo stress just after planting. Stress occurs when a newly planted seedlings root system cannot supply enough water to transpiring leaf and needle to maintain a proper water and osmotic balance and ensure survival. Apart from this root growth is also necessary in proper anchorage of plants. Plant growth and development starts from the germination of seeds followed by root elongation and shoot emergence. Plants synthesize various hormones or growth regulators which are important biotic factors to regulate growth. Among the five natural plant growth regulators (Auxins, gibberellins, cytokinins, abscissic acid, ethylene) auxins are considered the most important. They are produced in the root tips as well as the shoot tips. Auxins promote root initiation (Chambers, 1999) and they also induce growth of adventitious roots i.e. branching of roots. In horticulture auxins especially naphthalene acetic acid (NAA) and indole -3-butyric acid (IBA) are commonly used to stimulate root initiation of plants. However, high concentrations of auxins can inhibit root elongation and only focus on adventitious root formation which paves the way for studying alternative methods to promote better root growth in plants.
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