Auxins play an important role in stem initiation and
elongation which involves in different features of
growth and developments in higher plants. The auxins 2, 4-D are strong promoters of callus induction and growth
of cell suspensions. There are only a few examples of
the shoot and root induction by phenoxy auxins in tree
tissue cultures (Zaerr and Mapes, 1982). For shoot
induction generally requires the combination of auxin
and cytokinin. However, auxin should be used carefully
since too much auxin favors callus growth. Moreover, for shoot initiation in some explants, the production of
endogenous auxin is sufficient for induction of shoots in
larix decidue (Bondga and Von-Aderkas, 1992). The
number of shoots induced on MS medium (Murashige
and Skoog, 1962). The auxin signal is predictable by
plant cells and rapidly converted to a wide variety of
responses in the growth and development of plant
organs. These comprise alters in the direction of growth,
shoot and root branching, and vascular differentiation
(Leyser, 2001).
The plant cell division and growth of tissue, cells
cultured in vitro require an external source of auxin
(Petrasek et al., 2002). The proportion of external to
Showing posts with label Auxins. Show all posts
Showing posts with label Auxins. Show all posts
Use of Plant Auxins Produced by Bacteria in Plant Tissue Culture and Seed Pre-treatment; A Possibility of Replacement of Synthetic Auxins
Phyto-hormones or plant growth regulators
are organic substances synthesized in
defined organs of the plant that can be
translocated to the other sites, where it
triggers specific biochemical, physiological
and morphological responses (Vamil, 2011).
Today, the synthetic plant growth regulators
are available commercially. If these
chemicals are applied in specific quantity,
enhance the plant growth (Naeem, 2004).
There are five different types of plant
growth promoting substances produced in
plants. Out of this IAA, IBA are important
as having major growth promoting activity.
Many investigations showed that presowing
treatment of growth regulators to the
seeds could lead to increase in tissue
hydration, redistribution of nutrient reserves,
higher respiratory activities and
enhancement of seedling growth, dry matter
production, early flowering and yield.
(Vamil, 2011). IAA exerts influence on
plant growth by enlarging leaves and
increasing photosynthetic activities in plants
(Naeem, 2004). IAA also activates the
translocation of carbohydrates during their
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