Hormones in plants

1
Hormones in plants Plants also use hormones and
most of these work in a similar way to hormones
in animals, transported in the xylem and
phloem There are five groups of hormones found
in plants. These are 1. Auxins involved in
cell elongation, impacts on lateral branch and
root growth, differentiation of unspecified
cells, involved in a plant bending toward
light 2. Cytokinins promotes growth in shoots,
fruits and roots. Promotes cell reproduction 3.
Gibberellins -stimulate cell elongation and
reproduction. Initiates seed germination and bud
development
2
Hormones in plants Plants also use hormones and
most of these work in a similar way to hormones
in animals, transported in the xylem and
phloem There are five groups of hormones found
in plants. These are 1. Auxins involved in
cell elongation, impacts on lateral branch and
root growth, differentiation of unspecified
cells, involved in a plant bending toward
light 2. Cytokinins promotes growth in shoots,
fruits and roots. Promotes cell reproduction 3.
Gibberellins -stimulate cell elongation and
reproduction. Initiates seed germination and bud
development
3
Hormones in plants Plants also use hormones and
most of these work in a similar way to hormones
in animals, transported in the xylem and
phloem There are five groups of hormones found
in plants. These are 1. Auxins involved in
cell elongation, impacts on lateral branch and
root growth, differentiation of unspecified
cells, involved in a plant bending toward
light 2. Cytokinins promotes growth in shoots,
fruits and roots. Promotes cell reproduction 3.
Gibberellins -stimulate cell elongation and
reproduction. Initiates seed germination and bud
development
4
Hormones in plants Plants also use hormones and
most of these work in a similar way to hormones
in animals, transported in the xylem and
phloem There are five groups of hormones found
in plants. but I will tell you about a potential
6th These are 1. Auxins involved in cell
elongation, impacts on lateral branch and root
growth, differentiation of unspecified cells,
involved in a plant bending toward light 2.
Cytokinins promotes growth in shoots, fruits and
roots. Promotes cell reproduction 3.
Gibberellins -stimulate cell elongation and
reproduction. Initiates seed germination and bud
development
5
Hormones in plants Plants also use hormones and
most of these work in a similar way to hormones
in animals, transported in the xylem and
phloem There are five groups of hormones found
in plants. These are 1. Auxins involved in
cell elongation, impacts on lateral branch and
root growth, differentiation of unspecified
cells, involved in a plant bending toward
light 2. Cytokinins promotes growth in shoots,
fruits and roots. Promotes cell reproduction 3.
Gibberellins -stimulate cell elongation and
reproduction. Initiates seed germination and bud
development
6
Hormones in plants Plants also use hormones and
most of these work in a similar way to hormones
in animals, transported in the xylem and
phloem There are five groups of hormones found
in plants. These are 1. Auxins involved in
cell elongation, impacts on lateral branch
development and root growth, differentiation of
unspecified cells, involved in a plant bending
toward light 2. Cytokinins promotes growth in
shoots, fruits and roots. Promotes cell
reproduction 3. Gibberellins -stimulate cell
elongation and reproduction. Initiates seed
germination and bud development
7
Hormones in plants Plants also use hormones and
most of these work in a similar way to hormones
in animals, transported in the xylem and
phloem There are five groups of hormones found
in plants. These are 1. Auxins involved in
cell elongation, impacts on lateral branch and
root growth, differentiation of unspecified
cells, involved in a plant bending toward
light 2. Cytokinins promotes growth in shoots,
fruits and roots, promotes cell reproduction 3.
Gibberellins -stimulate cell elongation and
reproduction. Initiates seed germination and bud
development
8
Hormones in plants Plants also use hormones and
most of these work in a similar way to hormones
in animals, transported in the xylem and
phloem There are five groups of hormones found
in plants. These are 1. Auxins involved in
cell elongation, impacts on lateral branch and
root growth, differentiation of unspecified
cells, involved in a plant bending toward
light 2. Cytokinins promotes growth in shoots,
fruits and roots, promotes cell reproduction 3.
Gibberellins stimulate cell elongation and
reproduction, initiates seed germination and bud
development
9
Hormones in plants 4. Abscisic Acid inhibits
growth, involved in leaf / fruit abscission,
also involved in stomatal closure 5.
Ethylene involved in the ripening of fruit 6.
Florigen ? if it exists it may be involved in
flowering
10
Hormones in plants 4. Abscisic Acid inhibits
growth, involved in leaf / fruit abscission,
also involved in stomatal closure 5.
Ethylene involved in the ripening of fruit 6.
Florigen ? if it exists it may be involved in
flowering
11
Hormones in plants 4. Abscisic Acid inhibits
growth, involved in leaf / fruit abscission,
also involved in stomatal closure 5.
Ethylene involved in the ripening of fruit 6.
Florigen ? if it exists it may be involved in
flowering
12
Plant hormones often work in conjunction with
other hormones and the effect of these hormones
often depends on concentration and
combination These hormones are mainly produced
in growing shoots and roots, fruits, young leaves
and germinating seeds External factors, such as
day length, impact upon plant development and can
influence or control hormone production Very
small amounts of hormones are produced in plant
cells and these are effective in very low
concentrations
13
Plant hormones often work in conjunction with
other hormones and the effect of these hormones
often depends on concentration and
combination These hormones are mainly produced
in growing shoots and roots, fruits, young leaves
and germinating seeds External factors, such as
day length, impact upon plant development and can
influence or control hormone production Very
small amounts of hormones are produced in plant
cells and these are effective in very low
concentrations
14
Plant hormones often work in conjunction with
other hormones and the effect of these hormones
often depends on concentration and
combination These hormones are mainly produced
in growing shoots and roots, fruits, young leaves
and germinating seeds External factors, such as
day length, impact upon plant development and can
influence or control hormone production Very
small amounts of hormones are produced in plant
cells and these are effective in very low
concentrations
15
Plant hormones often work in conjunction with
other hormones and the effect of these hormones
often depends on concentration and
combination These hormones are mainly produced
in growing shoots and roots, fruits, young leaves
and germinating seeds External factors, such as
day length, impact upon plant development and can
influence or control hormone production Very
small amounts of hormones are produced in plant
cells and these are effective in very low
concentrations
16
Auxins Auxins are a group of many hormones
primarily involved in cell elongation and
enlargement in the stems Auxins stimulate
lateral and adventitious root growth, however, in
high concentrations auxins retard root
growth Auxins also promote growth of flowers and
fruit and influence cell differentiation Indoleac
etic Acid (IAA) is an important hormone in this
group IAA is responsible for apical dominance.
Apical dominance causes the Xmas tree look of
many trees, as IAA, which is produced in the
growing tips, inhibits lateral branch
growth Gardeners often cut the growing tips of
plants to encourage them to become bushy. This
removes the source of IAA and lateral branch
growth is no longer inhibited
17
Auxins Auxins are a group of many hormones
primarily involved in cell elongation and
enlargement in the stems Auxins stimulate
lateral and adventitious root growth, however, in
high concentrations auxins retard root
growth Auxins also promote growth of flowers and
fruit and influence cell differentiation Indoleac
etic Acid (IAA) is an important hormone in this
group IAA is responsible for apical dominance.
Apical dominance causes the Xmas tree look of
many trees, as IAA, which is produced in the
growing tips, inhibits lateral branch
growth Gardeners often cut the growing tips of
plants to encourage them to become bushy. This
removes the source of IAA and lateral branch
growth is no longer inhibited
18
Auxins Auxins are a group of many hormones
primarily involved in cell elongation and
enlargement in the stems Auxins stimulate
lateral and adventitious root growth, however, in
high concentrations auxins retard root
growth Auxins also promote growth of flowers and
fruit and influence cell differentiation Indoleac
etic Acid (IAA) is an important hormone in this
group IAA is responsible for apical dominance.
Apical dominance causes the Xmas tree look of
many trees, as IAA, which is produced in the
growing tips, inhibits lateral branch
growth Gardeners often cut the growing tips of
plants to encourage them to become bushy. This
removes the source of IAA and lateral branch
growth is no longer inhibited
19
Auxins Auxins are a group of many hormones
primarily involved in cell elongation and
enlargement in the stems Auxins stimulate
lateral and adventitious root growth, however, in
high concentrations auxins retard root
growth Auxins also promote growth of flowers and
fruit and influence cell differentiation Indoleac
etic Acid (IAA) is an important hormone in this
group IAA is responsible for apical dominance.
Apical dominance causes the Xmas tree look of
many trees, as IAA, which is produced in the
growing tips, inhibits lateral branch
growth Gardeners often cut the growing tips of
plants to encourage them to become bushy. This
removes the source of IAA and lateral branch
growth is no longer inhibited
20
Auxins Auxins are a group of many hormones
primarily involved in cell elongation and
enlargement in the stems Auxins stimulate
lateral and adventitious root growth, however, in
high concentrations auxins retard root
growth Auxins also promote growth of flowers and
fruit and influence cell differentiation Indoleac
etic Acid (IAA) is an important hormone in this
group IAA is responsible for apical dominance.
Apical dominance causes the Xmas tree look of
many trees, as IAA, which is produced in the
growing tips, inhibits lateral branch
growth Gardeners often cut the growing tips of
plants to encourage them to become bushy. This
removes the source of IAA and lateral branch
growth is no longer inhibited
21
Auxins Auxins are a group of many hormones
primarily involved in cell elongation and
enlargement in the stems Auxins stimulate
lateral and adventitious root growth, however, in
high concentrations auxins retard root
growth Auxins also promote growth of flowers and
fruit and influence cell differentiation Indoleac
etic Acid (IAA) is an important hormone in this
group IAA is responsible for apical dominance.
Apical dominance causes the Xmas tree look of
many trees, as IAA, which is produced in the
growing tips, inhibits lateral branch
growth Gardeners often cut the growing tips of
plants to encourage them to become bushy. This
removes the source of IAA and lateral branch
growth is no longer inhibited
22
Auxins Auxins are a group of many hormones
primarily involved in cell elongation and
enlargement in the stems Auxins stimulate
lateral and adventitious root growth, however, in
high concentrations auxins retard root
growth Auxins also promote growth of flowers and
fruit and influence cell differentiation Indoleac
etic Acid (IAA) is an important hormone in this
group IAA is responsible for apical dominance.
Apical dominance causes the Xmas tree look of
many trees, as IAA, which is produced in the
growing tips, inhibits lateral branch
growth Gardeners often cut the growing tips of
plants to encourage them to become bushy. This
removes the source of IAA and lateral branch
growth is no longer inhibited
23
Auxins Auxins are involved in a plant bending
toward light. This is called phototropism The
auxins in a growing shoot move away from the
light, to the shaded side. On the shaded side the
auxins stimulate cell elongation. As these cells
increase in length the shoot bends toward the
light DIAGRAM OF PHOTOTROPISM
24
Auxins Auxins are involved in a plant bending
toward light. This is called phototropism The
auxins in a growing shoot move away from the
light, to the shaded side. On the shaded side the
auxins stimulate cell elongation. As these cells
increase in length the shoot bends toward the
light DIAGRAM OF PHOTOTROPISM
25
Auxins Geotropism is the bending of a shoot
vertically A germinating seed may be oriented in
a way that causes the growing shoot to emerge
horizontally. Auxin moves to the underside of
the shoot, influenced by gravity. There the
cells elongate and the shoot bends
vertically DIAGRAM OF GEOTROPISM
26
Auxins Geotropism is the bending of a shoot
vertically A germinating seed may be oriented in
a way that causes the growing shoot to emerge
horizontally. Auxin moves to the underside of
the shoot, influenced by gravity. There the
cells elongate and the shoot bends
vertically DIAGRAM OF GEOTROPISM
27
Cytokinins These are a group of growth promoting
hormones. Cytokinins promote cell
reproduction. Found in high concentration in
areas undergoing rapid growth, such as growing
tips and developing fruits
28
Cytokinins These are a group of growth promoting
hormones. Cytokinins promote cell
reproduction. Found in high concentration in
areas undergoing rapid growth, such as growing
tips and developing fruits
29
Cytokinins These are a group of growth promoting
hormones. Cytokinins promote cell
reproduction. Found in high concentration in
areas undergoing rapid growth, such as growing
tips and developing fruits
30
Gibberellins Gibberellins promote plant growth
by stimulating cells to elongate and reproduce
(divide), particularly in young branches Also
important in bud development Initial seed
germination involves stored gibberellin becoming
activated by the presence of water. This is the
catalyst for a series of reactions resulting in
the seed germinating
31
Gibberellins Gibberellins promote plant growth
by stimulating cells to elongate and reproduce
(divide), particularly in young branches Also
important in bud development Initial seed
germination involves stored gibberellin becoming
activated by the presence of water. This is the
catalyst for a series of reactions resulting in
the seed germinating
32
Gibberellins Gibberellins promote plant growth
by stimulating cells to elongate and reproduce
(divide), particularly in young branches Also
important in bud development Initial seed
germination involves stored gibberellin becoming
activated by the presence of water. This is the
catalyst for a series of reactions resulting in
the seed germinating
33
Gibberellins Gibberellins promote plant growth
by stimulating cells to elongate and reproduce
(divide), particularly in young branches Also
important in bud development Initial seed
germination involves stored gibberellin becoming
activated by the presence of water. This is the
catalyst for a series of reactions resulting in
the seed germinating
34
Abscisic Acid Abscisic acid is involved in the
process of leaves and fruits falling from a
plant (abscission) Inhibits seed germination and
encourages dormancy Stimulates stomal closure if
plants begin to wilt DIAGRAM OF LEAF
ABSCISSION
35
Abscisic Acid Abscisic acid is involved in the
process of leaves and fruits falling from a
plant (abscission) Inhibits seed germination and
encourages dormancy Stimulates stomal closure if
plants begin to wilt DIAGRAM OF LEAF
ABSCISSION
36
Abscisic Acid Abscisic acid is involved in the
process of leaves and fruits falling from a
plant (abscission) Inhibits seed germination and
encourages dormancy Stimulates stomal closure if
plants begin to wilt DIAGRAM OF LEAF
ABSCISSION
37
Abscisic Acid Abscisic acid is involved in the
process of leaves and fruits falling from a
plant (abscission) Inhibits seed germination and
encourages dormancy Stimulates stomal closure if
plants begin to wilt DIAGRAM OF LEAF
ABSCISSION
38
Ethylene Ethylene is a gas and works externally.
It is produced in cells of the stems, ripening
fruits, senescing tissue and seeds Ethylene is
important in the ripening of fruit. The gas
stimulates the fruit to increase its respiration
rate which causes it to ripen Also involved in
leaf and flower senescence and abscission Promote
s seed germination
39
Ethylene Ethylene is a gas and works externally.
It is produced in cells of the stems, ripening
fruits, senescing tissue and seeds Ethylene is
important in the ripening of fruit. The gas
stimulates the fruit to increase its respiration
rate which causes it to ripen Also involved in
leaf and flower senescence and abscission Promote
s seed germination
40
Ethylene Ethylene is a gas and works externally.
It is produced in cells of the stems, ripening
fruits, senescing tissue and seeds Ethylene is
important in the ripening of fruit. The gas
stimulates the fruit to increase its respiration
rate which causes it to ripen Also involved in
leaf and flower senescence and abscission Promote
s seed germination
41
Ethylene Ethylene is a gas and works externally.
It is produced in cells of the stems, ripening
fruits, senescing tissue and seeds Ethylene is
important in the ripening of fruit. The gas
stimulates the fruit to increase its respiration
rate which causes it to ripen Also involved in
leaf and flower senescence and abscission Promote
s seed germination
42
Ethylene Ethylene is a gas and works externally.
It is produced in cells of the stems, ripening
fruits, senescing tissue and seeds Ethylene is
important in the ripening of fruit. The gas
stimulates the fruit to increase its respiration
rate which causes it to ripen Also involved in
leaf and flower senescence and abscission Promote
s seed germination
43
Ethylene Ethylene is a gas and works externally.
It is produced in cells of the stems, ripening
fruits, senescing tissue and seeds Ethylene is
important in the ripening of fruit. The gas
stimulates the fruit to increase its respiration
rate which causes it to ripen Also involved in
leaf and flower senescence and abscission Promote
s seed germination
44
Plant hormones are more generalised than those of
animals. Think Compare the varied roles auxin
has within a plant and to the specific role of
insulin in animals
45
The end Its 1143 and I want some dinner