Role of Plant growth regulators (PGRs) in plant growth and development.

00:03:49
https://www.youtube.com/watch?v=yhofPHB3t5M

Summary

TLDRThe video explores plant growth regulators (PGRs), detailing eight types including auxin, gibberlin, cytokinin, ethylene, abscisic acid (ABA), and Brazilian steroids. Auxin facilitates cell wall loosening, promotes root growth, and prevents premature leaf drop, making it essential for horticultural practices. Gibberlin is key for shoot elongation and breaking seed dormancy. Cytokinin encourages lateral growth and prevents senescence. Ethylene, a gaseous hormone, is pivotal in fruit ripening. ABA acts as a growth inhibitor during stress. Brazilian steroids assist with cell division and stress tolerance. The next lecture will delve into PGRs in plant tissue culture.

Takeaways

  • 🌱 Auxin promotes root growth and prevents premature leaf drop.
  • 🌾 Gibberlin enhances shoot elongation and breaks dormancy in seeds.
  • 🌿 Cytokinin prevents apical dominance and promotes lateral shoot growth.
  • 🍌 Ethylene is crucial for fruit ripening processes.
  • 🚫 Abscisic acid acts as a growth inhibitor during stress.
  • 🌱 Brazilian steroids help in cell division and stress responses.
  • 📈 Commercial applications of PGRs improve agricultural yields.
  • 🍇 Seedless fruits can be produced using auxin.
  • 🌼 Ethylene promotes female flower production in certain plants.
  • 📊 Future videos will cover plant tissue culture and its relation to PGRs.

Timeline

  • 00:00:00 - 00:03:49

    The video discusses plant growth regulators (PGRs) that influence plant growth and development. It highlights eight types of PGRs, starting with auxin, which promotes root growth, prevents premature leaf drop, and enhances lateral growth in response to pruning. Auxin also aids in producing seedless fruits and acts as a herbicide. The second PGR, gibberellin, is crucial for shoot elongation, breaking seed dormancy, and enhancing germination, particularly in brewing. Cytokinins, the third PGR, promote lateral growth and delay leaf senescence. Ethylene, a gaseous PGR, accelerates fruit ripening and is used commercially for various fruits. Abscisic acid operates as a growth inhibitor, providing stress tolerance by closing stomata. Other PGRs, like brassinosteroids, jasmonic acid, and salicylic acid, are also discussed for their roles in stress response and growth regulation. The summary concludes with a preview of the next lecture on plant tissue culture related to PGRs.

Mind Map

Video Q&A

  • What are plant growth regulators?

    They are substances that regulate plant growth and development.

  • What is the main role of auxin?

    Auxin promotes root growth, prevents premature leaf drop, and aids in cell division and expansion.

  • How does gibberlin affect plants?

    Gibberlin promotes internode and shoot elongation, breaks dormancy, and aids starch conversion to sugar.

  • What is the effect of cytokinin on plants?

    Cytokinin prevents apical dominance, promotes lateral shoot growth, and delays senescence.

  • What role does ethylene play in fruit ripening?

    Ethylene increases respiration rates and is used commercially to ripen fruits.

  • What is abscisic acid's role in plants?

    ABA has a growth inhibitory role and is involved in stress tolerance.

  • How are Brazilian steroids classified?

    They are a group of PGRs that have diversified roles in plant growth and stress response.

  • What is the next topic in the series?

    The next video will focus on the role of plant growth regulators in plant tissue culture.

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  • 00:00:00
    hello and welcome back to explore bio
  • 00:00:01
    today we will learn about plant growth
  • 00:00:03
    regulators or pgrs and what role they
  • 00:00:06
    play in regulation of growth and
  • 00:00:08
    development of plants we will also see
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    some of their practical or commercial
  • 00:00:13
    applications
  • 00:00:14
    in this video i will talk about eight
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    plant growth regulators
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    the first one is auxin it is a growth
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    promoting hormone that facilitates cell
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    wall loosening increases the cell wall
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    plasticity and helps in cell division
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    and expansion its major role is in root
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    growth promotion auxin prevents
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    premature leaf and fruit drop
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    it leads to epical dominance due to
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    which primary shoot grows more as
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    compared to lateral shoot
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    and removal of apical bird result in
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    enhanced growth of lateral shoot
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    horticulturists and gardeners often cut
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    the shoe tip to promote lateral growth
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    and bushiness
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    it promotes parts in a copy due to which
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    the fruits are produced seedless for
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    example application of auxin results in
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    seedless strawberry and grape production
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    240 which is an auxin is also used as a
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    herbicide to kill dicot plants
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    the second growth promoting pgr is
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    giberlin or ga
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    its most important role is in internode
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    and shoot elongation this makes it
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    suitable for increasing the yield of
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    sugarcane it breaks the dormancy in
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    seeds and birds and stimulates their
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    growth in seeds gibralian promotes
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    starch conversion to sugar and helps in
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    germination
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    this makes gibberin useful for brewing
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    as it breaks down starch to maltose in
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    barley seeds and others it delays plants
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    in a sense by translocation of
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    metabolites to those sites
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    commercial food producers is
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    pregibrillin on the fruits like grapes
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    to increase their size and fullness
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    the third growth promoting hormone or
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    pgr is cytokinin in contrast to auxin it
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    prevents apical dominance and promotes
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    lateral shoot growth it induces cell
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    division and also delays senescence
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    it prevents cellulose degradation and
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    thus prevents yellowing of late use leaf
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    after cutting the fourth pgr is ethylene
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    it is unique in the sense that it is
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    gaseous in nature it increases the
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    respiration rate and is well known for
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    its role in promoting fruit ripening
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    commercially it is used to ripen the
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    fruits like bananas and mangoes
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    it promotes senescence and root hair
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    formation
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    it leads to retro growth of the plant
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    commercially in plants like cucumber it
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    promotes female flower production
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    the fifth plant regulator is abscissic
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    acid or aba it has growth inhibitory
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    role
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    it suppresses burden to shoot growth and
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    often acts as gibralian antagonist
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    during various types of abiotic and
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    biotic stresses aba level increases this
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    imparts stress tolerance to the plant it
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    also results in stomatal closure
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    unlike other phytohormones ab is not
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    much utilized commercially
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    brazilian steroids are another group of
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    pgrs that has diversified role in cell
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    division elongation germination and
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    development it is also reported to play
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    a role in abiotic and biotic stress
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    tolerance
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    jasminic acid and salicylic acids are
  • 00:03:16
    also known to play important role in
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    stress responses this is the summary of
  • 00:03:21
    various types of plant growth regulators
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    and their important function
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    so that's all for today in my next
  • 00:03:27
    lecture i will be explaining the role of
  • 00:03:29
    plant growth regulators focusing
  • 00:03:31
    especially on plant tissue culture
  • 00:03:34
    for any suggestion or request do comment
  • 00:03:36
    or email me at explorebioat yahoo.com
  • 00:03:38
    check out my playlist on topics like
  • 00:03:40
    research and publishing genomics markers
  • 00:03:42
    techniques diseases and vaccines thanks
  • 00:03:45
    and see you in my next video
  • 00:03:47
    [Music]
Tags
  • plant growth regulators
  • auxin
  • gibberlin
  • cytokinin
  • ethylene
  • abscisic acid
  • Brazilian steroids
  • plant growth
  • stress tolerance
  • fruit ripening