Class (24) =Auxin | Introduction, Function & Application of Auxin | Types of Plant Hormone (Part 1)

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Plant hormones, also known as phytohormones, are chemicals that regulate plant cell processes. They are signal molecules produced within the plant functioning in extremely low concentrations
Five major types of plant hormones
1. Auxin
2. Gibberellin
3. Cytokinin
4. Ethylene
5. Abscisic acid
Plant growth regulators usually are defined as organic compounds, other than nutrients, that in small concentrations, affect the physiological processes of plants”. In practical purpose, they are defined as either natural or synthetic compounds that are applied directly to plant to alter its life processes/structure in some beneficial way so as to enhance yield, improve quality and facilitate harvesting. When herbicides are applied to induce a specific beneficial change, then they are considered as plant growth regulators. If the compound is produced within the plant it is called a plant hormone. The term "hormone" is derived from a Greek word meaning “to arouse or stimulate or enhance an activity
1. Auxins
Auxin is the first plant hormone/growth substance discovered. The term comes from the Greek word, auxein means "to grow". Compounds are generally considered as auxins if they are synthesized by the plant and have similar activity to Indole-3- acetic acid (IAA).
Discovery of Auxins
Charles Darwin was the first scientist who performed early auxin experiments on canary grass (Phalaris canariensis) coleoptiles. He observed the effects of a hypothetical substance modulating plant shoot elongation to allow tropic growth toward light. IAA is the major auxin involved in many of the physiological processes in plants
Functions of Auxin
The following are some of the responses that auxin is known to cause
1. Stimulates cell loosening, expansion and elongation.
2. Initiation of adventitious roots on stem cuttings
3. Lateral root development in tissue culture
4. Stimulates differentiation of phloem and xylem
5. Stimulation of abscission (young fruits) or delay of abscission
6. Stimulates cell division in tissue culture in combination with cytokinins
7. Mediates the tropistic response of bending in response to gravity and light
2. Gibberellins
Gibberellins are synthesized in young tissues of the shoots, uncertainly in roots and also in the developing seeds. There are also some evidences that leaves may be the source of some biosynthesis
3. Cytokinins
In Cytokinin, cyto = cell + kinin = division, i.e. meaning is cell division. Cytokinin is also called as cytokine. These are the compounds resembling with adenine (aminopurine) which stimulates cell division.
4. Ethylene
Ethylene has simplest structure among all the plant hormones. It is a gaseous compound that has effects like an abscisic
5. Abscisic Acid
Abscisic acid (ABA) controls several physiological processes in plants and best known for regulatory role in abiotic stresses like drought and high salinity. It promotes stomatal closing by which plants enable to adapt to water stress (desiccation tolerance). It also controls seed germination, vegetative growth and bud dormancy
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प्लांट का भी जनरल नॉलेज दो. ताकी आम आदमी इसका उपयोग कर पाए. डोज़ बता सकते हो. पावर पॉइंट प्रेजेंटेशन हो सकता है. लोग गलत इस्तेमाल करते है. इफेक्टिव तरीके बताये. Make small booklet and sell.

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[@Rahul_Mahour_14]

Thanx Ma'am...😊

[@Cartoon_moralstory11]

Great explanation ❤😊

[@rupeshkumarshortss]

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[@amitsinghtomar11]

Tq mam very helpful video

[@universal6704]

Ma'am kindly tell me which device is the plant sensation measured

[@nidhiyadav3569]

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[@solutionpharmacy]

Thank you

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[@dilawarhussain2545]

Thanks Ma'am

[@TheHope045]

Thank you mam

[@aaquib608]

Very helpful :)
Please upload next hormone video soon

[@tarunkumargoyal7532]

Very informative ma'am.

[@durgeshsingh6447]

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[@manishakhadka5032]

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[@napinderkotli]

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[@drxdrx8159]

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[@ankurpatel1127]

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Mam this is toooooo important for .me
Thanks mam

[@unknownagriculture2918]

Thanks a lot .......mam

[@tamanna8834]

Very nice video mam

[@rahulchoudhari9968]

Can we use NAA for mango plant??

[@bamangmeku6316]

Yes, to heal the cut ends and to overcome from Mango Malformation in alphanso.

[@abhisekray3207]

IBA{indole butyric acid } is natural auxins mam

[@avradipghosh799]

No, IBA (indole butyric acid) is synthetic or artificial auxin.

[@kapildeoyadav4507]

indole acetic acid

[@Islamicvedio871]

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[@nafsinrede9916]

❤❤

[@krishan9766]

Madem phytoplasm ke bare bi btao

[@khizikhokhar6107]

auxin prevents abscission ,,I think

[@darshanhemani583]

Indole Butyric Acid is the natural Auxin not synthetic

[@9649968517]

IBA is a natural auxin

[@priyankasaxena8319]

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[@rajanderkumar4689]

Ma'am please don't provide wrong information. IBA is natural auxin

[@solutionpharmacy]

This reply is from solution editor- Please give us your reference with complete detail. We will try to correct if somthing is wrong by our side

[@rajanderkumar4689]

Solution- Pharmacy
In class 11 ncert chapter 15 plant growth and development under the heading of auxin IAA and IBA are given as natural auxins isolated from plants.
Thankyou

[@solutionpharmacy]

@@rajanderkumar4689 Yes you r right.We have taken reference of c.k. kokate "text book of pharmacognosy " fiftieth edition. Long ago It was considered as synthetic auxin but now it comes under the category of natural hormone

[@lidiyanipnal5521]

IBA is natural hormone

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Thank you ma'am...

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Very nice mam 👍

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Thanku mam