There are two types of intercalated cells: type A and type B

TLS Online TPP Program

#Id: 7568

#Unit 6. System Physiology – Plant

KNOX genes

KNOX gene expression increases cytokinin levels in the shoot apical meristem by upregulating the cytokinin biosynthetic gene ISOPENTENYL TRANSFERASE7 (IPT7)

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#Id: 7569

#Unit 6. System Physiology – Plant

Cytokinin maintains meristem by controlling cell division

 Deficient mutants – lonely guy (LOG)/STM

 Gene activates cytokinins

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#Id: 7570

#Unit 6. System Physiology – Plant

Organo-genesis

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#Id: 10114

#Unit 6. System Physiology – Plant

Indole-3-acetic acid (IAA) occurs in all plants, 

Peas contain 4-chloroindole-3-acetic acid. 

Mustards and corn contain indole-3- butyric acid (IBA).

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#Id: 10115

#Unit 6. System Physiology – Plant

Rapidly dividing tissues, shoot apical meristems, young leaves, and developing fruits and seeds are the primary sites of IAA synthesis.

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#Id: 10116

#Unit 6. System Physiology – Plant

IAA is synthesises by tryptophan and is primarily synthesized in a two-step process 

Indole-3-pyruvate (IPyA) as the intermediate. 

The second step in the pathway is carried out by the YUCCA gene product, a tryptophan aminotransferase.