LOV2 domain is essential for blue light–induced kinase activation and autophosphorylation of the phototropin photoreceptor.

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Collenchyma cells

Collenchyma cells are generally elongated cells that have thicker primary walls than parenchyma cells,

Collenchyma cells provide flexible support without restraining growth

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Sclerenchyma cells

Intercellular Space absen

The secondary cell wall, produced after cell elongation has ceased, is thick and contains large amounts of lignin

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Xylem, Phloem and cambium form the major part of the vascular bundle found in stelar part.

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Epidermis ;

Consist of single layered, tightly placed, thin walled, uncutinised cells called as Epiblema or Rhizodermis.

Epiblema in younger roots bears Unicellular root hairs and is also called Pilliferous layer

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Cortex ;

Consist of thin walled parenchymatous cells with intercellular spaces. Innermost layer of cortex is known as Endodermis