Activity of the cambial ring

Cambial ring becomes active and begins to cut off new cells, these cut off cells towards pith, mature into secondary xylem and the cells cut off towards periphery mature into secondary phloem

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#Id: 9804

#XL - R Botany

PAS-related domain (PRD) repeats mediate phytochrome dimerization. 

The PRD domain targets the Pfr form of phyB to the nucleus, although it lacks a canonical nuclear localization signal (NLS).

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#Id: 9805

#XL - R Botany

In higher plants the phytochrome chromophore is a linear tetrapyrrole called phytochromobilin

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#Id: 9806

#XL - R Botany

Pr chromophore undergoes a cis–trans isomerization between carbons 15 and 16 and rotation of the C14-C15 single bond on red light exposure.

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#Id: 9807

#XL - R Botany

Phytochromobilin is synthesized in plastids from chlorophyll biosynthetic pathway and transported into cytosol by a passive process.

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#Id: 9808

#XL - R Botany

Phytochromobilin is exported from the plastid to the cytosol where it autocatalytically attaches to the PHY apoprotein through a thioether linkage to a cysteine residue.

TLS Online TPP Program

#Id: 9809

#XL - R Botany

hy1 and hy2 mutant are chromophore biosynthesis mutant: which fail to supress hypocotyl elongation