In Arabidopsis, it is well-known that a pulse of full-spectrum light during the night (in an otherwiselong night) will induce flowering. This suggests that plants measure the length of night, and not thelength of day.Using what you know about the molecular genetics of the photoperiod pathway for the inductionof flowering in Arabidopsis, explain why this pulse of light at night is capable of inducing flowering.

The developmental response of the plant, especially the flowering phenomena in relation to the…

Answered: Using what you know about the molecular…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

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In Arabidopsis, it is well-known that a pulse of full-spectrum light during the night (in an otherwise
long night) will induce flowering. This suggests that plants measure the length of night, and not the
length of day.
Using what you know about the molecular genetics of the photoperiod pathway for the induction
of flowering in Arabidopsis, explain why this pulse of light at night is capable of inducing flowering.

Expert Solution

Introduction

The developmental response of the plant, especially the flowering phenomena in relation to the exposure of light period (day) is known as photoperiod.
With respect to the length of day required for proper plant response and growth, it is classified into three types:

Short day plants - the critical photoperiod requirement is 14 h of dark (night).
Long day plants - the critical photoperiod requirement is 14 h light.
Neutral plants - They are unaffected by the photoperiod.

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