What is photoperiodic stimulus?

The photoperiodic stimulus is received by the leaves and is apparently transmitted to the part that actually enlarges to develop into the storage organ, such as tubers and bulbs. The responses of plants to photoperiodic stimuli are numerous and very diverse.

What is photoperiodic response?

photoperiodism, the functional or behavioral response of an organism to changes of duration in daily, seasonal, or yearly cycles of light and darkness. Photoperiodic reactions can be reasonably predicted, but temperature, nutrition, and other environmental factors also modify an organism’s response.

Would a defoliated plant respond to photoperiodic cycle Why?

For the perception of photoperiodic cycle, presence of leaves under inductive photoperiod is essential, so that, the hormone required for flowering can be produced. Therefore, in the absence of leaves, i.e, in a defoliated plant light perception would not occur, i.e., the plant would not respond to light.

Which substance of the plant is responsible for photoperiodic stimulus?

Today, we know that proteins called phototropins are the main photoreceptors responsible for light detection during phototropism—the name is a handy reminder of their role! Like other plant photoreceptors, phototropins are made up of a protein bound to a light-absorbing organic molecule, called the chromophore.

Which part of the plant perceives photoperiodic stimulus and how does it transmit?

Photoperiodic stimulus is perceived by the leaves and a floral hormone is produced in the leaves which are then translocated to the apical tip, subsequently causing initiation of floral primordia.

What is photoperiodic requirement?

The relative length of day and night is known as photoperiod. Some plants need to be exposed to sunlight for a particular duration of time to induce flowering. This is the reason behind the seasonal blooming of flowers.

How do plants respond to photoperiodic stimulus?

In phototropism a plant bends or grows directionally in response to light. Shoots usually move towards the light; roots usually move away from it. In photoperiodism flowering and other developmental processes are regulated in response to the photoperiod, or day length.

Would a defoliated plant respond to photoperiodic cycle 1 Yes 2 No 3 can’t say 4 Any condition is possible?

No, a defoliated plant will not respond to photoperiodic cycle or stimulus. The photoperiodic is perceived by leaves as, the site of perception of light/dark duration are the leaves, which have been removed in a defoliated plant.

What is the florigen concept?

From Wikipedia, the free encyclopedia. Florigen (or flowering hormone) is the hypothesized hormone-like molecule responsible for controlling and/or triggering flowering in plants. Florigen is produced in the leaves, and acts in the shoot apical meristem of buds and growing tips.

• Photoperiodic stimulus is perceived by the leaves and a floral hormone is produced in the leaves which are then translocated to the apical tip, subsequently causing initiation of floral primordia. • Photoperiodic stimulus perceived by the leaves can be shown by a simple experiment on cocklebur (xanthium), a short day plant.

What is photoperiodism and why is it important?

Photoperiodism refers to one of the plant’s mechanisms where it can sense the alternations in the day and night length through the photoreceptor proteins and decide when to induce flowering. That’s why different plant species develop flowers in different seasons, which is only due to the difference in the photoperiod length.

What are the three classes of photoperiodism?

Depending upon the photoperiodic effect on flowering, the plants are grouped into three classes, namely long day, short day and day-neutral plants. Garner and Allard were the two scientists who introduced the phenomena of photoperiodism in the year 1920.

How is photoperiodic stimulus transmitted from one branch to another branch?

The photoperiodic stimulus can be transmitted from one branch of the plant to another branch. For example, if in a two branched cocklebur plant one branch is exposed to short day and other to long day photo period, flowering occurs on both the branches (Fig. 18.3 A).