Does photoperiod affect reproduction in plants?

Last Update: April 20, 2022

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Asked by: Prof. Rachael Ziemann MD
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Photoperiod affects reproduction in seasonal breeders, both plants and animals. ... In animals photoperiod affects the seasonal breeder through changes in melatonin secretion by the pineal gland. ... It occurs in plants and animals. Its is considered as effect on growth and development of the organism.

How does photoperiod affect reproduction?

Often reproduction is triggered by a critical photoperiod. In many male animals, testis size is affected by photoperiod. ... When the photoperiod is longer than 12.5 hours, the testes enlarge (testicular recrudescence). Female hamsters have a similar critical day length so that the breeding cycle of both sexes coincide.

How does Photoperiodism affect plant growth?

Photoperiodism affects flowering by inducing the shoot to produce floral buds instead of leaves and lateral buds. Some short-day facultative plants are: Kenaf ( Hibiscus cannabinus)

What is photoperiod affect?

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.

What organisms does photoperiod affect?

Photoperiodicity affects reproductive performance in a variety of species, including many types of freshwater and marine fishes (Crim, 1982; Peter, 1982), birds (Wingfield et al., 1997), and rodents (Heideman and Sylvester, 1997).

Photoperiodism | Plant Biology | Khan Academy

20 related questions found

What causes photoperiodism?

Many models have been suggested over the years, but today, most biologists think photoperiodism—at least, in many species—is the result of interactions between a plant's "body clock" and light cues from its environment. Only when the light cues and the body clock line up in the right way will the plant flower.

Who studied photoperiodism?

Photoperiodism was first studied by Garner and Allard.

What is photoperiod sunlight?

Photoperiod refers to the time that a plant or animal is exposed to light in a 24-hour period. Many types of plants require certain lengths of light exposure to enter various life cycle stages. ... Some plants also respond favorably to a longer than natural photoperiod by producing a more abundant harvest yield.

What is grand period of growth?

: the time during which a cell, organ, or organism is developing especially : that period of development characterized by rapid increase in size.

What is the importance of photoperiodism in plants?

Phytochrome is a pigment that helps in photoperiodic induction. The Photoperiodism is very essential for plant hybridisation experiments and helps the plant to produce flowers throughout the year in different seasons.

Do plants need dark?

Plants, shrubs and trees use sunlight for photosynthesis during the daytime, but at night they need darkness to regenerate a key compound - phytochrome. Nighttime lighting can reduce vegetation's ability to properly create this compound.

What factors affect plants?

Environmental factors that affect plant growth include light, temperature, water, humidity, and nutrition. It is important to understand how these factors affect plant growth and development.

Why do plants grow faster in the dark?

Plant Growth in Darkness

Plants grow fast in the dark, and do so because they operate on circadian cycles. ... In simplistic terms, it makes sense that plants would grow at night since daylight activity consists of absorbing light for photosynthesis.

How photoperiod affects reproduction in plants and animals?

photoperiod affects reproduction in seasonal breeders, both plants and animals. ... In animals photoperiod affects the seasonal breeder through changes in melatonin secretion by the pineal gland. The reproductive axis is controlled by melatonin which is secreted at night only and therefore relays day length to the body.

What is the role of photoperiod in plants and animals?

Photoperiodism is the ability of plants and animals to measure environmental day length (photoperiod), a process that underlies the so-called biological calendar [225]. The biological ability to measure day length permits organisms to ascertain the time of year and engage in seasonally appropriate adaptations.

Which hormone is responsible for Photoperiodism?

It is hypothesized that photoperiodism is controlled by a flowering hormone called florigen, although such a hormone has never been identified. Scientists do know, however, that photoperiod (length of night and day) is detected by leaves, which signal buds to open when nighttime hours reach an appropriate duration.

What is plant growth curve?

The rate of growth of a plant or plant part is not always the same during its life span. ... If we plot the increase in cell number (growth rate) against time, a typical S-shaped curve is obtained. This is called growth curve or sigmoid growth curve.

What is plasticity in plant growth?

Plasticity is the ability of the plant to adjust to a particular environment by altering the rate of growth, development, and metabolism. It allows the initiation of the cell division from any tissue of the plant, the ability to regenerate the lost organs and to undergo several developmental pathways for its survival.

What is a growth short answer?

growth refer to a positive change in size and/ or maturation,often over a period of time. Growth can occur as a stage of maturation or a process toward fullness or fulfillment.

Are cucumbers photoperiod?

It was shown that the response of the cucumber plants to a photoperiod over 20 h, including continuous light, depending on the plant age and light intensity, may include leaf movement or paraheliotropism, non-photochemical energy dissipation, and/or reversible photoinhibition of a reaction center of photosystem II, ...

How many hours of dark do plants need?

Long-Day Plant (LD): A long-day plant requires >12 hours of sunlight, or <12 hours of uninterrupted darkness, to produce a bloom or flower. Short Day Plant (SD): A short-day plant requires <12 hours of sunlight, or >12 hours of uninterrupted darkness, to produce a bloom or flower.

What is it called when a plant reacts to touch?

sensitive plant, (Mimosa pudica), also called humble plant, plant in the pea family (Fabaceae) that responds to touch and other stimulation by rapidly closing its leaves and drooping.

Which light is absorbed by phytochrome?

Phytochrome acts as a molecular switch in response to red and far-red light. It occurs in two reversible conformations (Pr and Pfr), which absorb red light (R) and far-red light (FR) respectively.

How do plants use photoperiodism?

Photoperiodism is the response to changes in daylength that enables plants to adapt to seasonal changes in their environment. The best studied example of photoperiodism in plants is flowering, but other responses to daylength include bud dormancy and bulb or tuber initiation.

What is an example of photoperiodism?

Photoperiodism is a term in biology for the way a plant or animal reacts to the amount of light it gets at a time, including flowering or not flowering. An example of photoperiodism is when a plant doesn't bloom during the increased darkness of winter time.