photoperiodism

简明释义

英[ˌfəʊtəʊˈpɪərɪəˌdɪzəm]美[ˌfotoˈpɪriəˌdɪzəm]

n. [农学] 光周期现象（=photoperiodicity）；[生物] 光周期性（=photoperiodicity）

英英释义

单词用法

同义词

反义词

例句

1.The respose was not caused by the effects of temperature, photosynthetic duration or pre-flowering photoperiodic after-effect but was typical photoperiodism.

这种反应属于典型的光周期现象，而不是由温度的替代作用、光合时间的改变或前期短日后效应引起的。

2.The respose was not caused by the effects of temperature, photosynthetic duration or pre-flowering photoperiodic after-effect but was typical photoperiodism.

这种反应属于典型的光周期现象，而不是由温度的替代作用、光合时间的改变或前期短日后效应引起的。

3.Photoperiodism The response of an organism to changes in day length.

植物对于日照长度改变所引起的反应。

4.Many plants exhibit photoperiodism, which is their response to the length of day and night.

许多植物表现出光周期性反应，这是它们对昼夜长度的反应。

5.Farmers often rely on photoperiodism to determine the best time for planting crops.

农民常常依赖光周期性反应来确定最佳的播种时间。

6.Certain flowers bloom only during specific seasons due to photoperiodism.

某些花朵由于光周期性反应而仅在特定季节开放。

7.Understanding photoperiodism can help horticulturists manipulate flowering times.

理解光周期性反应可以帮助园艺师操控开花时间。

8.Animals also exhibit photoperiodism, affecting their breeding cycles.

动物也表现出光周期性反应，影响它们的繁殖周期。

作文

Photoperiodism is a fascinating biological phenomenon that refers to the response of organisms to the length of day or night. This concept is particularly significant in the world of plants, as it determines their growth, flowering, and reproductive cycles. The term photoperiodism (光周期现象) is derived from two words: 'photo' meaning light, and 'periodism' referring to the duration of time. Understanding photoperiodism is crucial for both agricultural practices and ecological studies, as it influences how plants adapt to their environments throughout the seasons. In nature, different species exhibit varying responses to changes in light duration. There are three main categories of photoperiodism (光周期现象): short-day plants, long-day plants, and day-neutral plants. Short-day plants, such as chrysanthemums and poinsettias, require longer nights to initiate flowering. Conversely, long-day plants, including spinach and clover, bloom when the nights are shorter. Day-neutral plants, like tomatoes and cucumbers, do not rely on light duration for flowering and can bloom regardless of the photoperiod. The mechanism behind photoperiodism (光周期现象) involves a plant hormone called florigen, which is produced in response to specific light conditions. When the days become longer or shorter, it triggers hormonal changes that signal the plant to either start or halt its flowering process. This intricate system allows plants to synchronize their reproductive cycles with seasonal changes, ensuring that they flower at the most advantageous times for pollination and seed dispersal. Farmers and horticulturists have harnessed the principles of photoperiodism (光周期现象) to optimize crop yields. By understanding the specific light requirements of different plants, they can manipulate growing conditions to enhance flowering and fruiting. For example, in regions where natural light conditions may not be ideal, growers can use artificial lighting to extend the photoperiod for long-day plants, thus improving their harvests. Conversely, short-day plants can be grown in controlled environments where light exposure is minimized to promote flowering. Moreover, photoperiodism (光周期现象) is not limited to plants; it also plays a significant role in the animal kingdom. Many animals, including birds and mammals, rely on changes in daylight to regulate their breeding cycles. For instance, certain bird species migrate based on the length of daylight, while some mammals, like deer, enter mating seasons in response to changing photoperiods. This synchronization ensures that offspring are born during optimal conditions for survival. In conclusion, photoperiodism (光周期现象) is a critical aspect of life on Earth, influencing both plant and animal behavior. Its impact on agriculture and ecology cannot be overstated, as it helps organisms adapt to their environments and thrive in various conditions. As we continue to explore the complexities of this phenomenon, we gain valuable insights into the interconnectedness of life and the importance of light in shaping the natural world. Understanding photoperiodism (光周期现象) will not only enhance agricultural practices but also deepen our appreciation for the intricate relationships that exist within ecosystems.

光周期现象是一个迷人的生物现象，指的是生物体对昼夜长度的反应。这个概念在植物世界中尤为重要，因为它决定了植物的生长、开花和繁殖周期。术语photoperiodism（光周期现象）来源于两个词：“photo”意为光，“periodism”指时间的持续。理解photoperiodism对于农业实践和生态研究至关重要，因为它影响植物如何在四季中适应环境。 在自然界中，不同物种对光照时长的变化表现出不同的反应。photoperiodism（光周期现象）主要有三种类型：短日照植物、长日照植物和日中性植物。短日照植物，如菊花和一品红，需要更长的夜晚才能开始开花。相反，长日照植物，如菠菜和苜蓿，当夜晚较短时开花。日中性植物，如番茄和黄瓜，则不依赖光照时长开花，可以在任何光周期下开花。 photoperiodism（光周期现象）背后的机制涉及一种称为花青素的植物激素，它是根据特定光照条件产生的。当白天变长或变短时，会触发激素变化，向植物发出开始或停止开花的信号。这一复杂的系统使植物能够将繁殖周期与季节变化同步，确保它们在最有利于授粉和种子传播的时机开花。 农民和园艺师利用photoperiodism（光周期现象）的原理来优化作物产量。通过了解不同植物的特定光照需求，他们可以操控生长条件以增强开花和结果。例如，在自然光条件可能不理想的地区，种植者可以使用人工照明来延长长日照植物的光周期，从而改善收成。相反，短日照植物可以在控制环境中生长，减少光照暴露以促进开花。 此外，photoperiodism（光周期现象）不仅限于植物；它在动物王国中也发挥着重要作用。许多动物，包括鸟类和哺乳动物，依靠日照长度的变化来调节繁殖周期。例如，某些鸟类根据日照长度迁徙，而一些哺乳动物，如鹿，则在光周期变化时进入交配季节。这种同步确保了幼崽在最佳生存条件下出生。 总之，photoperiodism（光周期现象）是地球生命的一个关键方面，影响着植物和动物的行为。它对农业和生态的影响不可低估，因为它帮助生物体适应环境并在各种条件下繁荣发展。随着我们继续探索这一现象的复杂性，我们获得了对生命相互联系的宝贵见解，以及光在塑造自然世界中的重要性。理解photoperiodism（光周期现象）不仅会增强农业实践，还会加深我们对生态系统内存在的复杂关系的欣赏。