For faster navigation, this Iframe is preloading the Wikiwand page for
光週期現象.
光週期現象是生物體對夜晚或黑暗時期長度的生理反應。它存在於植物、動物以及果實中。光週期也可以定義為植物對光照和黑暗週期的相對長度的生長反應。根據光週期,它們分為三組:短日照植物、長日照植物和日中性植物。
植物
植物會因為日照時間的長短(實際上是黑暗時間長短)而轉變生長模式開始開花的現象。又可分為長日照植物和短日照植物。長日照植物(Long-Day Plants)指植物光照時間超過其臨界日照時間後就會開始萌發花芽的植物。短日照植物(Short-Day Plants)則是光照時間低於其臨界日照時間(長黑暗)後就會開始萌發花芽的植物。
研究發現如果在長黑暗期間對植物照射紅光會打破光週期,但如果照射紅光後再照射遠紅光,使光敏素恢復原來黑暗中的型態,可避免原本長黑暗的光週期被破壞。
另外日中性植物(Day-neutral plants),指不受光週期影響,養分累積足夠或幼年性結束到達成熟期就會開花的植物。
{{bottomLinkPreText}}
{{bottomLinkText}}
This page is based on a Wikipedia article written by
contributors (read/edit).
Text is available under the
CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.
{{current.index+1}} of {{items.length}}
Thanks for reporting this video!
This browser is not supported by Wikiwand :(
Wikiwand requires a browser with modern capabilities in order to provide you with the best reading experience.
Please download and use one of the following browsers:
An extension you use may be preventing Wikiwand articles from loading properly.
If you're using HTTPS Everywhere or you're unable to access any article on Wikiwand, please consider switching to HTTPS (https://www.wikiwand.com).
An extension you use may be preventing Wikiwand articles from loading properly.
If you are using an Ad-Blocker, it might have mistakenly blocked our content.
You will need to temporarily disable your Ad-blocker to view this page.
✕
This article was just edited, click to reload
Please click Add in the dialog above
Please click Allow in the top-left corner,
then click Install Now in the dialog
Please click Open in the download dialog,
then click Install
Please click the "Downloads" icon in the Safari toolbar, open the first download in the list,
then click Install
{{::$root.activation.text}}
Follow Us
Don't forget to rate us
Oh no, there's been an error
Please help us solve this error by emailing us at
support@wikiwand.com
Let us know what you've done that caused this error, what browser you're using, and whether you have any special extensions/add-ons installed.
Thank you!