London: Leaves of Swiss cheese plants are unusually perforated to help them avoid stress, according to a new study.
Their familiar hole-riddled leaves allow the plants to capture sunlight more regularly helping them to survive in shady rainforests, found research by a US scientist.Commonly grown as house plants, they are found in the wild from southern Mexico to Colombia, the BBC Nature reported.
Many theories have been suggested for the unusual perforated leaves.
One is that the holes in the leaves allow the plants to resist hurricane winds, by letting the wind pass through. Another is that they allow better temperature regulation or water to run through the plants down to its roots.
Some have suggested the holes somehow camouflage the plants, hiding them from herbivores.
Research by Christopher Muir at the University of Indiana, in Bloomington, US, suggested that the holes are an adaptation to the plants` rainforest habitat.
The Swiss cheese plant Monstera deliciosa lives in the dark understorey of tropical rainforests. It relies on capturing unpredictable shafts of sunlight, known as "sunflecks", in order to photosynthesise for energy.
Muir questioned whether the sunflecks could explain the unusual leaf shapes so he used mathematical models to compare leaves with and without holes. He found that both leaf shapes benefit equally from the same amount of sunlight.
Although a leaf with holes will miss some sunlight, because it filters through the holes, solid leaves with the same surface area actually take up less space, so their access to sunlight is restricted.
Muir`s models revealed that a leaf with the same surface area, but riddled with holes, would contact sunlight more regularly because it takes up more space.
He suggested this regularity makes the altered leaf shape more reliable, causing the plant less stress giving it the best chance of survival.
But young Swiss cheese plants do not need holes in their leaves, according to Muir.
Monstera deliciosa grows differently at different stages of its life cycle. It is an epiphyte, or air plant, with aerial roots which attach to host trees, enabling it to climb.
The young plants are closer to the forest floor, where fewer flecks of sunlight reach. The poor quality of the light here means that holes do not benefit the plant, Muir predicted.
Only as the plant matures it grows taller, reaching parts of the understorey with more flecks of sunlight.
Then the leaves become larger, develop holes and are held away from the trunk, where they have a better chance of capturing the sunlight necessary to survive.
The study was published in The American Naturalist.
PTI
By clicking “Accept All Cookies”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts.
Cookies Setting
By clicking “Accept All Cookies”, you agree to the storing of cookies on your device and the processing of information obtained via those cookies (including about your preferences, device and online activity) by us and our commercial partners to enhance site navigation, personalise ads, analyze site usage, and assist in our marketing efforts. More information can be found in our Cookies and Privacy Policy. You can amend your cookie settings to reject non-essential cookies by clicking Cookie Settings below.
Manage Consent Preferences
Strictly Necessary Cookies
These cookies are necessary for the website to function and cannot be switched off in our systems. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. You can set your browser to block or alert you about these cookies, but some parts of the site will not then work or you may not be able to login.
Functional Cookies
These cookies enable the website to provide enhanced functionality and personalisation. They may be set by us or by third party providers whose services we have added to our pages. If you do not allow these cookies then some or all of these services may not function properly.
Targeting Cookies
These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites. They are also used to limit the number of times you see an advert as well as help measure the effectiveness of an advertising campaign. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. If you do not allow these cookies, you will experience less targeted advertising.
Performance Cookies
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we may not know when you have visited our site, and may not be able to monitor its performance.