Therefore, the colder the autumn, the more intense the celebration of “Momiji Gari” will be. Carbohydrates delay the release of ethanol (the gas that causes veins to open and anthocyanins begin to escape and leaves have less intense red hues. The veins close more, therefore, the sugar is separated into glucose, anthocyanins and carbohydrates.
The colder the fall, the redder the leaves.
In other words, those red pigments or “Anthocyanins” fill the leaves. When these react with other chemicals inside the plant, red pigments are formed. The reddish colours have another explanation: as the veins of the leaves close with the beginning of autumn, the sugars are trapped inside the leaves. Where does the red colour of maples leaves come from? In both cases, they are customs that began in ancient times at the Kyoto court and were popularized in the Edo era (1600-1868) to become events that define the national identity of the Japanese. The “Momiji Gari” is to autumn what cherry blossom viewing is to spring that is to say, the other great Japanese festival of celebration and contemplation of nature. There is a great variety of maples in the East, but the most representative species is the “Iroha Kaede” (Acer palmatum). In Japan when fall is colder, growers go into the forest to find the reddest maple leaves. The “Momiji Gari” is the “hunting of the red maples”. Hidefumi Ohmichi picture Do you know what “Momiji Gari” is? And once this pigment is gone, what you see are the other pigments (beta carotene and flavonol) that have always been there and that give the leaf a yellow or orange tone.īefore we did not see them because they were “masked” by chlorophyll. This concludes with the disappearance of the green colour. However, the leaves not only have chlorophyll: they also contain beta carotene (orange), anthocyanin (red) and flavonol (yellow). What happens when solar radiation does not hit the earth directly?Īs the days get shorter and the nights get longer, chlorophyll production slows down until the plant no longer produces it, eventually running out of chlorophyll. Millions of chlorophyll cells saturate the leaves of plants and trees, making them appear green to our eyes. For this reason, it is during spring and summer that chlorophyll breaks down and re-forms.Ĭhlorophyll is responsible for photosynthesis in plants, which is the process used to transform sunlight into food. Most of the leaves are green in colour due to the presence of chlorophyll, a pigment that participates in the photosynthesis process.
This phenomenon also has an impact on plants. This is caused by the position of the Sun with the Earth. While during the Winter Solstice it does so over an area of 2.24 m2 (it is less intense, since it is distributed over a larger surface).ĭuring winter, 1 m 2 of land surface receives less than half the energy it receives during summer, which is why the environment is colder. When a beam of solar radiation (Sunbeam), with a section of 1 m2, reaches the ground during the Summer Solstice, it is distributed over an area of 1.04 m2 (it is more intense in a smaller area). Solar radiation heats the earth’s surface more or less effectively depending on the height of the Sun above the horizon. This is called solar radiation, that is, the way the sun’s rays reach the earth depending on the height and distance of the sun from the earth. The most important one is the lesser availability of sunlight, or the way in which sunlight affects the plants according to the season in which we are. There are several factors that influence the change in the colour of the leaves. But why does that happen? Keep reading and I will tell you all about maple leaves. The leaves from the trees in the family of maples change colour with the seasons. Have you ever dreamt about having a tree in your collection that changed the colour of its leaves? It would be wonderful, right? Well, we have good news.
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