英語の後に日本語が続きます。
The ginkgo (Ginkgo biloba), a gymnosperm plant, has male and female trees. The male does not produce flowers but pollen while the female produces fruits from September to November. In Central Tokyo, you can see many ginkgo trees but most of them in the office district are male to prevent people from stepping on the fruits. Ginkgo fruits are so stinky, smelling like something rotten, when raw that nobody wouldn't want to step on them but they're considered one of the autumn delicacies in Japan.
Its leaves turn bright yellow (or golden!) beautifully. According to "
The Process of Leaf Color Change,"
in autumn triggered by shorter days and lower temperatures the leaves stop their food making process. The chlorophyll breaks down, the green colour disappears and the yellow and orange colours become visible. At the same time other chemical changes may occur which form additional colours through the development of red pigments. Some mixtures give rise to reddish and purplish autumn colours such as dogwoods and sumachs, while others give maple its brilliant orange. The autumn foliage of some trees show only yellow colours, whilst others like oaks show only brown. All these colours are the varying amounts of the chlorophyll residue and other pigments in the leaf.
The next question is how? Does the color change happen in all parts of the leaves at the same time or from one part to another? You can see the answer in the last two photos of ginkgo leaves changing yellow from the edge to the middle😊!
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イチョウ（銀杏）です。裸子植物なので雄と雌があり、都心は通行人が臭い実を踏まないように大体雄なのですが、もちろん雌の木もあります。本当に臭いです。が、青空に映える黄金色の銀杏の葉の美しさは格別です。
紅葉のメカニズムですが、
毎日新聞によると「気温が下がり、日照時間が短くなると、葉への栄養供給が止まる。その結果、クロロフィルが分解され、別の色素と作用して色付く」とのこと。でもどのように紅葉するかはご存じですか。全体的に徐々に紅葉するのか、それとも葉の一部から他の部分へと順繰りに紅葉するのか？最後の写真に答えがあるような気がします。葉の先の方から中ほどに向かって色付いてます😊。
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