Name: 寄生植物の奇妙な世界 (The Weird World of Parasitic Plants)
Uploaded: 2021-01-14T05:11:58.000Z
Duration: 2 min 20 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Hi guys! As something of a belated Halloween episode, today I'm going to be talking about

副詞形分詞節

a couple of really cool parasitic plants. When talking about parasitic plants, there

関係詞節（制限と非制限）

are a couple of terms that come in handy when describing these plants. The first pair of

these is facultative and obligate. A facultative parasitic plant can complete its life cycle

without its host, though it would prefer to have its host. An obligate parasite has to

have its host to complete its life cycle. A second pair of terms is holoparasite and

hemiparasite. Now a holoparasite has to no chlorphyll, meaning its completely reliant

on its host for nutrients. A hemiparasite, however, might have some chlorophyll, so it

can produce some of its own nutrients, but still needs its host.

So the first of the parasitic plants I'm going to talk about is a holoparaiste, and that's

the Albino Redwood, Sequoia sempervirens. Now most redwoods are large, normal trees

that have chlorophyll to produce their own nutrients. And albino redwood is a mutant

that doesn't contain chlorophyll, which is why its leaves look like this. And it because

it doesn't contain chlorophyll it can't create its own nutrients. As a solution, albino redwoods

graft their root systems onto the root systems of healthy redwoods so that they can gain

nutrients that way. There are only a handful of these albino redwoods known to exist, and

their locations are kept secret to keep them safe.

Now a parasitic plant you might not normally think of is mistletoe. Mistletoe describes

a lot of plants, but one specific example is Viscum album, European Mistletoe. Mistletoe

grows on the trunks of trees and absorbs its nutrients by leeching them from the tree.

They would also be a hemiparasite, because they do contain some chlorophyll to produce

their own nutrients. Mistletoe is actually poisonous because it contains viscumin, a

compound that inhibits protein synthesis in cells.

Now this last parasitic plant is a weird one. Its common name is Sandfood, but its scientific

name is Pholisma sonorae. Sandfood is a very rare flowering plant that grows in the deserts

of the western US. Only the plant's inflorescence, or flower, is visible above the sand level,

and its stems grows underground. This stem can be up to 6 feet, or 2 meters, long and

it reaches down through the ground to graft onto the root systems of neighboring shrubs.

This plant also does not have chlorophyll, as you can tell from this picture, it is not

green at all. This means it is also a holoparasite like the Albino Redwood.

Thank you for watching this quick video about parasitic plants. For more botanical content,

check out www.brilliantbotany.com. Don't forget to like and subscribe, thank you so much for