Jonathan Drori: Why we're storing billions of seeds

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【話題】 タネを保存する理由

【時間】 6分38秒

【要約】

１．すべての生命は植物に依存している

　日々の生活、文化、環境、生産基盤
　突き詰めると最後は植物に依存

２．植物は危機にある

　気候変動や人間の活動によって

３．どうやって植物を保護するか

　種子を保存しておく（種子銀行）

　タネの中にすべての情報が詰まっている

　イギリス南部だけではなく、世界中に

　まず最も危機に瀕している種（乾燥地域の種）

　世界50カ国、120の機関と提携

　袋に詰め込み乾燥、低温、低湿度の中で貯蔵

　数千年後、数百年後なら間違いなく発芽することが可能

　10年ごとに発芽テストを行い、発芽のノウハウも習得・共有

４．現状

　①30億個の種子が貯蔵されている

　　地球上の全植物の10％に当たる24,000種

　　来年までに30,000種

　　2020年までに世界の全植物の25％

　②農業用だけではない

　　干ばつに強い森林植物のタネ

　　光合成能力の高い植物のタネ

　　塩分に強い牧草のタネ

　③世界中でトレーニングが行われている

５．費用

　一種あたり平均2800ドル

６．将来の展望

　10年ごとの発芽テストをしなくても済むように、
　タネの生存能力に関わる遺伝子を発見することが次の目標

【語彙】

convince ：説得する

provision ：供給

regulating ：制御

under threat ：脅威にさらされる

distribute ：広める、分配する

nuclear proof facitlity ：原子力発電に依存していないという意味

withstand ：耐える

tag ：タグをつける

viable ：生存能力がある

germination ：発芽

protocol ：手順

drought-tolerant ：干ばつ耐性のある

photosynthetic-efficient ：光合成効率の高い

salt-tolerant ：塩害耐性のある

pasture ：牧草地

restoration ：復元

【transcript】

All human life, all life, depends on plants. Let me try to convince you of that in a few seconds. Just think for a moment. It doesn't matter whether you live in a small African village, or you live in a big city, everything comes back to plants in the end: whether it's for the food, the medicine, the fuel, the construction, the clothing, all the obvious things; or whether it's for the spiritual and recreational things that matter to us so much; or whether it's soil formation, or the effect on he atmosphere, or primary production. Damn it, even the books here are made out of plants. All these things, they come back to plants. And without them we wouldn't be here.

Now plants are under threat. They're under threat because of changing climate. And they are also under threat because they are sharing a planet with people like us. And people like us want to do things that destroy plants, and their habitats. And whether that's because of food production, or because of the introduction of alien plants into places that they really oughtn't be, or because of habitats being used for other purposes -- all these things are meaning that plants have to adapt, or die, or move. And plants sometimes find it rather difficult to move because there might be cities and other things in the way.

So if all human life depends on plants, doesn't it make sense that perhaps we should try to save them? I think it does. And I want to tell you about a project to save plants. And the way that you save plants is by storing seeds. Because seeds, in all their diverse glory, are plants' futures. All the genetic information for future generations of plants are held in seeds. So here is the building; it looks rather unassuming, really. But it goes down below ground many stories. And it's the largest seed bank in the world. It exists not only in southern England, but distributed around the world. I'll come to that. This is a nuclear-proof facility. God forbid that it should have to withstand that.

So if you're going to build a seed bank, you have to decide what you're going to store in it. Right? And we decided that what we want to store first of all, are the species that are most under threat. And those are the dry land species. So first of all we did deals with 50 different

countries. It means negotiating with heads of state, and with secretaries of state in 50 countries to sign treaties. We have 120 partner institutions all over the world, in all those countries colored orange. People come from all over the world to learn, and then they go away and plan exactly how they're going to collect these seeds. They have thousands of people all over the world tagging places where those plants are said to exist. They search for them. They find them in flower. And they go back when their seeds have arrived. And they collect the seeds. All over the world.

The seeds -- some of if is very untechnical. You kind of shovel them all in to bags and dry them off. You label them. You do some high-tech things here and there, some low-tech things here and there. And the main thing is that you have to dry them very carefully, at low temperature.

And then you have to store them at about minus 20 degrees C -- that's about minus four Fahrenheit, I think -- with a very critically low moisture content. And these seeds will be able to germinate, we believe, with many of the species, in thousands of years, and certainly in

hundreds of years.

It's no good storing the seeds if you don't know they're still viable. So every 10 years we do germination tests on every sample of seeds that we have. And this is a distributed network. So all around the world people are doing the same thing. And that enables us to develop germination protocols. That means that we know the right combination of heat and cold and the cycles that you have to get to make the seed germinate. And that is very useful information. And then we grow these things, and we tell people, back in the countries where these seeds have come from, "Look, actually we're not just storing this to get the seeds later, but we can give you this information about how to germinate these difficult plants." And that's already happening.

So where have we got to? I am pleased to unveil that our three billionth seed -- that's three thousand millionth seed -- is now stored. Ten percent of all plant species on the planet, 24,000 species are safe; 30,000 species, if we get the funding, by next year. Twenty-five percent

of all the world's plants, by 2020. These are not just crop plants, as you might have seen stored in Svalbard in Norway -- fantastic work there. This is at least 100 times bigger. We have thousands of collections that have been sent out all over the world: drought-tolerant forest species sent to Pakistan and Egypt; especially photosynthetic-efficient plants come here to the United States; salt-tolerant pasture species sent to Australia; the list goes on and on.

These seeds are used for restoration. So in habitats that have already been damaged, like the tall grass prairie here in the USA, or in mined land in various countries, restoration is already happening because of these species -- and because of this collection. Some of these plants,

like the ones on the bottom to the left of your screen, they are down to the last few remaining members. The one where the guy is collecting seeds there on the truck, that is down to about 30 last remaining trees. Fantastically useful plant, both for protein and for medicine. We have training going on in China, in the USA, and many other countries. How much does it cost? 2,800 dollars per species is the average. I think that's cheap, at the price. And that gets you all the scientific data that goes with it. The future research is "How can we find the genetic and molecular markers for the viability of seeds, without having to plant them every 10 years?" And we're almost there.

Thank you very much.

ジョナサン・ドロリ 「種子を保存する理由」

ジョナサン・ドロリ「種子を保存する理由」