{"id":503,"date":"2018-10-16T09:54:20","date_gmt":"2018-10-16T09:54:20","guid":{"rendered":"http:\/\/horizon.peachpuff-wolverine-566518.hostingersite.com\/?p=503"},"modified":"2018-10-16T09:54:20","modified_gmt":"2018-10-16T09:54:20","slug":"root-architecture-discoveries-could-help-breed-drought-resistant-crops","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/horizon\/503\/root-architecture-discoveries-could-help-breed-drought-resistant-crops\/","title":{"rendered":"Root architecture discoveries could help breed drought-resistant crops"},"content":{"rendered":"

We should breed new varieties of crops based on their root architecture rather than just focusing on the top half of the plant, according to scientists looking at how to cultivate plants that use water more efficiently and better withstand drought conditions.<\/strong><\/h3>\n
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Yellow, parched fields were a common sight in Europe this summer. The severe 2018 drought caused damage to wheat, maize and barley crops, with\u00a0harvests down in many EU countries<\/a>. And climate scientists predict that European crops will suffer from more frequent and extreme heat in the coming years.<\/p>\n

The most visible signs of heat stress and water shortages are seen in leaves, but plant scientists have begun looking for solutions in \u2018the hidden half\u2019 \u2013 the roots.<\/p>\n

\u2018You could argue that for the last 10,000 years, we have selected crop varieties on the basis of the upper half, and not focused on this hidden part of crops,\u2019 said Malcolm Bennett, professor of plant science at the University of Nottingham, UK. \u2018If we could select new crop varieties based on root architecture, we could significantly improve their ability to forage for water.\u2019<\/p>\n

Roots absorb water and nutrients from soil and store food for the plant. Deeper rooting cereal crops could suck up water from further underground, or dense shallow roots might better capture nutrients like phosphorus that gather at the surface.<\/p>\n

Plants can have a similar biomass of roots to the part that is above ground – the challenge is how to see living roots in order to analyse them.<\/p>\n

Prof. Bennett has found a solution. He now scans roots growing through soil using X-ray micro-computed tomography (micro CT), the same technology routinely used by doctors to see inside patients. His machine, though, is a colossus, three to four times bigger than a typical medical scanner and a one-of-a-kind in Europe for life sciences.<\/p>\n

It\u2019s so big that a new building \u2013 the\u00a0Hounsfield Facility<\/a>\u00a0\u2013 was constructed to house the giant scanner, which is encased in 20 tonnes of lead. A heavy-lifting robot installed it onto a specially reinforced floor.\u00a0 \u2018Scanners (of this size) are normally used in the car and aerospace industries, where they are used to scan engine and wing parts for faults,\u2019 Prof. Bennett explained. \u2018Ours allows us (to) image living roots.\u2019<\/p>\n

The researchers grow wheat in one-metre high PVC plastic tubes, and then image their roots throughout their life span. Over 8,000 X-ray snaps are taken and computer algorithms stitch these sections together to create a\u00a03-D image of roots<\/a>\u00a0growing in soil at a single point in time. Because plants can withstand more X-ray power than humans, the resolution is much higher and can reveal even the thinnest of root hairs. Scanning can be done repeatedly to image the growth of roots.<\/p>\n

Thirst<\/strong><\/p>\n

Through a project called\u00a0<\/strong>FUTUREROOTS<\/a>\u00a0Prof. Bennett\u2019s group has scanned hundreds of varieties of wheat to see how they respond to thirst. They compared those excellent at using limited water with those that are poor.<\/p>\n

\u2018We noted something fascinating. Plants that were most efficient at using water changed the angle of their roots when you applied drought stress,\u2019 said Prof. Bennett. \u2018Steeper rooting angles allowed them to forage for deeper sources of water.\u2019<\/p>\n

With US and Chinese collaborators, Prof. Bennett has recently identified master genes that control root angle in maize and rice.<\/p>\n

This may sound trivial, but it matters hugely for food production. In the UK, for example, most cereals like wheat are grown in the east of the country, which receives less rain and suffered water shortages this summer.<\/p>\n

\u2018To maintain wheat yields here (in the UK), we need to have new varieties with roots that grow an extra half metre at least,\u2019 Prof. Bennett explained. Other parts of Europe are similarly concerned about water shortages and its effect on crops.<\/p>\n

Breeding crops with better root systems could also lower the amount of nitrogen fertiliser applied by farmers. Nitrogen is expensive and excess nitrogen runs off and pollutes rivers and lakes, so improved roots could lower costs for farmers while helping the environment. A win-win.<\/p>\n

\u2018We could optimise crop root systems to take up nutrients more efficiently, such as selecting deeper rooting varieties to capture nitrogen as it moves deeper into soil,\u2019 said Prof Bennett. \u2018The idea of selecting new varieties based on root architecture is gaining support amongst breeding companies and researchers.\u2019<\/p>\n

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‘Plants that were most efficient at using water changed the angle of their roots when you applied drought stress.’<\/p>\n

Professor Malcolm Bennett, University of Nottingham, UK<\/p>\n<\/blockquote>\n<\/div>\n

Studying the roots of weeds can also give insight into how to breed more resilient crops. Plant scientists in France recently scrutinised a little weed called\u00a0Arabidopsis,\u00a0<\/em>commonly known as Thale cress, to better understand the way roots make best use of scarce water.\u00a0Arabidopsis\u00a0<\/em>is the plant most popular in research, a sort of lab mouse in the plant world, and their project\u00a0DROUGHTROOT<\/a>\u00a0studied root architecture, plant hormones and special water channel proteins in cells known as aquaporins.<\/p>\n

The Montpellier-based scientists discovered that plants have a plan A and plan B for a lack of water.\u00a0 \u2018One strategy is to grow more roots and better take up water, but under severe drought the plants takes an alternative strategy. It downregulates its root hydraulic system and tries to protect itself from dehydration,\u2019 explained project coordinator Dr Christophe Maurel, plant scientist at the National Center for Scientific Research (CNRS). This research, for which Dr Maurel is preparing a manuscript for publication, unearthed genes, proteins and hormones that contribute to a plant\u2019s response to drought.<\/p>\n

Drought<\/strong><\/p>\n

Dr Maurel is now taking these lessons from the lab weed and applying them to a major crop \u2013 maize.\u00a0 Maize is an economically important crop in Europe, and is grown especially in France, northern Italy, Germany and Eastern Europe. It can be susceptible to drought in Europe because it flowers in summer, unlike wheat, which flowers earlier.<\/p>\n

Dr Maurel is studying the growth of this crop\u2019s roots and the genes behind its response to drought in a project called\u00a0HyArchi<\/a>, which he hopes will serve up knowledge that will help crop breeders develop plants, or cultivars, better suited to drought conditions in specific regions.<\/p>\n

\u2018We\u2019ve been able to measure the performance of different maize cultivars. We see some nice differences and we see genetic variability in root hydraulics. This is important and makes me optimistic that we can take advantage of its genetics (to breed new varieties),\u2019 Dr Maurel said.<\/p>\n

In September, the group reported\u00a0that they had found a master gene<\/a>\u00a0in\u00a0Arabidopsis\u00a0<\/em>involved in making the vessels that transport water inside roots. Tweaking this gene boosted the number of vessels. This could be good news for drought conditions. But there was a catch.<\/p>\n

\u2018The more vessels at the root tips, the more susceptible they were to invasion by soil bacteria,\u2019 Dr Maurel said, meaning there is a trade-off between a better ability to withstand drought and vulnerability to infection.<\/p>\n

Dr Maurel points out that this type of fundamental research takes a long-term view. \u2018We might help breeders not in five years, but maybe 10 to 20 years,\u2019 he said. \u2018Anyway, in 10 to 20 years we will be facing even stronger challenges with drought and climate change.\u2019<\/p>\n

Originally published on\u00a0<\/em>Horizon<\/em><\/a>.<\/em><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

We should breed new varieties of crops based on their root architecture rather than just focusing on the top half of the plant, according to scientists looking at how to cultivate plants that use water more efficiently and better withstand drought conditions. Yellow, parched fields were a common sight in Europe this summer. The severe … Read more<\/a><\/p>\n","protected":false},"author":320,"featured_media":504,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[11],"tags":[2,126,4,44,79,24],"class_list":["post-503","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earth-energy-environment","tag-agriculture","tag-climate-change","tag-environment","tag-food","tag-research","tag-science"],"yoast_head":"\nRoot architecture discoveries could help breed drought-resistant crops - Horizon Magazine Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/horizon\/503\/root-architecture-discoveries-could-help-breed-drought-resistant-crops\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Root architecture discoveries could help breed drought-resistant crops\" \/>\n<meta property=\"og:description\" content=\"We should breed new varieties of crops based on their root architecture rather than just focusing on the top half of the plant, according to scientists looking at how to cultivate plants that use water more efficiently and better withstand drought conditions. 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