{"id":1169,"date":"2020-02-20T12:23:27","date_gmt":"2020-02-20T12:23:27","guid":{"rendered":"http:\/\/horizon.peachpuff-wolverine-566518.hostingersite.com\/?p=1169"},"modified":"2020-02-20T12:24:33","modified_gmt":"2020-02-20T12:24:33","slug":"plants-can-detect-insect-attacks-by-sniffing-each-others-aromas","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/horizon\/1169\/plants-can-detect-insect-attacks-by-sniffing-each-others-aromas\/","title":{"rendered":"Plants can detect insect attacks by ‘sniffing’ each other’s aromas"},"content":{"rendered":"
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Fragrant aromas from plants can actually be a response to attacks by insects, and can alert neighbours to an attack or summon the insects\u2019 predators. Now, scientists are deciphering these secret codes to develop better, greener chemicals to defend crops against herbivorous insects.<\/strong><\/h3>\n<\/div>\n<\/div>\n<\/div>\n
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Plants have nowhere to run from their enemies – flying, crawling and jumping insects want to eat them alive. But plants are not defenceless. They deploy chemical toxins to deter insects. These can make the plant taste bitter, inhibit the herbivore\u2019s digestive enzymes, disrupt their metabolism or poison them.<\/p>\n

But they have a more subtle defence too – perfumed chemical compounds, known as volatiles, that they emit into the air to warn neighbours of danger or convey when they\u2019re hurt.\u00a0An example is the smell of cut grass, a mix of molecules called \u2018green leaf volatiles\u2019 which are released when a plant is damaged.<\/p>\n

\u2018Plants are nature\u2019s chemists. They take a few simple inorganic molecules and produce thousands of different organic molecules by just adding (energy from) sunlight,\u2019 said\u00a0Professor Matthias Erb<\/a>, a plant scientist at the University of Bern, Switzerland. He investigates\u00a0the volatiles that plants emit when attacked by insects for a project called\u00a0PERVOL<\/a>.<\/p>\n

\u2018Some of these volatiles attract natural enemies of the herbivore, so, friends of the plant,\u2019 said Prof. Erb. For example, if a caterpillar attacks a plant, these volatiles may attract parasitoid wasps or trigger defence responses in neighbouring plants.\u00a0He says plants don\u2019t help one another by signaling \u2018I\u2019m under attack\u2019. Rather, they snoop on one another\u2019s chemical signals to warn themselves about imminent threats.<\/p>\n

Insects<\/strong><\/p>\n

Decoding these signals could teach us how to better protect crops against insects, according to Prof. Erb.<\/p>\n

Insects are responsible for destroying\u00a0one-fifth of the world\u2019s total crop production<\/a>\u00a0each year.\u00a0This is predicted to rise further<\/a>\u00a0for grain crops with climate change, hitting the temperate zones hardest.<\/p>\n

\u2018These (plant-derived) molecules can be useful for agriculture in that they are natural protective mechanisms of plants. We could use them instead of synthetic chemicals,\u2019 he said.<\/p>\n

Prof. Erb works with maize, a strong emitter of volatiles. One chemical it emits is indole, which has a pleasant flowery aroma in small concentrations. Indole is not released by cutting maize. It requires the presence of a molecule in moth caterpillar saliva that activates defence responses in the plant. \u2018(Healthy) maize plants do not emit indole. It is only triggered by herbivory,\u2019 he said.<\/p>\n

Prof. Erb and his colleagues found that when indole wafts towards the part of the plant that is not under attack, it triggers what he calls a primed state. \u2018(Indole) doesn\u2019t induce a defence response, but it prepares the plant, so that when the plant is attacked by a herbivore, it will respond quicker and stronger,\u2019 he said.<\/p>\n

Doing this means it can fend off its attacker more effectively, he says.<\/p>\n

One limitation of indole, however, is that it is also released by some flowers, such as jasmine and orange blossom. To prevent confusion, as a single volatile might be misleading, maize plants often tune into chemical mixtures to deduce attacks.<\/p>\n

\u2018We have shown that indole and green leaf volatiles act synergistically to induce defences in an even stronger fashion than an individual volatile,\u2019 said Prof. Erb.<\/p>\n

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\u2018Plants are nature\u2019s chemists. They take a few simple inorganic molecules and produce thousands of different organic molecules by just adding sunlight.\u2019<\/p>\n

Professor Matthias Erb, University of Bern, Switzerland<\/p>\n<\/blockquote>\n<\/div>\n

Compound<\/strong><\/p>\n

To paint a fuller picture of plant behaviour, scientists are also exploring the impact of insect saliva on green leaf volatiles.<\/p>\n

This is something that Dr\u00a0Silke Allmann<\/a>\u00a0at the University of Amsterdam in the Netherlands has investigated in her work looking at how the green leaf volatiles of hurt plants is perceived by both plants and insects.<\/p>\n

She experimented on tobacco plants by mechanically cutting them and applying water or the saliva of a tobacco hornworm caterpillar. The results surprised her: overall, the amount of green leaf volatiles did not change much, but the composition of the volatiles shifted dramatically. An enzyme in the caterpillar\u2019s spit changed the compound, causing it to shift from a grassy to a sweet smell.<\/p>\n

She then discovered that a shift to the sweet-smelling compound\u00a0attracted big-eyed bugs,<\/a>\u00a0which are natural enemies of the hornworm caterpillar, to the tobacco plant. This seemed puzzling to Dr Allmann, as the caterpillar\u2019s own enzyme helped alert its presence to its enemies.<\/p>\n

However, the sweet smell also warned adult tobacco hawk moths that a tobacco plant had already been colonised by caterpillars and steered them towards those with fewer competitors and\u00a0fewer predators.<\/p>\n

Dr Allmann is now studying this compound further as part of a project called\u00a0VOLARE<\/a>, and exploring practical uses.<\/p>\n

\u2018A big challenge with plant volatiles is finding applications in agriculture. That is the holy grail,\u2019 said Dr Allmann.<\/p>\n

These chemicals can help farmers in a greener way, say the scientists.<\/p>\n

\u2018You could imagine applying plant volatiles at the right moment to trigger specific reactions in a plant, for instance, resistance to herbivory,\u2019 said Prof. \u2018That would be a far more environmentally friendly strategy of boosting plant immunity or resistance to stress than applying a bioactive chemical to kill insects.\u2019<\/p>\n

Such natural chemicals could be released into fields under threat from pests to activate plant defences at the right moment. Insights into how plants detect warning smells could also allow breeders to develop crop varieties that are responsive to the signals.<\/p>\n

Nose<\/strong><\/p>\n

What remains puzzling for scientists is how plants sniff out volatiles in the first place. They don\u2019t have noses like us but can smell.<\/p>\n

\u2018Our hypothesis is that volatiles enter through the stomata, small pores in leaves. We expect that there are sensors inside the leaf, perhaps proteins on the surface of cells, that the volatiles bind to,\u2019 said Prof. Erb.<\/p>\n

Dr Allmann is also hunting for these sensors. \u2018If we found these receptors, we could find ligands (a type of molecule) that bind to them and switch them on. We could perhaps breed plants to be more or less sensitive to volatiles,\u2019 she said. Plants could be bred that are easily triggered and could serve as sentinels to warn other plants nearby.<\/p>\n

The research in this article has been funded by the EU’s European Research Council. <\/em><\/p>\n

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

Fragrant aromas from plants can actually be a response to attacks by insects, and can alert neighbours to an attack or summon the insects\u2019 predators. Now, scientists are deciphering these secret codes to develop better, greener chemicals to defend crops against herbivorous insects. Plants have nowhere to run from their enemies – flying, crawling and … Read more<\/a><\/p>\n","protected":false},"author":320,"featured_media":1170,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","_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":"","jetpack_post_was_ever_published":false},"categories":[11],"tags":[],"class_list":["post-1169","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earth-energy-environment"],"yoast_head":"\nPlants can detect insect attacks by 'sniffing' each other's aromas - 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\/1169\/plants-can-detect-insect-attacks-by-sniffing-each-others-aromas\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Plants can detect insect attacks by 'sniffing' each other's aromas\" \/>\n<meta property=\"og:description\" content=\"Fragrant aromas from plants can actually be a response to attacks by insects, and can alert neighbours to an attack or summon the insects\u2019 predators. 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