Talking Plants


Maneka Gandhi


(Bihar Times) I shudder when I see cut flowers or anyone idly plucking leaves. We don’t mow the grass in my house and it behaves beautifully. For me, people who keep bonsais are the equivalent of butchers. When you understand that a plant is a stationary but equally sensitive being, you’ll probably stop ill treating it too.

After ten years of studying all the experiments on plants, Australian scientists have established that plants have human-like attributes. Venus Fly Traps and Mimosa plants can move, pitcher plants eat animals while peaches and cherries calculate the number of cold days each year before sprouting leaves in the spring. They even talk to each other and call in reinforcements when the going gets tough.

In fact, the landscape around us is filled with chatter. Plants exchange information with each other, and with insect pollinators, seed dispersers, herbivores and enemies of those herbivores. Biologists use chemical sensors, to decode these odour molecules denoting cries for help, invitations, warnings et al that float past human noses unnoticed. They have discovered that plants use chemical cues to repel predators and attract allies i.e those insects that feed on the insects that feed on the plant. They have also found that neighbouring plants pick up these conversations and gear up their own defenses.

A must read book, The Secret Life of Plants, had earlier introduced the idea of humans talking to philodendrons. Now we learn that the philodendrons talk back. Researchers have documented maple, willow, poplar, alder and birch trees listening to their own kind. Even barley seedlings listen to other barley seedlings. Plants like strawberry, clover, reed and ground elder form internal communication networks for efficient information exchange with individual plants connected by means of runners in a manner similar to computer networks.
So what do plants talk about?
One study found that clover plants use these network lines to warn each other when an enemy approaches. For example, a plant attacked by caterpillars will alert all other members of the network. These will then activate their protective mechanisms and trigger chemical and structural changes to render their leaves less tasty and harder to bite. Even unrelated plants pick up chemical alarms. For example, cucumbers respond to the signals of injured lima beans.

Dutch scientists offer evidence that plants under attack enlist the help of their enemy’s enemy. When spider mites attack lima bean plants, the plants release a chemical SOS that summons the mite that preys on the spider mite.. Similarly, when caterpillars descend on corn, tobacco, and cotton, the beleaguered plants release chemicals to attract parasitic wasps. So specific are these signals that they attract only those wasps that lay their eggs on the type of caterpillar infesting the plant. "Plants don’t just say, 'I am damaged,' they also specify who is damaging them," avers Professor Consuelo De Moraes of Pennsylvania State University. Distress signals from mite-infested cotton and lima beans prompt undamaged plants to send out pre-emptive calls to enemies of the infesting mite. Today scientists agree that plants talking to bodyguards is a characteristic of most, if not all, plant species .
Plants time their signals to reach their intended audience. Parasitic wasps hunt during the day so that's when infested plants will release an SOS directed at them. At night, tobacco plants release a chemical concoction that discourages nocturnal moths from laying eggs that produce tobacco-devouring caterpillars.

Because they require especially strong survival skills, tobacco plants are a favourite subject of study. Their seeds can lie dormant for a century so once they start growing , they may face unfamiliar enemies. Moreover, after germination, they have only one season to flower and reproduce. So the plant has to optimize growth, and repel predators whilst creating seeds. Successful seedlings must fend off the caterpillars of hawkmoths, leaf bugs, flea beetles, and mirids. One study placed a hungry caterpillar on several plants. It found that when a caterpillar bites into a leaf, the plant identifies the insect's saliva and initiates a chemical defense. Some plants produce toxins like nicotine to kill the insect , others produce compounds that slow down or arrest the invader's ability to digest the plant. Should these fail, the plant releases airborne chemical repellants. If still, an insect like the hawkmoth settles down on it to lay eggs, the plant summons Geocoris pallens, a small, fast, and rapacious predator of hawkmoth eggs. Through chemical emissions, a plant can reduce insect attack by upto 90 %!

Kyoto University researchers found an additional warning that endangered plants emit. They specifically alert relatives and clones (genetically identical cuttings) growing nearby, proving that plants recognize kin. A sagebrush plant can recognize a genetically identical cutting close by, and the two clones communicate and cooperate to avoid being targeted by herbivores. Researchers speculate that plants identify themselves through their roots using tiny chemical signatures specific to each family. Root systems grow differently depending on whether they bump into themselves or a neighbour’s and whether that neighbor belongs to a local or distant community. Flowers of many species can tell their own pollen from that of another.

Family feeling in plants was first demonstrated by a Canadian study. When plants of the same species but strangers are potted together, each extends its root growth to monopolize soil and water. But siblings from the same mother plant allow each other ample root space, and planted together grow taller and stronger.

Plants calculate the length of days, using that information to decide when to flower. Daffodils bloom in spring as the days get longer. Roses wait until summer. Rice flowers choose autumn as the days shorten. Years ago, Russian scientists speculated about a substance being transported from the leaves to shoot tips, stimulating the formation of flower buds. They named this mystery chemical "florigen." Now research reveals that a gene called FT, whose activity is regulated by day length, produces a messenger molecule that is sent to the shoot tip to talk to proteins that exist at the future locations of buds so that flowers are born at just the right time.

Under stress, plants react just like humans, seeking relief from an aspirin-like mix of chemicals which they produce. Colorado scientists have found methyl salicylate, the chemical form of aspirin is emitted into the atmosphere as plants respond to drought, unseasonable temperatures and other stresses. Methyl salicylate has two functions. One is to build up the plant’s own immunity levels to resist and recover from disease. The second is to communicate the threat to neighboring plants. The methyl salicylate that accumulates in the atmosphere above a stressed forest activates the immune responses of plants even faraway.

How wondrous it would be to understand plant language. I only hope it happens before we destroy all of them and ourselves.

To join the animal welfare movement contact gandhim@nic.in


previous articles...

Talking Plants

Altruism in Animals

Music Soothes Animals

How Animals recognize their Kins

Animals teach their offspring like human moms

Cruelty to Animals in Slaughter houses

What is the secret to a perfect life and happiness?

How is Ghee being adulterated ?

Difference between a man & an animal

Homosexuality Is Not Against Nature In Animal Kingdom

Programmes for improving Animal Welfare

Promiscuity in mating behaviour of Birds

Uses for slaughtered Animals accelerate killing of Animals

Slingshots & Catapults Destroy Wild Life

Human Intelligibility of Animals

Animal grooming of offspring is worth emulating

Illegal Trade of Killing Cattle

Eating Cattle Meat Causes E Coli Infection

Some tips on making  Puppies’ life comfortable

Some tips on keeping kittens clean

Snake skin trade dangerous for eco system

Dog shows are not for dog lovers but for moneymakers and charlatans

Political agenda for Animal welfare needed

How foolish it is to kill Sea creatures for Ornaments

Infectious diseases from Animals to Humans

How pitiable is Rabbit farming?

Remedies for Animal ailments

Infected Pig Meat Risks Your Life

Animals spread dangerous Ebola virus to humans

Animals Have More Sense

Municipal Policy on hazards of pet shops

Mutualism  makes Species of the nature flourish

Adoption Fair for Puppies

How Animals behave in packs

Why People prefer dogs and cats to human beings

Positive effects of spaying and neutering on pets

Mammals & Birds cry like human beings

Biomemetics Provides solution to human problems

Chinese food products- the greatest killer

Pets make better partners than humans

How harmful is the Packaged Meat

Stop Slaughter of Cows for Bone Trade

How cruel it is to dump pet animals ? view comments...

Don’t hurt animals on festive occasions

Let the earth beings survive

Glues are made of animal remains

Meat increases risk of cancer

Birds provide springboard to song composers

Is it not an act of Cannibalism?

How many animals do you have to eat before you become man ?

To eat or not to eat Meat

Insulin from Animals 

Is It Healthy Decision to Promote Rat Eating in Bihar

Use of Animal bones in Porcelain

Infection of Tick disease in Dogs and its cure

Vegetarian diet is the best diet for human beings

Non-Veg  Diet causes  Dementia

Excuses for being non-vegetarians

Body odour of Non-vegetarians

Feeling Good

MEAT threatens Planet’s Survival

Am I smarter than you ? Yes, if you are a meat eater.

Need to  orient educational system to deal with animals

How to Avoid Cruelty to Gold Fish?

How To Make Everyday An Animal day

Are Eggs Vegetarian?

Are You One of these People ?

Use of Animal Fats in Cosmetics Industries

Killing of endangered Species for Perfume Industries

Missionary Campaign to Control Cruelty to Animals- needed

Drink Milk, Get Sick

Parents Create Monsters

The Business of Murder:Factory Farming and the Meat Industry in India

Effect of landscaping of birds on environment

Dangers of killing deep Sea-Sharks for  Cosmetic Products

Use of dog in diagnosis of diseases

Sacred Nature of Neelkanth

Cruelty to Polo Ponies comments...

Self-Regulation of Population by Animals

Dangers of Animal meat eating

Arsenic poison in chicken feed

Cruelty to Animals by Govt. Vets

Worship of God with Blood and Suffering of Animals and Birds

Consequences of Chloramphenicol in Shrimp Industry

Hazards of Trade in Peacocks’ Feather

Supreme Court Ban on cruelty to Animals

Are you a Bad Pet Owner?

The Goat That Laughed and Wept

Animal Owners’ personality traits resemble their Pets’

Human Propensities of Goat

Animal sacrifice at the altar of religion

Animal as foster parent

Animal feed from rendering plant

Trade in WildLife

Human Intelligence of Birds

Human Propensities of Cow