HOME >> BIOLOGY >> NEWS
Signal chemical primes plants for pest attack

Physically damaged or chewed plants produce a volatile chemical that may serve as a primer to prepare nearby plants to defend themselves against insect attack, according to a team of researchers.

"We know that when caterpillars chew on plants, eventually the plants produce chemicals attracting wasps that are the natural enemy of the caterpillar," says Dr. James H. Tumlinson, the Ralph O. Mumma endowed professor of entomology at Penn State. "Natural predators can be an effective method of biological control of pests in agriculture."

However, these predator attracting chemicals do not appear immediately. The first chemicals released are green leafy volatiles (GLV), the odor of new mown grass or crushed leaves. These are highly volatile and appear immediately so they are good candidates as signals to other plants.

To explore this, Tumlinson, working at the Center for Medical, Agricultural and Veterinary Entomology, Agricultural Research Service, U.S. Department of Agriculture, Gainesville, Fl., looked at how GLV influenced undamaged plants in the area by studying corn seedlings and beet army worm, a caterpillar that eats corn leaves as well as cotton, tobacco and other plants. The researchers exposed seedlings to GLV for an hour or overnight. They then tested the undamaged plants by either mechanically damaging them or mechanically damaging them and applying beet armyworm spit to the wounds.

"We discovered that . . . exposure to GLV primed corn plant defenses to respond more strongly against subsequent attack by herbivorous insects by increasing jasmonic acid biosynthesis and volatile organic compounds (VOC)," the researchers report in the current issue of the Proceedings of the National Academy of Science.

Jasmonic acid is a plant hormone that turns on plant defenses, including VOCs, which are the chemicals that attract the caterpillar's parasites and predators. They usually do not appear until hours after the init
'"/>

Contact: A'ndrea Elyse Messer
aem1@psu.edu
814-865-9481
Penn State
26-Jan-2004


Page: 1 2 3

Related biology news :

1. Epilepsy: Signals brake in brain impaired
2. Reproductive Signals Affect Lifespan In Roundworm C. Elegans, Offering Possible Insight Into Human Aging Process
3. A Versatile Signal In Vertebrate Embryogenesis: Wnt-4 Regulates Kidney Development, Sex Organ Differentiation, Neuronal Survival And Axonal Guidance
4. Small G-Proteins Make A Big Difference -- Nerve Cell Signalling Is Regulated By Arf-GTPases And Their Activators
5. How Nerve Cells Get In Touch - A Molecular Model Of Synapse Formation And Retrograde Signalling In The Brain
6. Cell Suicide Prevented By Survival Signals
7. Plant-Based Fat Inhibits Cancer-Cell Growth By Enhancing Cells Signaling System, UB Researchers Show
8. Toxic Protein That Interferes With Brain Signals May Trigger Onset Of Alzheimers Disease
9. R-Type Channels - A New Type Of Calcium Channels Controlling Signal Transduction Between Neurons In The Brain
10. Cholesterol Anchor Helps Signaling Proteins Direct Development
11. DNA lends scientists a hand, revealing new chemical reactions

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/27/2016)... 2016 Research and Markets has announced the ... report to their offering. The ... to grow at a CAGR of 12.28% during the period ... an in-depth market analysis with inputs from industry experts. The report ... years. The report also includes a discussion of the key vendors ...
(Date:6/22/2016)... 2016   Acuant , the leading ... has partnered with RightCrowd ® to ... Management, Self-Service Kiosks and Continuous Workforce Assurance. ... functional enhancements to existing physical access control ... with an automated ID verification and authentication ...
(Date:6/21/2016)... , June 21, 2016 NuData ... the new role of principal product architect and ... the director of customer development. Both will report ... technical officer. The moves reflect NuData,s strategic growth ... response to high customer demand and customer focus ...
Breaking Biology News(10 mins):
(Date:12/2/2016)... Antonio Texas (PRWEB) , ... ... ... today that it will share findings demonstrating the value of DNA microarray ... patients at this year’s San Antonio Breast Cancer Symposium. Using molecular test ...
(Date:12/2/2016)... ... December 01, 2016 , ... DrugDev believes the ... and a beautiful technology experience. All three tenets were on display at the 2nd ... leaders from over 40 sponsor, CRO and site organizations to discuss innovation and the ...
(Date:12/2/2016)... 2016   SurePure, Inc. (OTCQB: SURP) a ... Company has concluded an agreement with Tamarack Biotics under ... period to acquire units of the Company,s patented photopurification ... million.  Concurrently with the option, SurePure ... Tamarack will seek regulatory approvals in the ...
(Date:11/30/2016)... -- GenomOncology today announced the appointment of Joshua F. Coleman ... Dr. Coleman will oversee clinical content development and curation ... GenomOncology software suite empowers molecular pathologists with a seamless workflow ... support, from quality control through reporting. ... , , ...
Breaking Biology Technology:
Cached News: