Navigation Links
Ethylene of no effect - why peppers do not mature after picking
Date:8/3/2012

This press release is available in German.

Tomato breeders scored a coup several years ago when they identified tomatoes with a genetic defect that made the fruits mature very slowly, even under the influence of the phytohormone ethylene. Traders and growers were delighted as it gave them more time to transport the crop, initially still green, from where it was harvested to where it would be sold. At the stores, the tomatoes could then be treated with ethylene to bring them to maturity. Other fruits, like peppers, grapes and strawberries, generally do not mature after picking; they need to be harvested when ripe and consumed as soon as possible. Scientists from the Max Planck Institute of Molecular Plant Physiology in Potsdam investigated why ethylene causes some plants to mature after picking and has absolutely no effect on others.

In order to make it easier to compare the metabolism and the gene expression level of climacteric and non-climacteric plants, the scientists concentrated their work on two closely related species: the climacteric tomato and the non-climacteric habanero chilli pepper, both of the nightshade family. The team studied the plant metabolism at different times of day, before and after the so-called breaker point, the day on which the fruit begins ripening, as evidenced by a visible change of colour.

What happens with tomatoes is that on this very day they release huge quantities of ethylene, experiencing what is known as "ethylene shock". The gaseous phytohormone ethylene activates its own synthesis as soon as the plant comes into external contact with ethylene. That is why green bananas turn yellow quicker when they are stored next to apples, as apples represent an excellent source of ethylene.

Two enzymes are instrumental in the synthesis of ethylene. These are called ACC synthase and ACC oxidase. During the ripening process, climacteric tomato fruits produce much more of these enzymes, which causes ethylene levels to rise continuously. The ethylene then sets a cascade of signals in motion in the tomatoes, causing the fruits to ripen. Green chloroplasts convert to colourful chromoplasts, the hard cell wall components break down, sugars are formed and the nutrient content changes.

This is not the case with the chillis. "It looks like the ethylene has absolutely no influence on the gene expression or the metabolism of habenero chilli peppers," says group leader Alisdair Fernie, who studied the fruits' metabolism and gene activity with his team. Surprisingly, though, genes lower down the ethylene signal chain showed heightened levels of activity. "The genes for breaking down the plant cell wall or the carotenoid biosynthesis during the plant's normal process of ripening were produced in greater quantities in the tomatoes and peppers alike," explains Fernie. The molecule that triggers the ripening process in peppers and other non-climacteric fruits is something that the scientists are still searching for.


'/>"/>

Contact: Dr. Alisdair Fernie
Fernie@mpimp-golm.mpg.de
49-331-567-8211
Max-Planck-Gesellschaft
Source:Eurekalert  

Related biology news :

1. Mechanisms for a beneficial effect of moderate alcohol consumption on osteoporosis in women
2. Computers can predict effects of HIV policies
3. New study: Raisins as effective as sports chews for fueling workouts
4. Poisoning from industrial compounds can cause similar effects to ALS
5. First seabed sonar to measure marine energy effect on environment and wildlife
6. An economical, effective and biocompatible gene therapy strategy promotes cardiac repair
7. The appetite-suppressing effect of proteins explained
8. Study offers new insights into the effects of stress on pregnancy
9. Scientists reconstruct pre-Columbian human effects on the Amazon Basin
10. The activity of a bacterial effector protein seen in molecular detail
11. Researchers at GW receive federal funds to study the effect earthquakes have on nuclear reactors
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Ethylene of no effect - why peppers do not mature after picking
(Date:11/15/2016)... Research and Markets has announced the addition of the ... their offering. ... The global bioinformatics market ... 6.21 Billion in 2016, growing at a CAGR of 21.1% during ... is driven by the growing demand for nucleic acid and protein ...
(Date:11/14/2016)... 14, 2016  Based on its recent ... & Sullivan recognizes FST Biometrics with the ... Visionary Innovation Leadership. FST Biometrics emerged as ... market by pioneering In Motion Identification (IMID) ... seamless, and non-invasive verification. This patented solution ...
(Date:6/22/2016)... American College of Medical Genetics and Genomics was once again ... of the fastest-growing trade shows during the Fastest 50 Awards ... Las Vegas . Winners are ... of the following categories: net square feet of paid exhibit ... 2015 ACMG Annual Meeting was ranked 23 out of 50 ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... ... 08, 2016 , ... From wearable devices that can improve ... On Thursday, December 15th a panel of entrepreneurs, innovators and a Philadelphia Eagles ... a Smart Talk session. Smart Talk will run from 8:30 – 10:30 a.m. ...
(Date:12/8/2016)... Washington, USA, and CARDIFF, UK (PRWEB) , ... ... ... circuits with very high precision light to control cells — optogenetics — is ... In the current state of the art, spatially patterned light projected via free-space ...
(Date:12/8/2016)... ... December 08, 2016 , ... KBioBox llc announced today ... demand KbioBox developed a sophisticated “3 click” gene dditing off target analysis program ... new website, https://www.kbiobox.com/ and powered by the company’s proprietary BioEngine. ...
(Date:12/8/2016)... , Dec. 8, 2016 Soligenix, Inc. (OTCQB: ... focused on developing and commercializing products to treat rare ... today that it will be hosting an Investor Webcast ... on the origins of innate defense regulators (IDRs) as ... of oral mucositis and the recently announced and published ...
Breaking Biology Technology: