Navigation Links
Increasing the diversity of marketable raspberries
Date:4/28/2014

COLLEGE PARK, MD -- Raspberries are the third most popular berry in the United States. Their popularity is growing as a specialty crop for the wholesale industry and in smaller, local markets, and U-pick operations. As consumer interest in the health benefits of colorful foods increases, small growers are capitalizing on novelty fruit and vegetable crops such as different-colored raspberries. Authors of a newly published study say that increasing the diversity of raspberry colors in the market will benefit both consumers and producers. "Producers will need to know how fruit of the other color groups compare with red raspberries with regard to the many postharvest qualities," noted the University of Maryland's Julia Harshman, corresponding author of the study published in HortScience (March 2014).

Raspberries have an extremely short shelf life, which can be worsened by postharvest decay. Postharvest susceptibility to gray mold (Botrytis cinerea) drastically reduces the shelf life of this delicate fruit. "The main goal of our research was to compare the postharvest quality of different-colored raspberries that were harvested from floricanes under direct-market conditions with minimal pesticide inputs," Harshman said. The researchers said that, although there is abundant information in the literature regarding red raspberry production in regard to gray mold, very little research has been conducted on postharvest physiology of black, yellow, or purple raspberries.

The researchers analyzed 17 varieties of raspberries at the USDA's Agricultural Research Center in Beltsville, Maryland, examining each cultivar for characteristics such as anthocyanins, soluble solids, titratable acids, pH, color, firmness, decay and juice leakage rates, ethylene evolution, and respiration.

"In comparing the four commonly grown colors of raspberry, we drew several important conclusions," they said. "The mechanisms controlling decay and juice leakage are distinct and mediated by both biotic and abiotic factors. The colors that performed well for one area are opposite the ones that did well in the other." For example, firmness was expected to track closely with either leakage or decay resistance; however, the analyses did not indicate this.

Red raspberries, in comparison with the other three colors analyzed during the study, had the highest titratable acids (TA) and the lowest ratio of soluble solids to TA, which, the authors say, accounts for the tart raspberry flavor consumers expect.

Yellow raspberries had the lowest levels of anthocyanins and phenolics. Their TA was lower than red raspberries, but their ratio of soluble solids to TA was the second highest. "This bodes well for consumer acceptance because this measure is an important indicator of flavor," Harshman said. Although yellow raspberries were among the firmest varieties at harvest, they were found to be very susceptible to gray mold, particularly after being harvested on overcast, cool, humid days.

Black raspberries resisted leakage the least of all of the colors, particularly after rainy, humid, overcast days. The authors observed that this quality will make it challenging to move black raspberries into the wholesale fresh market.

Purple raspberries--a hybrid between red and black raspberries--had the third highest anthocyanin and phenolic content, and their flavor was intermediate between black and yellow raspberries. "Similar to black raspberries, their ability to resist juice leakage was poor, and cool weather tended to exacerbate this," the authors said.

"We have shown for the first time that when significant differences between ethylene rates and decay incidence coincide; the berries that produced the highest ethylene rates rotted the most quickly," Harshman said. "Our findings have great impact because they open the door for potential disease mitigation strategies that center around lowering ethylene emission rates on berries to reduce decay."

The authors say that their findings should also be useful to plant breeders, who can use the information to screen raspberry germplasm to look for berries to use as material for generating more decay-resistant fruit.


'/>"/>

Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert  

Related biology news :

1. Surprising pine beetle breeding habits help explain increasing tree damage, says CU study
2. Increasing clarity for medics in suspected physical abuse cases
3. Increasing water scarcity in Californias Bay-Delta will necessitate trade-offs; hard decisions needed to balance various environmental risks
4. Increasing predator-friendly land can help farmers reduce costs
5. Loss of biodiversity increasingly threatens human well-being: UBC, University of Michigan research
6. Increasing levels of carbon dioxide in Arctic coastal seas
7. A Kit for increasing insulin production
8. Environmental concerns increasing infectious disease in amphibians, other animals
9. Increasing drought stress challenges vulnerable hydraulic system of plants, GW professor finds
10. Fire and ice: Wildfires darkening Greenland snowpack, increasing melting
11. Community-based nutrition education shown to be successful in increasing calcium intake
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Increasing the diversity of marketable raspberries
(Date:2/3/2016)... , February 3, 2016 ... market research report "Automated Fingerprint Identification System Market by ... Search), Application (Banking & Finance, Government, Healthcare, and Transportation) ... MarketsandMarkets, the market is expected to be worth USD ... 21.0% between 2015 and 2020. The transformation and technology ...
(Date:2/2/2016)... 2016  BioMEMS devices deployed in hospitals ... medical screening and diagnostic applications, such as ... that facilitate and assure continuous monitoring without ... being bolstered through new opportunities offered by ... coupled with wireless connectivity and low power ...
(Date:2/2/2016)... YORK , Feb. 2, 2016 Technology Enhancements ... presents an analysis of the digital and computed radiography ... Malaysia , and Indonesia ... trends and market size, as well as regional market ... country and discusses market penetration and market attractiveness, both ...
Breaking Biology News(10 mins):
(Date:2/4/2016)... LEXINGTON, Massachusetts , February 4, 2016 - New ... --> - New FDA action date of July ... date of July 22, 2016   - ... the U.S. in the past decade indicated for the treatment of signs and ... Lifitegrast has the potential to be the only product approved in the ...
(Date:2/4/2016)... 4, 2016  CytoSorbents Corporation (NASDAQ: CTSO ... flagship CytoSorb® blood filter to treat deadly inflammation ... world, announced that CEO Dr. Phillip Chan ... Capital Group,s 2016 Disruptive Growth & Healthcare Conference, ... Conference Presentation Details: Where: Convene ...
(Date:2/4/2016)... Feb. 4, 2016 Sinovac Biotech Ltd. ("Sinovac" ... provider of biopharmaceutical products in China ... board of directors received on February 4, 2016 a ... a consortium comprised of PKU V-Ming ( Shanghai ... Ltd., CICC Qianhai Development ( Shenzhen ) ...
(Date:2/3/2016)... 2016  Discovery Laboratories, Inc. (NASDAQ: DSCO ... KL4 surfactant therapies for respiratory diseases, today announced ... inducement award as a component of employment compensation ... President and Chief Executive Officer.  The award was ... 1, 2016 and granted as an inducement material ...
Breaking Biology Technology: