Fresh produce senescence problem, Other Subject

From the moment a fruit or vegetable was harvested from its parent plant, it underwent a process of aging and eventual decay known as senescence. Senescence was marked by two main activities: respiration and transpiration.  

During normal respiration, plants converted oxygen and carbohydrates (acids and sugars) into water, carbon dioxide, and heat-all three of which were emitted from the plant. The mother plant replaced used carbohydrates in the produce (fruits or vegetables) still connected to it; once the produce was harvested, of course, those nutrients could not be replaced. Respiration continued post-harvest until the sugars stored in the produce no  longer sustained it; after that, the produce broke down and lost quality.

Transpiration was the process of losing water. Most produce contained 80% to 95% water at harvest; however, as with respiration, the mother plant could not replace lost water post-harvest. As fruits and vegetables lost water, they lost weight, cell structure, firmness, and appearance-in other words, they began to shrivel and decay. After a water loss of 5% to 10%, produce wilted, shrank, and became unusable and unsalable. Players in the fresh produce global supply chain were always in a race against senescence. While the rate of senescence varied from product to product, its onset was immediate after harvest and rarely allowed more than two weeks to deliver a product from farm to fork. 

Growers harvested most fruits intended for export or a significant journey (e.g., California to Boston) well before they ripened naturally. For example, tomatoes and bananas were typically harvested when they were still completely green. Early harvesting deprived the fruit of its natural ripening process and had a negative effect on the taste, nutritional value, and quality.  If growers could slow or halt the senescence rate of produce in a safe, sustainable way without altering taste or appearance, then they could significantly change their shipping methods, shipment timing, and geographical reach. They could, for example, choose slower and more affordable transportation methods than those currently in use.

Posted Date: 2/18/2013 1:43:43 AM | Location : United States







Related Discussions:- Fresh produce senescence problem, Assignment Help, Ask Question on Fresh produce senescence problem, Get Answer, Expert's Help, Fresh produce senescence problem Discussions

Write discussion on Fresh produce senescence problem
Your posts are moderated
Related Questions
Problem: The existing welfare state has made provisions for the protection and welfare of the elderly. (a) Show the adequacy of these provisions. (b) What changes would y

I am reading in university where i get an reasearch topic on Human beings are responsible for environment degradation I am facing some problems in my assignment of Human beings are

Question 1: Explain the contributions of the National Audit Office (NAO), Public Accounts Committee (PAC) and Office of Public Sector Governance (OPSG) in promoting good gover

The purpose of this assessment is to demonstrate knowledge of scientific concepts and be able to apply this knowledge to health breakdown and nursing practice. Case study Joh

what are the vitiating factors of a contract?

For this task, complete the following: Choose an example of how the government has impacted public policy. For example: Social Security Act, the Affordable Care Act, the 18th Amen


The importance of producing a well-defined project proposal cannot be overstated. The activity of preparing a full project proposal provides you with an opportunity to think throug

Dear sir, I would like to stabilize a power supply 300Vdc/2A out voltage high current. Please help me !!! I’m waiting for your answer, thanks for listen my request. Thank you

Question 1 Discuss the Working Journalists (Fixation of Rates of Wages) Act, 1958. (Act mentions 8 points. There are 3 other subdivisions Question 2 Write a note on the ethos