What is chilling sensitivity?
chilling-sensitive plant A plant that is badly injured or killed by temperatures above freezing point, up to about 20°C. A Dictionary of Ecology. “chilling-sensitive plant .” A Dictionary of Ecology. . “chilling-sensitive plant .”
How does chilling affect plants?
Chilling is a common environmental stress in nature that can directly affect the physiological functions of chloroplasts. First, chilling can change the lipid membrane state and enzyme activities in chloroplasts. Then, the efficiency of photosynthesis declines, and excess reactive oxygen species (ROS) are produced.
What is the function of chillin?
Which crops are chilling sensitive?
In chilling-sensitive plants, the critical threshold temperature may vary with stage of development. For example, in avocados, papayas, honeydew melons, tomatoes, and mangos, the less mature fruits are usually more sensitive to chilling than the more mature fruits (2, 49-51).
What is chilling injury in horticultural crops?
Chilling injury is damage to plant parts caused by temperatures above the freezing point (32°F, 0°C). Plants of tropical or subtropical origin are most susceptible. Chilling-injured leaves may become purple or reddish and in some cases wilt. Both flowers and fruit of sensitive species can be injured.
What is chilling damage?
How does chilling injury damage the plant in physiology?
A typical chilling injury is an increase in leakage of cell contents from the plant tissues due to the damage affecting the semi-permeability of the plasmelemma, which results in loss of water from cells and thus in a decrease in tissue fresh weight (Lyons, 1973; Ruelland and Collin, 2012).
What is the chilling process?
In general, the term chilling refers to the process in which the temperature of the food is reduced to a low temperature above its freezing point but below the ambient, while the term chilled is used to describe the subsequent state the food is kept in, i.e. the maintenance of the food at that temperature during the …
What is the chilling temperature?
Chilling is the application of temperatures in the range of 0°C to 8°C, i.e. above the freezing point of the food, while freezing uses temperatures well below the freezing point, conventionally below 18°C.
What is the difference between chilling and freezing?
Food preservation at low temperature comprises two distinct processes: chill- ing and freezing. Chilling is the application of temperatures in the range of 0°C to 8°C, i.e. above the freezing point of the food, while freezing uses temperatures well below the freezing point, conventionally below 18°C.
Which of the following is a chill tolerant plant?
Miscanthus × giganteus, the most commonly planted miscanthus type, has been reported to be more chilling tolerant than other phylogenetically related C4 species such as maize (Zea mays), sorghum (Sorghum bicolor) or sugarcane (Saccharum officinarum) (Long and Spence, 2013; Sage et al., 2015).
Which of the following crops are chilling sensitive?
What are the effects of chilling injury?
Consequences of chilling injury are failure to ripen and develop full color and flavor, irregular (blotchy) color development, premature softening, surface pitting, browning of seeds, and increased decay (especially Black mold caused by Alternaria spp.).
What is chilling stress in plants?
Chilling stress is a type of low temperature stress that occurs when plants are exposed to temperatures below optimum but above 0 • C.
What is chilling treatment in plants?
A chilling unit in agriculture is a metric of a plant’s exposure to chilling temperatures. Chilling temperatures extend from freezing point to, depending on the model, 7 °C (45 °F) or even 16 °C (60 °F). Stone fruit trees and certain other plants of temperate climate develop next year’s buds in the summer.
Why do plants need chill hours?
So, why do plants need chill hours? Plants need chill hours to act as a sort of natural clock to tell them when winter is over. That way, they can wait to start producing flowers until bees and other pollinators are active. They can also avoid loss of flowers and fruit due to late spring frosts and freezes.
What is the temperature of chilling?
0°C to 8°C
Chilling is the application of temperatures in the range of 0°C to 8°C, i.e. above the freezing point of the food, while freezing uses temperatures well below the freezing point, conventionally below 18°C.
What is cold stress in plants?
Cold stress, including chilling (0–15°C) and freezing (< 0°C), is an abiotic stress that adversely affects the growth and agricultural productivity of plants (Guo et al., 2018; Liu J. et al., 2018). Chilling stress usually restricts plant growth and development, and has several major effects on plant cells.
Which of the following are more susceptible to chilling injury?
Chilling injury is damage to plant parts caused by temperatures above the freezing point (32°F, 0°C). Plants of tropical or subtropical origin are most susceptible.
Why do you need a chilled condition in an experiment?
Answer: chilling helps to build up the precursor to dormancy, but the process can be easily reversed with a rise in temperature. After the level of precursor reaches a certain threshold, dormancy becomes irreversible and will not be affected by short-term warm temperature peaks.