Postharvest Biology and Technology

Numbering Code U-AGR01 3A263 LJ78 Year/Term 2021 ・ Intensive, First semester
Number of Credits 2 Course Type Lecture
Target Year 3rd year students Target Student
Language Japanese Day/Period Intensive
Instructor name RYOHEI NAKANO (Graduate School of Agriculture Associate Professor)
Outline and Purpose of the Course The course provides an outline of physiological, biochemical and molecular biological mechanisms that regulate fruit ripening and senescence, and vegetable senescence, flower opening and senescence, and senescence and compositional changes of harvested crops including potato, sweet potato, beans and sweet corn. In connection with the mechanisms, this class also introduces techniques used in postharvest agricultural crops.
Course Goals The goals of this class are understanding physiological and molecular biological changes in harvested agricultural crops and mastering techniques for handling and transporting horticultural crops.
Schedule and Contents It is more effective to provide the rough estimated number of weeks for each subtopics and give a course allotted in the time distribution than to fix the course contents each week. In that case state a supplementary explanation such as “Teachers will observe students’ proficiency level and give assignments or explanation as needed for students to reach the certain level”.

1) Distribution of horticultural crops and Postharvest Physiology (Importance of Postharvest Biology and technology and Loses after harvest)(term1)
2) Fruit ripening (Mechanisms and Postharvest technology established based on the mechanisms) (term2-3)
3) Compositional changes during fruit ripening and storage of harvested crops (coloring , softening, Sugar and Acids, Sugar and potato processing, taste and volatile production) (term3-4)
4) Ethylene biosynthesis and technology (Ethylene biosynthesis pathway and factors that induce ethylene biosynthesis and Postharvest technology related to ethylene biosynthesis)(term4-5)
5) Ethylene response and technology (Ethylene perception and ethylene signal transduction mechanisms and Postharvest technology related to ethylene response) (term5-6)
6) Ethylene biosynthesis and response in cut flowers (Mechanisms and Technology) (term6-7)
7) Recent advance in Ethylene Research (Basic Science and Practical Technology) (term7-8)
8) Respiration of Postharvest Horticultural Crops and Temperture (Effect of temperture on respiration and Technolgy such as pre-cooling, cold storage, and cold chain) (term8-9)
9) Chilling injury and cold storage (Mechanisms of chilling injury and Technology that alleviate chilling injury) (term9-10)
10) Respiration of Postharvest Horticultural Crops and Gas environment (Effect of gas environment on respiration and Modified Atmosphere (MA) packaging) (term10-11)
11) Respiration of Postharvest Horticultural Crops and Gas environment (Effect of gas environment on ethylene biosynthesis and action , and Controlled Atmosphere (CA) storage) (term11-12)
12) Transpiration of Horticultural Crops (Mechanisms that determined transpiration rate and Technology such as conditioning of Sweet potato, Onion and citrus) (term12-13)
13) Recent advance in Postharvest technology and distribution of agricultural crops (Basic Science and Practical Technology) (term13-14)
14) Examination(term15)
15) Feedback(term16)
Evaluation Methods and Policy Evaluation will be based on active participation and Assignments in each term (12 times, 60 points), and an examination (40 points). Assignments will be assessed on the basis of achievement level for course goals.
- Those who are absent more than four times will not be credited.
- Students will submit all assignments.
 The assignments with originality will be given a high score.
Course Requirements None
Study outside of Class (preparation and review) Students are expected to use the library and read the reference books for preparation and review.
Textbooks Textbooks/References No textbook is used. Power Point, Video Contents. The videos of practical scene related to each contents are presented.
References, etc. Postharvest technology of horticultural crop, Kadaer et al. , ( University of California)