Faculty and research guide

Laboratory of the Postharvest Physiology of Horticultural Crops

Kazuki Yamawaki, Masaya Kato

In the Laboratory of the Postharvest Physiology of Horticultural Crops, we are doing research on some of the following themes and are considering others for future examination. We deal with a great variety of horticultural crops (fruits, vegetables, and flowers), and our research orientation covers the range from basic principles to the real-life application of our findings. Students’ interests and goals are respected, and their research themes are determined after due consideration, in consultation with their advisers. We aim to produce independent researchers who will plan experiments, carry them out, and complete their research on their own.

Research on damage due to low temperatures and its prevention (Yamawaki)

  • Current understanding and the practical application of the phenomenon of low-temperature resistance acquired through a high-temperature treatment
  • Current understanding and the practical application of the phenomenon of low-temperature resistance acquired through a conditioning treatment
  • Clarification of the mechanism of acquiring low-temperature resistance using cultured cells
  • The influence of high temperatures upon the physiology of fruits and vegetables
  • The acquisition of low-temperature resistance through stress or treatments other than temperature changes
  • The relationship of ascorbic acid to low-temperature resistance in fruits and vegetables
  • The mechanism of the oxidization of ascorbic acid as a result of low-temperature damage

Research on ethylene and the nutritional or functional ingredients in horticultural crops (Kato)

<The metabolisms of carotenoid and Vitamin C in citrus fruit>
  • The accumulation of carotenoid and Vitamin C in different citrus varieties.
  • Isolation and identification of the key genes related to carotenoid and Vitamin C metabolism in citrus fruits
  • Discover novel transcriptional factors involved in carotenoid catabolism by microarray assay
<Elucidation of the regulatory mechanisms of carotenoid and Vitamin C accumulation in citrus fruit>
  • In our laboratory, a culture system has been successfully set up with the juice sacs of three citrus varieties, Satsuma mandarin (Citrus unshiu Marc.), Valencia orange (Citrus sinensis Osbeck) and Lisbon lemon (Citrus limon Burm.f.) in vitro. Using this culture system, the key factors that control the accumulation of carotenoid and vitamin C are investigated.
<Elucidation of the senescence mechanism in broccoli and cauliflower after harvest>
  • Ethylene and Vitamin C metabolism in broccoli and cauliflower after harvest.
  • Isolation and identification of the key genes related to ethylene and Vitamin C biosynthesis in broccoli and cauliflower after harvest.
  • The application of different postharvest treatments, such as 1-MCP, electrostatic atomization, and LED lights, in delaying the senescence of broccoli and cauliflower after harvest.


Broccoli


Cauliflower


Cultured juice sacs in citrus fruits

Topics

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