Language：Japanese   Publisher：Journal of Forest Research  

Global warming is expected to hamper bud endodormancy. Understanding endodormancy in low chill availability environments helps to predict endodormancy in future winters. The objective of this study was to elucidate characteristics of endodormancy and physiology in Quercus acutissima seedlings in a nursery under a vinyl sheet in the southern part of the warm-temperate zone. Endodormancy was evaluated by examining leaf phenology of seedlings in the nursery, and bud break of shoot cuttings in growth promoting conditions from October to March. Water content (WC), relative water content (RWC), respiration rate, concentrations of starch, and sugars (glucose, fructose, and sucrose) were measured in twigs and buds of current-year shoots. As leaves decolorized towards December, bud break rates increased. Complete leaf browning paralleled low bud break rates in January and February indicating endodormancy. Compared to species in high chill availability environments which typically enter endodormancy in autumn and release in mid-winter, our results suggested delays in the onset and release of endodormancy, providing time for buds to develop before endodormancy onset. Decreased respiration rates and starch concentrations in twigs and buds coincided with the endodormancy period. These were accompanied by high concentrations of glucose and fructose, suggesting changes in the respiratory mechanism, and occurrence of starch to sugar conversion. Increased WC in twigs at endodormancy onset was speculated as a response to the environment, related to endodormancy regulation and/or freezing tolerance. A prominent phenomenon in buds was the elevated RWC irrespective of hydration at endodormancy onset, suggesting a decline in water holding capacity.

DOI： 10.1080/13416979.2024.2435282

Scopus

Language：Japanese   Publisher：Japanese Society for Tropical Agriculture  

<p>We investigated the genetic characteristics and fruit quality of Hetsuka Daidai, a citrus that is a specialty of the southern part of the Osumi Peninsula in Kagoshima Prefecture. Based on the results of CAPS (cleaved amplified polymorphic sequence) analysis, Hetsuka Daidai had cytoplasm derived from pummelo and was closely related to Kabusu (sour orange), Natsudaidai, and Kimikan. No difference was observed in the CAPS genotype of either nuclear or chloroplast among the four Hetsuka Daidai accessions used in this study. After a four-year investigation of the fruit quality, the green color remained on the rind and the titratable acidity (TA) was about 4% from the end of September to October during the main period of harvesting. The fruit weight continued to increase with maturity and was about 100g in late October. Regarding the organic acid composition, the rate of citric acid was about 97% and the ascorbic acid content was 19.2 - 28.0 mg･100 mL^-1. Limonene had the highest aroma component at 81.2%, followed by 9.8% of γ-terpinene, 2.6% of β-myrcene, 1.4% of α-pinene, 1.2% of p-cymene, and 1.1% of sabinene. No aroma components, characteristic of Hetsuka Daidai, were found. Even in the sensory evaluation of the aroma, we could not confirm the items characteristic of this fruit. From these results, it was suggested that the scent balance was different from that of other citrus fruits and that it was unique to Hetsuka Daidai.</p>

DOI： 10.11248/nettai.17.1

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Event date： 2019.8

Language：Japanese   Presentation type：Poster presentation  

Venue：長崎大学  

Event date： 2019.8

Language：Japanese   Presentation type：Poster presentation  

Venue：長崎大学  

Event date： 2019.8

Language：Japanese   Presentation type：Poster presentation  

Venue：長崎大学  

Event date： 2018.9

Language：Japanese   Presentation type：Poster presentation  

Venue：東海大学  

Event date： 2018.9

Language：Japanese   Presentation type：Poster presentation  

Venue：東海大学  

Applicant：鹿児島大学

Application no：特願2024-1905528  Date applied：2024.6

Applicant：鹿児島大学法人　鹿児島大学

Application no：特願2015-142112  Date applied：2015.7

Announcement no：特開2017-23009  Date announced：2017.2

Patent/Registration no：特許6757923号  Date registered：2020.9 

Country of applicant：Domestic