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JP-7856257-B2 - Method for suppressing fruit peel damage and materials used in the method

JP7856257B2JP 7856257 B2JP7856257 B2JP 7856257B2JP-7856257-B2

Inventors

  • 竹岡 賢二
  • 金好 純子
  • 松岡 真希
  • 柳本 裕子

Assignees

  • 広島県

Dates

Publication Date
20260511
Application Date
20220317

Claims (11)

  1. A method for suppressing peel damage that occurs in citrus fruits during growth, The period from any point within the time frame until the harvest season when the cumulative total solar radiation from the full bloom date of the citrus fruits becomes 1246 MJ/ m² or less, A method for suppressing damage to the fruit peel, characterized by covering the surface of the citrus fruit with a material whose light transmittance is 43.9% or less across the entire wavelength range corresponding to the wavelength of visible light.
  2. A method for suppressing peel damage that occurs in citrus fruits during growth, The period from any point within the time frame until the harvest season when the cumulative total solar radiation from the full bloom date of the citrus fruits becomes 1246 MJ/ m² or less, A method for suppressing damage to the fruit peel, characterized by covering the surface of the citrus fruit with a material whose light transmittance is less than 31.7% across the entire range of wavelengths from 423 nm to 720 nm.
  3. A method for suppressing peel damage that occurs in citrus fruits during growth, The period from any point within the time frame until the harvest season when the cumulative total solar radiation from the full bloom date of the citrus fruits becomes 1246 MJ/ m² or less, A method for suppressing damage to the fruit peel, characterized by covering the surface of the citrus fruit with a material whose light transmittance is less than 11.0% in the entire range of wavelengths from 423 nm to 660 nm.
  4. The method for suppressing peel damage according to any one of claims 1 to 3, characterized in that the citrus fruit is a pomelo.
  5. The method for suppressing peel damage according to any one of claims 1 to 4, characterized in that the citrus fruit is Mizuki (Ministry of Agriculture, Forestry and Fisheries Variety Registration No. 27604).
  6. A method for suppressing peel damage according to any one of claims 1 to 5, characterized in that the peel damage is yellowing.
  7. A method for suppressing peel damage occurring in the fruit of Mizuki (Ministry of Agriculture, Forestry and Fisheries variety registration no. 27604) during its growth, characterized in that the surface of Mizuki is covered with a material having a light transmittance of less than 11.0% in the entire range of wavelengths from 423 nm to 660 nm, from any point in the period until the time when the cumulative total solar radiation from the day of full bloom of Mizuki becomes 1246 MJ/m² or less until the harvest period.
  8. A method for suppressing peel damage according to claim 1, wherein the material covering the citrus fruits does not contain additives that have the function of reflecting infrared rays, has a light transmittance of 43.9% or less in the range of all wavelengths corresponding to the wavelength of visible light, and is a bag -like body with an opening that is large enough to cover the fruit from any point in the period until the time when the cumulative total solar radiation of the citrus fruits from the day of full bloom becomes 1246 MJ/m² or less until the harvest time, and the opening of the material, or the area around the opening, is sealed with a fruit covering maintenance means.
  9. A material used in the method for suppressing peel damage described in claim 1, characterized in that it is for suppressing the occurrence of yellow spots, does not contain any additives that have the function of reflecting infrared rays, does not contain or add any additives that have the function of reflecting ultraviolet rays or making ultraviolet rays less permeable, and has a light transmittance of 43.9% or less in the range of all wavelengths corresponding to the wavelength of visible light.
  10. The material according to claim 9, characterized in that it is large enough to cover the citrus fruit from any point in the period until the time when the cumulative total solar radiation from the day of full bloom of the citrus fruit becomes 1246 MJ/ m² or less, until the harvest time of the citrus fruit.
  11. The material according to claim 9 or 10, characterized in that it has an opening, the opening can be opened or closed, and the size when open is greater than or equal to the size of the fruit at harvest, and the size when closed is greater than or equal to the thickness of the branch but less than or equal to the size of the fruit when covered.

Description

Application of Article 30, Paragraph 2 of the Patent Law 1) Publication in a publication (proceedings) [Publication date] March 17, 2021 [Publication] Journal of Horticultural Science, Vol. 20, Supplement 1-2021 - Research presentation at the Spring Meeting of the Japanese Society for Horticultural Science, 2021 [Publishers] Yoshiko Kaneko, Yuko Yanagimoto, Maki Matsuoka, Kenji Takeoka, Takeshige Morita [Published content] We presented the results and considerations of various fruit bag tests to reduce yellow spotting, a peel disorder of the new citrus variety "Mizuki". 2) Publicly disclosed through presentation at a conference (academic meeting) [Date (date the invention was announced)] March 27, 2021 [Name and location of the conference] The Japanese Society for Horticultural Science, Spring Conference 2021, online [Presenters] Yoshiko Kaneko, Yuko Yanagimoto, Maki Matsuoka, Kenji Takeoka, Takenari Morita [Content of the disclosed invention] We presented the results and considerations of various fruit bags tested as a measure to reduce yellow spots, a peel disorder of the new citrus variety "Mizuki". 3) Publicly disclosed through publication (magazine) [Publication date] May 1, 2021 [Publication] Fruit Hiroshima, May 2021, Vol. 41 [Presenter] Maki Matsuoka [Content of the disclosed invention] We presented the results and considerations of various fruit bags tested as a measure to reduce yellow spots, a peel disorder of the new citrus variety "Mizuki". This invention relates to a method for suppressing peel damage occurring on the peel of citrus fruits and materials used in this method. Mizuki (Ministry of Agriculture, Forestry and Fisheries Variety Registration No. 27604), registered in 2019, is a new variety of pomelo, a type of citrus fruit, and is not yet available on the market. Mizuki is a hybrid of the seed parent Suisho Buntan and the pollen parent Southern Yellow. It has a bright yellow peel, a large fruit size of approximately 11 cm in diameter, high sugar content, excellent flavor, very few seeds, and abundant juice, making it suitable for cut fruit. It can be shipped during the citrus off-season from mid-April onwards, has good storage properties, and is expected to be a popular gift item, commanding a high price. However, during the aforementioned Mizuki season, as shown in Figure 1, yellow spots, approximately 5 mm in size, appear on the green fruit peel between August (summer) and mid-November (late autumn). These yellow spots are numerous on the sun-exposed surfaces of fruits on the outer perimeter of the tree. When the locations of occurrence are divided into fruit-bearing areas on the tree and fruit itself, Table 1 shows the order of occurrence: upper sun-exposed surfaces on the outer perimeter, lower sun-exposed surfaces on the outer perimeter, inner sun-exposed surfaces, and shaded surfaces on both the outer and inner perimeters. In particular, occurrence is remarkably high on the upper and lower outer perimeters. The aforementioned yellow spots, in some cases, would turn brown during the harvest season, leaving marks. This resulted in brown spots scattered across the bright yellow peel, lowering the fruit's grade during sorting and hindering sales in the higher price range. While the aforementioned yellow spots have not been observed in any other citrus varieties to date, they are a potential issue that may occur in new citrus varieties as breeding progresses. Furthermore, since the yellow spots do not affect the fruit pulp, even if they occur, the fruit retains its characteristic high sugar content, excellent flavor, extremely low seed content, and abundant juice. One disorder that causes the green peel of citrus fruits to turn yellow is called sunburn. However, sunburn differs from the aforementioned yellow spotting in terms of size, color, and symptoms. Sunburn occurs when, during high summer temperatures, particularly after prolonged rain, strong sunlight hits the fruit's surface for several hours, causing the peel surface temperature to exceed 40°C. This results in a widespread yellow to brownish discoloration and peel depressions across almost the entire sun-exposed surface of the green fruit. While yellow spotting is characterized by numerous small lesions, sunburn differs in that each lesion covers a large area, resulting in yellow to brownish depressions. As a countermeasure against sunburn, for example, the fruit is covered with a stretchable synthetic fabric from late July to around August. Patent Document 1 discloses a fruit growing bag made of a film having the function of transmitting visible light and blocking ultraviolet rays, and equipped with an opening for inserting fruit. Patent Document 2 discloses a fruit bag made of a resin film that is transparent to visible light, wherein when the transmittance of the resin film at a wavelength of 540 nm is T540 and the transmittance of the resin film at a wavelength of 850 nm is T850, the value of T850/T540 is 0.85 or less, an