2002 Fiscal Year Final Research Report Summary
Study on recurrent flowering and malformed fruit development in strawberry during summer season
| Project/Area Number |
13660021
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
園芸・造園学
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| Research Institution | Utsunomiya University |
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Principal Investigator |
FUJISHIGE Nobuaki Utsunomiya Univ. Agriculture, Assoc. professor, 農学部, 助教授 (40008016)
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| Co-Investigator(Kenkyū-buntansha) |
YAMANE Kenji Utsunomiya Univ. Agriculture, Assoc. professor, 農学部, 助教授 (60240066)
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| Project Period (FY) |
2001 – 2002
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| Keywords | strawberry cultivar 'Raiho' / flower bud initiation / recurrent flowering / chlorophyll fluorescence / achene / night cooling and short-daytreatment / CO2 enrichment / malformed fruit |
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| Research Abstract |
Strawberry plants are sensitive to high temperature. It is difficult to get good quality fruits during summer season in Japan. Strawberry cultivar 'Raiho' { Enrai (Donner x CN-18 seedling) and Nyoho seedling} have some ever-bearing traits and can be harvested even in summer season. But the intensity of recurrent flowering trait is poor and fruits become small and malformation occurred In order to clarify that and improve yields and quality of fruits, we did experiments as follows ; The night cooling and short-day treatment for flower bud induction from July to August was applied to strawberry cultivar 'Raiho' grown in modified NFT system in a greenhouse. This experiment was repeated in phytotoron in Utsunomiya University.
1. The night cooling and short-day treatment to strawberry for 4 or 6 weeks in summer induced recurrent flowering.
2. Flower bud of second flower cluster was difficult to induce in strawberry plants grown at day/night temperature, 32/25℃ and 27/22℃ during summer and fall season
3. Pollen viability assessment by an in vitro assay and acetocarmine staining was no significant change between September and December.
4. Achenes of berry are classified as unfertilled achenes(UA), fertilized but poorly developed ones(PA) and filled ones(FA) by microscopic digital camera and processing. The size of UA is under 0.4 mm2, the PA is 0.4〜0.8 mm2 and FA is above 1 mm2.
5. Photosynthetic potential and stress level of strawberry plants under different temperature was measured by monitoring of chlorophyll fluorescence. Fv/Fm and ΦPSII was low in strawberry plants grown at 37/25℃ day/night temperature, so photosynthetic activity was decreased.
6. High temperature may reduce carbohydrate contents in whole plants and lower partitioning rate to fruits. C02 enrichment on the strawberry plants at high temperature did not necessarily improved fruit quality except total soluble solid content.
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Research Products
(4 results)
