Study on the year-round and high yield fruit production of passionfruit in a plant factory

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K06012
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 39030:Horticultural science-related
• Research Institution: Chiba University
• Principal Investigator: Ohkawa Katsuya 千葉大学, 大学院園芸学研究院, 講師 (00312934)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: パッションフルーツ / 花芽分化 / 花蕾発育 / 光合成 / 炭酸ガス / 根圏温度 / 果実肥大 / 着果数

Outline of Final Research Achievements

For the production of passionfruit in plant factory, flower bud development, number of leaves per fruit, and the effects of CO2 condition on fruit set and fruit quality of passionfruit grown in soilless culture were examined. The flower bud development of passionfruit is affected by the amount of fruit set, and when the amount of fruit set increases, the supply of photosynthetic products and inorganic components is reduced and the development is stopped. I found that the optimum number of leaves per fruit was 9. Carbon dioxide application did not affect the growth of current shoots, but promoted flower bud differentiation, increased the number of fruit set, and promoted fruit enlargement. These results indicate that CO2 application to passion fruit may increase fruit productivity by increasing the photosynthetic rate of leaves and lowering the optimal number of leaves per fruit.

Free Research Field

果樹園芸学

Academic Significance and Societal Importance of the Research Achievements

本研究により，パッションフルーツの花芽分化，花蕾発育と光合成産物や無機成分との関係，また適切な葉果比が明らかとなった．また，炭酸ガス環境や根圏および新梢の温度などの環境制御により，着果数や果実肥大促進効果のあることが明らかとなった．これらの知見を基に，太陽光利用型植物工場でのパッションフルーツ栽培における積極的な環境制御技術およびこれらを用いた高品質果実の多収生産技術の確立につなげることが可能と考えられる．