Control of Flowering

Control of Flowering

Studies on flowering control and optimization of water and nutrient management in horticultural crops

Staff

Yuichi YOSHIDAProf. Dr. YOSHIDA Yuichi
E-mail: yyoshida (please add @okayama-u.ac.jp)
Specialty: Vegetable crop science
Environmental and nutritional control of reproductive and vegetative development of strawberries and tomatoes
Tanjuro GOTOProf. Dr. GOTO Tanjuro
E-mail: tangoto (please add @okayama-u.ac.jp)
Specialty: Floriculture
Investigation of nutrient absorption properties and growth control under root zone restriction of ornamental plants

Research Topics

‘Rakuchin’, a table top production system for strawberries

As strawberries grow and bear fruit just above ground, hard labor in a crouching position for picking and plant management have restricted large-scale production. We developed a new substrate culture system for strawberries ‘Rakuchin’ as one goal of our strawberry research. Now we are upgrading the system equipment and technical description, and also performing physiological strawberry research based on our production system.

Fig. 1
Qualified fruit production and development of blossom-end rot in tomato grown with root restriction

Tomato plants can grow with very small root volume when frequent fertigation is conducted in proportion to solar radiation. Adequately fertigated plants produce qualified but small fruits, and blossom-end rot (BER) often develops in young rapidly growing fruits. We are developing a productive tomato growing system with strict root-zone restriction and performing physiological research on BER development in relation to Ca nutrition.

Fig. 2
Rose cut flower production using closed bench cultivation in consideration for the environment

Environmental pollution from the disposal of used rock wool and the discharge of waste solution has become a major problem in rose production. A new rose production method that is eco-friendly and can produce high quality cut flowers is demanded. We are developing a closed bench culture bench that can eliminate the need to abandon outside used nutrient solution.

Fig. 3
Cell transplant production and bedding plants production using compacted medium

We found that medium could be hardened using heat fusion fiber. We also found normal growth of cell transplants and that they were not affected by the hardened medium after transplanting. We demonstrated that use of hardened medium could enable bedding plant production without polyethylene pots. Pansy and garden-type cyclamen plants grown in compacted medium without polyethylene pots in the summer season were bigger than those grown in compacted medium with polyethylene pots. The temperature of the medium without polyethylene pots was lower than that with polyethylene pots. This could be due to the evaporative cooling effect from the surface of compacted medium without polyethylene pots.

Fig. 4

Publications

・Yoshida, Y., Irie N., Vinh, T. D.,Tnaka, Y., Yasuba, K. and Goto T. : Incidence of blossom-end rot in relation to the water-soluble calcium concentration in tomato fruits as affected by calcium nutrition and cropping season. J. Japan. Soc. Hort. Sci. 83、282-289(2014)
・Yamaguchi, N., Goto T., Kobiki K., Otani S., Tnaka, Y. and Yoshida, Y. Effect of Minimum Air Temperature on Occurrence of Abnormal Inflorescence and Cut Flower Quality in Gypsophila paniculata ‘Altair’. Hort. Res. 13, 161-167 (2014)
・Yoshida, Y.: Strawberry production in Japan: History and current progress in cultivation technology and cultivars, International Journal of Fruit Science, 13, 103-113 (2013)
・Ishikura S., Goto T., Kajihara S. and Higashiura M.: Effect of Pulsed Lighting from Yellow Fluorescent Light Emitting Diodes on the Budding, Flowering and Flower Characteristics of Small-flowered Spray Type Chrysanthemums . Hort. Res. 12, 419-426 (2013)
・Yoshida, Y., Ozaki E., Murakami K. and Goto T. : Flower induction in June-bearing strawberry by intermittent low temperature storage. J. Japan. Soc. Hort. Sci. 81, 343-349(2012)
・Goto, T., Shimizu N., Koma Y., Morishita T. , Fujii K., Nakano Y. and Shima K.:Effects of polyethylene pot removal and irrigation method on growth and flowering of garden-type cyclamen. Acta Horticulture, 886, 83-90.(2011)