Science Links Japan | Multidirectional Effects of Exposing Freesia Corms to Chilling on Flower Bud Initiation, Flower Bud Development and Flower Stalk Elongation, and Corm Formation.

Multidirectional Effects of Exposing Freesia Corms to Chilling on Flower Bud Initiation, Flower Bud Development and Flower Stalk Elongation, and Corm Formation.

Accession number;00A0234063

Title;Multidirectional Effects of Exposing Freesia Corms to Chilling on Flower Bud Initiation, Flower Bud Development and Flower Stalk Elongation, and Corm Formation.

Author; TORATA(IMAMURA) YURI (Univ. of Osaka Prefect., Coll. of Agric.) DOI MOTOAKI (Univ. of Osaka Prefect., Coll. of Agric.) IMANISHI HIDEO (Univ. of Osaka Prefect., Coll. of Agric.)

Journal Title;Journal of the Japanese Society for Horticultural Science

Journal Code:F0626A

ISSN:0013-7626

VOL.69;NO.1;PAGE.115-117(2000)

Figure&Table&Reference;FIG.1, TBL.2, REF.6

Pub. Country;Japan

Language;Japanese

Abstract;Corms of Freesia hybrida Hort. 'Cote d'Azur' averaging 6.7g, which had been stored at 30.DEG.C. for 10 weeks, were potted, exposed to seven temperature classes from 3 to 21.DEG.C. for 6 weeks and then transferred to 23.DEG.C.. Flower buds were observed microscopically at the end of exposure to 6,9,12,15, and 18.DEG.C.. The developmental stage of flower buds was most advanced at 12 and 15.DEG.C.; however, the flower buds initiated at 12,15, and 18.DEG.C. failed to develop floral parts, and the elongation of the flower stalks was greatly suppressed upon transfer to 23.DEG.C.. Whereas, plants exposed to 9.DEG.C. for 6 weeks consequently flowered at 23.DEG.C.; those exposed to 6.DEG.C. developed malformed inflorescences having abnormally elongated bracts and lacking floral organs. At 23.DEG.C., the apical meristems of plants exposed to 3.DEG.C. continued to initiate leaf primordia, while those exposed to 21.DEG.C. formed bract-like organs. Daughter corm formation 10 weeks after transferring plants to 23.DEG.C. was most advanced in plants previously exposed to 12.DEG.C. for 6 weeks. Three directional effects of chilling: 1) direct effect on flower bud initiation, 2) after-effect on flower bud development and flower stalk elongation, and 3) direct effect and/or after-effect on corm formation, are discussed. (author abst.)

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