Effects of Temperature on the Growth and Flowering of Zephyranthes candida Herb.
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Accession number;99A0922070
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| Title;Effects of Temperature on the Growth and Flowering of Zephyranthes candida Herb. |
| Author;
MORI GENJIRO
(Univ. of Osaka Prefect., Coll. of Agric.)
IMANISHI HIDEO
(Univ. of Osaka Prefect., Coll. of Agric.)
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Journal Title;Journal of the Japanese Society for Horticultural Science
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Journal Code:F0626A
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ISSN:0013-7626
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VOL.66;NO.1;PAGE.133-140(1997)
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| Figure&Table&Reference;FIG.6, TBL.2, REF.12 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The growth periodicity of Zephyranthes candida grown outdoors and the effect of temperature on the initiation and development of flower buds were investigated. A bulb has a sympodial branching system; each unit of the sympodial branch is composed of 2 foliage leaves with a circular base and 1 foliage leaf with semi-circular base in 1/2 alternate arrangement from the base upwards and terminates in an inflorescence with 1 floret. During the growing period, extending from spring to autumn, repeated sympodial branching results in 3-4 inflorescences. In October, after the flowering season, 2 inflorescence primordia remain in each bulb. The first inflorescence is at carpel initiation stage and the pollen mother cell is at the tetrad stage; the pollen grains mature and become functional between June and August of the following year. Anthesis occurs from July to September. When plants with inflorescences at carpel differention stage were moved to a growth chamber kept at 10.DEG., 15.DEG., 23.DEG. or 30.DEG.C, plants transferred to 23.DEG.C chamber developed flower buds most rapidly and reached the pollen formation stage 4 months later and bloomed after 20 days. Plants kept at the other temperature regimes had fewer inflorescences and flowered later. In plants kept continuously at 23.DEG.C. from October, the first inflorescence flowered in March of the following year. During the growing period for about 13 months, these plants produced 4.7 flowering inflorescences and initiated 5.1 inflorescences by repeated sympodial branching. In a commercial forcing trial, plants kept at a min. 20.DEG.C. from early March flowered in May, 2 months earlier than the natural flowering time. (author abst.) |
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