In vitro Formation and Development of Floral Buds on Tobacco Stem Explants: Effects of Kinetin and Other Factors

Stem segments were excised from plants of Wisconsin 38 tobacco (Nicotiana tabacum L.) in three regions differing in their distance below the inflorescence. They were cultured in vitro in 8- or 16-hr days. After 8 weeks, floral and vegetative buds were counted, and extent of floral development was as...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1977-12, Vol.60 (6), p.881-884
Main Authors: Thomas D. Hillson, LaMotte, Clifford E.
Format: Article
Language:English
Subjects:
Auxins
Callus
Flasks
Flower buds
Flowering
Flowering plants
Flowers
Inflorescences
Photoperiod
Plants
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Summary:Stem segments were excised from plants of Wisconsin 38 tobacco (Nicotiana tabacum L.) in three regions differing in their distance below the inflorescence. They were cultured in vitro in 8- or 16-hr days. After 8 weeks, floral and vegetative buds were counted, and extent of floral development was assessed. Kinetin at 10-5 M inhibited formation and development of floral buds regardless of indoleacetic acid concentration. Supplied at this concentration with adequate auxin, kinetin stimulated vegetative bud formation and may have caused floral bud abortion. Indoleacetic acid (≥ 10-6 M) inhibited vegetative and floral bud formation when supplied with low kinetin concentration (≤ 10-7 M) but did not affect floral development. When supplied with high kinetin concentration (≥ 10-6 M), it inhibited floral bud formation and stimulated vegetative bud formation. More floral buds were formed in 16-hr days than in 8-hr days. Few formed on explants other than those derived from the region nearest the inflorescence regardless of other treatment.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.60.6.881