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Photoperiod Control of Gibberellin Levels and Flowering in Sorghum1

In-Jung Lee2, Kenneth R. Foster3, and Page W. Morgan*

Department of Soil and Crop Sciences, Texas A&M University, College Station, Texas 77843-2474

Regulation of rhythmic peaks in levels of endogenous gibberellins (GAs) by photoperiod was studied in the short-day monocot sorghum (Sorghum bicolor [L.] Moench). Comparisons were made between three maturity (Ma) genotypes: 58M (Ma1Ma1, Ma2Ma2, phyB-1phyB-1, and Ma4Ma4 [a phytochrome B null mutant]); 90M (Ma1Ma1, Ma2Ma2, phyB-2phyB-2, and Ma4Ma4); and 100M (Ma1Ma1, Ma2Ma2, PHYBPHYB, and Ma4Ma4). Plants were grown for 14 d under 10-, 14-, 16-, 18-, and 20-h photoperiods, and GA levels were assayed by gas chromatography-mass spectrometry every 3 h for 24 h. Under inductive 10-h photoperiods, the peak of GA20 and GA1 levels in 90M and 100M was shifted from midday, observed earlier with 12-h photoperiods, to an early morning peak, and flowering was hastened. In addition, the early morning peaks in levels of GA20 and GA1 in 58M under conditions allowing early flowering (10-, 12-, and 14-h photoperiods) were shifted to midday by noninductive (18- and 20-h) photoperiods, and flowering was delayed. These results are consistent with the possibility that the diurnal rhythm of GA levels plays a role in floral initiation and may be one way by which the absence of phytochrome B causes early flowering in 58M under most photoperiods.

1   This work was supported in part by U.S. Department of Agriculture competitive grant no. 91-37304-6582 (to P.W.M.), a Korean Government Overseas Scholarship (to I.-J.L.), a postdoctoral fellowship from the Natural Sciences and Engineering Research Council of Canada (to K.R.F.), and the Texas Agricultural Experiment Station.
2   Present address: Department of Agronomy, Kyungpook National University, Taegu 702-701, Korea.
3   Present address: Alberta Environment, Environmental Assessment Division, Alberta, Canada T2E 7L7.
*   Corresponding author; e-mail p-morgan{at}tamu.edu; fax 1-409-845-0456.

Plant Physiol. (1998) 116: 1003-1011
Copyright Clearance Center:   0032-0889/98/116/1003/09
© 1998 American Society of Plant Physiologists




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