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Plant Growth Regulator and Daylength Effects on Preanthesis Main Shoot and Tiller Growth in Conventional and Dwarf Oat

^a MTT Agrifood Research Finland, Plant Production Research, FIN-31600 Jokioinen, Finland
^b Univ. of Minnesota, Dep. of Agronomy and Plant Genetics, 1991 Buford Circle, Borlaug Hall, St. Paul, MN 55108-6026, USA

View larger version (30K): [in a new window]   Fig. 1. Effect of chlormequat chloride (CCC) and ethephon on stem elongation and relative elongation rate (RER) of main shoot and T1 and T2 tillers of oat at 14- and 18-h DL in Exp. 2; DAT is days after treatment. The RER (shown as 1000 x cm cm-1 d-1) is shown between each time of measurement in a cluster of three values: The upper one is for the control, the middle one for CCC, and the lower one for ethephon treatment. At each time of measurement, the same letters indicate no significant difference at P 0.05: The upper letter is for control, the middle one for CCC, and the lower one for ethephon treatment; ns is not significant.

View larger version (42K): [in a new window]   Fig. 2. Effect of chlormequat chloride CCC and ethephon on stem elongation and relative elongation rate (RER) of main shoot and T1 and T2 tillers in conventional height oat ‘Virma’ and ‘Milton’ and a dwarf cultivar Pal in Exp. 2 (DAT is days after treatment). The RER (1000 x cm cm-1 d-1) is shown between each measurement in a cluster of three values: The upper one is for the control, the middle one for CCC, and the lower one for ethephon treatment. At each measurement date, the same letters indicate no significant difference at P 0.05: The upper letter is for control, the middle one for CCC, and the lower one for ethephon treatment; ns is not significant.

View larger version (21K): [in a new window]   Fig. 3. Accumulation of T3 tiller dry weight and relative growth rate (RGR; mg mg-1 d-1) in ‘Milton’, ‘Pal’, and ‘Virma’ at 14- and 18-h daylengths in Exp. 2 (DAT is days after treatment). The RGR is shown between each measurement date in a cluster of three values: The upper one is for Milton, the middle one for Pal, and the lower one for Virma. At each time of measurement, the same letters indicate no significant difference at P 0.05: The upper letter is for Milton, the middle one for Pal, and the lower one for Virma; ns is not significant.

View larger version (71K): [in a new window]   Fig. 4. Effect of chlormequat chloride (CCC) and ethephon on number of green leaves (bars) and total number of emerged leaves per plant produced by the main shoot, and T1, T2, T3, and T4 tillers of oat at 14- and 18-h daylengths in Exp. 1 (DAT is days after treatment). The proportion of leaves produced by the main shoot is shown as the uppermost part of the bar, T1 tiller as the second uppermost, T2 tiller as the third uppermost, and so on. At each measurement date, the same letters indicate no significant difference at P 0.05; ns is not significant.