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Effects of Temperature and Photoperiod on the Phenological Development of Barnyardgrass

^a Dep. of Plant Agric., Univ. of Guelph, Guelph, ON, Canada N1G 2W1
^b Dep. of Agronomy, College of Agric., Mashhad, Iran

View larger version (19K): [in a new window]   Fig. 1 Effect of various temperature treatments on the number of leaves on the (a) mainstem and (b) number of tillers plant-1 in barnyardgrass

View larger version (32K): [in a new window]   Fig. 2 Constant photoperiod effect of 8-, 10-, 12-, 14- and 16-h at 20°C on the (a) leaf number, (b) shoot height, (c) leaf stages to floral primordium initiation, (d) shoot dry weight, (e) mainstem inflorescence dry weight, and (f) seed number of barnyardgrass

View larger version (27K): [in a new window]   Fig. 3 Time to first appearance of (a) floral primordia, (b) heading, (c) flowering, (d) end of flowering, (e) first appearance of seed set, and (f) end of seed set for barnyardgrass transferred from long to short day at different days after emergence (DAE). Horizontal line (SD) indicates time required to flower by plants remaining in short day condition throughout the experiment. The intersect of two lines (SD and c) indicates the estimated duration of the juvenile phase

View larger version (17K): [in a new window]   Fig. 4 Leaf number on mainstem of barnyardgrass as influenced by the time of transfer from (a) long to short day and from (b) short to long day

View larger version (16K): [in a new window]   Fig. 5 Effects of time of transfer from (closed circle) long to short day and from (open circle) short to long day on shoot height and shoot dry weight of barnyardgrass

View larger version (26K): [in a new window]   Fig. 6 Effect of time of transfer from long to short day on dry weight of the (a) mainstem inflorescence and (b) number of seeds on the mainstem inflorescence in barnyardgrass

View larger version (20K): [in a new window]   Fig. 7 Time from (•) emergence to first appearance of heading, () flowering, () end of flowering, () initiation of seed set, and () end of seed set for barnyardgrass transferred from short to long day at different times after seedling emergence. Fifteen days after emergence (DAE), the minimum number of thermal days was estimated as 5.6

View larger version (27K): [in a new window]   Fig. 8 Life cycle of barnyardgrass defined in thermal days at a constant temperature of 20°C