Abstract
The development of individual tillers in stands of pearl millet was investigated in the glasshouse at mean air temp. of 19, 22, 25, 28 or 31°C. The rate of appearance of individual tillers was similar to that on the main culm but later tillers produced fewer leaves. Apical dissection showed that 2-5 leaf primordia failed to emerge from some tillers; the cessation of development preceded any external signs of premature senescence by 3-4 wk. The concept of thermal time was used to determine when leaf appearance ceased on individual tillers. Tiller development stopped synchronously at c. 430° days in all treatments, indicating that it was related to a common physiological or environmental condition. This period corresponded to the start of stem elongation and closure of the crop canopy
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