Abstract:

The aim of this research was to discuss the effect of night-break treatment on flowering of sugarcane in different strain and year. Experiments about different light intensity of night-break were conducted to study the effects of night-break on sugarcane’s flowering in 2006, 2007 and 2008. The results showed that delaying the flowering date for most early-flowering clones by all treatment was successful; for those tested strains, under the night-break treatment each year, with the increase of light intensity, the initial flowering date was delayed, the date of flowering in peak was postponed, the heading rate was declined; in the same year, for different clone, their beginning date of flowering, delayed days of the flowering and heading rate were very different; with the increase of light intensity, for the same clone on test, the beginning date of the flowering, the delayed days of the flowering, and the heading rate, had a trend of increasing difference among these years; the flowering time sustain for about a month, and it wasn’t impacted by different light intensity. For most early-flowering clones, the range of light intensity from 10.5~105 lx was effective to delay flowering time. This research would provide technical support and theoretical basis for sugarcane germplasm innovation and crossed fuzz production.