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Delayed Flowering and Pollen Production in Male-Sterile Sugarcane Subjected to Extended Day-Length

Six early- to mid-season flowering sugarcane clones (Saccharum officinarum L. x S. sinense Roxb. x S. spontaneum L.) that are highly male sterile were subjected to a 12-5-hour photoperiod for 2, 4, and 6 weeks between September 13 and October 25. The 2- and 4-week treatments were applied at the beginning and toward the end of the period.

Longer durations of treatment caused greater delay of flowering, and a given duration caused greater delay of flowering when applied toward the end of the period. Maximum delay of flowering among clones ranged from 10 to 72 days. The earliest flowering clone could be crossed with all mid-season flowering clones, and the midseason flowering clones could be crossed with most, if not all, late-flowering clones of interest in the crossing program.

All clones produced pollen after flowering was delayed, and they were effective pollen parents. Delay of flowering to first pollen shedding ranged from 13 to 32 days among clones.

Key Words: Photoperiod • Anther dehiscence • Pollen viability • Synchronization of flowering • Cultivar evaluation

Received for publication July 25, 1969.