Flowering in Dactylis glomerata. I. Photoperiodic requirement

Abstract

The photoperiodic requirement for flowering of the temperate perennial grass Dactylis glomerata L. nas investigated in controlled environments. The results shoned that short day (SD) vernalization treatments are ineffectise at early stages of seedling growth and, further, that preliminary long days (LD) may enhance the effectiveness of subsequent SD vernalization. Accordingly, it is suggested that a treatment sequence of LD-SD-LD is more effective than the simpler SD-LD sequence in the promotion of flowering. These results are discussed in relation to established findings for this species.