About Us
Member Directory
Update Member Information
or Register as New Member
2003 Conference
Related WWWs
Announcements
Newsletter
Abstracts
Proceedings
PANICLE PRODUCTION AS AFFECTED BY VARIOUS PRIMARY INDUCTION TREATMENTS AND TIME OF TILLER EMERGENCE IN FIVE PERENNIAL GRASSES
L. T. Havstad
The Norwegian Crop Research institute, Div. Landvik, 4890 Grimstad, Norway
Panicle production as affected by three different combinations of temperature and photoperiod during primary induction (4°C and 24h, 9°C and 10h or 15°C and 10h) and time of tiller emergence (prior to, during and after primary induction) was studied in Scandinavian cultivars of Bromus inermis, Poa pratensis, Festuca pratensis, Dactylis glomerata and Lolium perenne. The lowest percentage of heading plants and the lowest number of panicles per plant was produced after short day (SD)- induction (15°C and 10h) in L. perenne, Festuca pratensis and P. pratensis, and after low-temperature induction (4°C and 24h) in B. inermis and D. glomerata. Tillers emerging prior and during primary induction were most likely to become reproductive in all species. However, as much as 17-32% of non-induced tillers emerging after SD primary induction at 9°C became reproductive in B. inermis, D. glomerata and L. perenne. It is indicated that the generative development of these late emerging non-induced lateral tillers may have occurred after translocation of flowering stimuli from adjacent primary induced main tillers.
Keywords: Bromus inermis; Dactylis glomerata; Festuca pratensis; flowering; induction; Lolium perenne; Poa pratensis.