Details

Autor(en) / Beteiligte

• Blazich, F.A. (North Carolina State University, Raleigh, NC)
• Warren, S.L
• Acedo, J.R
• Reece, W.M

Titel

Seed germination of Rhododendron catawbiense and Rhododendron maximum: influence of light and temperature

Ist Teil von

• Journal of environmental horticulture, 1991-03, Vol.9 (1), p.5-8

Erscheinungsjahr

1991

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Abstract Seeds of Rhododendron catawbiense Michx. and Rhododendron maximum L. were germinated at 25°C (77°F) and 25°/15°C (77°/59°F) with daily photoperiods of 0, 1/2, 1/2 twice daily, 1, 2, 4, 8, 12, or 24 hr. After 30 days at 25°C (77°F), germination of R. catawbiense in darkness was 5% but increased to 64% at 25°/15°C (77°/59°F). At both temperatures, gernlination >95% was attained by day 15 for photoperiods of 1/2 to 12 hr. Regardless of temperature, seeds of R. maximum required light for germination. At 25°C (77°F), increasing photoperiods increased germination with 79 and 81% germination occurring by day 21 for the 12- and 24-hr photoperiods, respectively. The alternating temperature of 25°/15°C (77°/59°F) enhanced germination when light was limiting. At this temperature, germination of 92 to 97% was reached by day 21 for photoperiods ≥4 hr.