Lilium tongiflorum Thunb. cv. 'Nellie White' plants were grown in different day/night temperature (DT/NT) environments to determine the anatomical basis for differential responses of stem elongation to DT and NT. Lilium plants were forced in 1986 and 1987 under 25 and 12 different DT/NT environments, respectively, with temperatures ranging from 14 to 30 °C. Parenchyma and epidermal cell length and width were measured in stem tissue (1987) and epidermal cell length and width were measured in leaf tissue (1986). Total cell number per internode and vertical cell number per internode were calculated. Stem parenchyma and stem and leaf epidermal cell length increased linearly as the difference (DIF) between DT and NT increased (DIF = DT -- NT), i.e. as DT increased relative to NT. DIF had no effect on stem parenchyma width, stem and leaf epidermal cell width, or cell number per internode. Data suggested that stem elongation responses to DIF are elicited primarily through effects on cell elongation and not division.
Bibliographical noteFunding Information:
This paper is Minnesota Agriculture Experiment Station 20402. The authors appreciate the assistance of Meriam Karlsson, Cathey Fredenburg, James Eppink, and Sharon Stroh. Lily bulbs were donated by the Pacific Bulb Grower's Association. This project was funded in part by The Minnesota Agriculture Experiment Station, The Michigan State Agriculture Experiment Station, growers supportive of University of Minnesota and Michigan State research, and a grant from the Fred C. Gloeckner Foundation.
Copyright 2010 Elsevier B.V., All rights reserved.
- Cell division
- Cell elongation
- Leaf expansion
- Stem elongation