NDLI: Response of actin microfilaments during phytochrome-controlled growth of maize seedlings

Content Provider	Springer Nature Link
Author	Waller, F. Nick, P.
Copyright Year	1997
Abstract	In seedlings of maize (Zea mays L. cv. Percival), growth is controlled by the plant photoreceptor phytochrome. Whereas coleoptile growth is promoted by continuous far-red light, a dramatic block of mesocotyl elongation is observed. The response of the coleoptile is based entirely upon light-induced stimulation of cell elongation, whereas the response of the mesocotyl involves light-induced inhibition of cell elongation. The light response of actin microfilaments was followed over time in the epidermis by staining with fluorescence-labelled phalloidin. In contrast to the underlying tissue, epidermal cells are characterized by dense longitudinal bundles of microfilaments. These bundles become loosened during phases of rapid elongation (between 2–3 days in irradiated coleoptiles, between 5–6 days in dark-grown coleoptiles). The condensed bundles re-form when growth gradually ceases. The response of actin to light is fast. If etiolated mesocotyls are transferred to far-red light, condensation of microfilaments can be clearly seen 1 h after the onset of stimulation together with an almost complete block of mesocotyl elongation. The observations are discussed in relation to a possible role of actin microfilaments in the signal-dependent control of cell elongation.
Starting Page	154
Ending Page	162
Page Count	9
File Format	PDF
ISSN	0033183X
Journal	Protoplasma
Volume Number	200
Issue Number	3-4
e-ISSN	16156102
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-01-01
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Actin Cell elongation Confocal microscopy Zea mays Microfilaments Phytochrome Cell Biology Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine

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