Full TGIF Record # 4299
Item 1 of 1
Web URL(s):https://academic.oup.com/aob/article/53/1/29/318900
    Last checked: 02/15/2017
    Notes: Guide page
Publication Type:
i
Refereed
Author(s):Dayanandan, P.; Kaufman, P. B.
Author Affiliation:Division of Biological Sciences, University of Michigan, Ann Arbor, MI
Title:Analysis and significance of gravity-induced asymmetric growth in the grass leaf-sheath pulvinis
Source:Annals of Botany. Vol. 53, No. 1, January 1984, p. 29-44.
# of Pages:16
Keywords:TIC Keywords: Leaves; Plant anatomy; Agrostis nebulosa; Chaetopogon fasciculatus; Lolium multiflorum; Tropisms; Leaf sheath; Grasses; Hordeum; Gravitropism; Mathematical equations
Abstract/Contents:The negative gravitropic response in the grass leaf-sheath pulvinus is a consequence of cell elongation involving all cells except those of the uppermost region of the upper flank of an horizontally oriented pulvinus. The lowermost layer of cells elongate maximally and the regions in between elongate to intermediate extents. The resulting curvatures of a responding pulvinus can be expressed mathematically by relating the angle of curvature (theta) to the original length (L0) and the max. length of the lower surface (L1) and the diam. of the organ (D), using the equation theta = (L1-L0)/D, where theta is in radians. The elongation response (S) of any individual cell within the pulvinus can be expressed by the equation, S = 0.5-r cos theta, where r is the radius of the pulvinus and theta is in degrees. Microscopic measurement of cell lengths in different regions of the pulvinus supported the mathematical predictions. Indirect support was also obtained from the use of colchicine, coumarin, dichlorobenzonitrile and isopropyl N-chlorophenyl carbamate which exaggerated the inherent asymmetry during gravitropic response. Courmarin and dichlorobenzonitrile also induced thickenings in the radial walls which appeared first in the statenchyma and later in cells located towards the outer periphery of the pulvinus. The distribution pattern of these thickenings suggested that the asymmetric growth response of the pulvinus was due to a differential and radial centrifugal transport of growth promotors from the central statenchyma region. The spp. studied were oats, barley, Agrostis nebulosa, Chaeturus fasciculatus and Italian ryegrass.
Language:English
References:16
Note:Pictures, b/w
Figures
Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dayanandan, P., and P. B. Kaufman. 1984. Analysis and significance of gravity-induced asymmetric growth in the grass leaf-sheath pulvinis. Ann. Bot. 53(1):p. 29-44.
Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=4299
If there are problems with this record, send us feedback about record 4299.
Choices for finding the above item:
Web URL(s):
https://academic.oup.com/aob/article/53/1/29/318900
    Last checked: 02/15/2017
    Notes: Guide page
Find Item @ MSU
MSU catalog number: QK 1 .A53
Find from within TIC:
   Digitally in TIC by record number.
Request through your local library's inter-library loan service (bring or send a copy of this TGIF record)