RAPID, BILATERAL CHANGES IN GROWTH-RATE AND CURVATURE DURING GRAVITROPISM OF CUCUMBER HYPOCOTYLS - IMPLICATIONS FOR MECHANISM OF GROWTH-CONTROL

被引:29
作者
COSGROVE, DJ
机构
[1] Department of Biology, Mueller Laboratory, Pennsylvania State University, University Park, Pennsylvania
关键词
cell expansion; Cucumis sativus L.: gravitropism; growth kinematics; hypocotyl (cucumber);
D O I
10.1111/j.1365-3040.1990.tb01307.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Abstract. The growth response of etiolated cucumber (Cucumis sativus L.) hypocotyls to gravitropic stimulation was examined by means of time‐lapse photography and high‐resolution analysis of surface expansion and curvature. In comparison with video analysis, the technique described here has five‐ to 20‐fold better resolution; moreover, the mathematical fitting method (cubic splines) allows direct estimation of local and integrated curvature. After switching seedlings from a vertical to horizontal position, both upper and lower surfaces of the stem reacted after a lag of about 11 min with a two‐ to three‐fold increase in surface expansion rate on the lower side and a cessation of expansion, or slight compression, on the upper surface. This growth asymmetry was initiated simultancously along the length of the hypocotyl, on both upper and lower surfaces, and did not migrate basipetally from the apex. Later stages in the gravitropic response involved a complex reversal of the growth asymmetry, with the net result being a basipetal migration of the curved region. This secondary growth reversal may reflect oscillatory and or self‐regulatory behaviour of growing cells. With some qualifications, the kinetics and pattern of growth response are consistent with a mechanism involving hormone redistribution, although they do not prove such a mechanism. The growth kinetics require a growth mechanism which can be stimulated by two‐to three‐fold or completely inhibited within a few minutes. Copyright © 1990, Wiley Blackwell. All rights reserved
引用
收藏
页码:227 / 234
页数:8
相关论文
共 33 条
[1]  
ATKINSON LV, 1983, INTRO NUMERICAL METH
[2]   DISTRIBUTION AND REDISTRIBUTION OF EXTENSION GROWTH ALONG VERTICAL AND HORIZONTAL GRAVIREACTING MAIZE ROOTS [J].
BARLOW, PW ;
RATHFELDER, EL .
PLANTA, 1985, 165 (01) :134-141
[3]   CAN LATERAL REDISTRIBUTION OF AUXIN ACCOUNT FOR PHOTOTROPISM OF MAIZE COLEOPTILES [J].
BASKIN, TI ;
BRIGGS, WR ;
IINO, M .
PLANT PHYSIOLOGY, 1986, 81 (01) :306-309
[4]   HIGH-RESOLUTION MEASUREMENT OF GROWTH DURING 1ST POSITIVE PHOTOTROPISM IN MAIZE [J].
BASKIN, TI ;
IINO, M ;
GREEN, PB ;
BRIGGS, WR .
PLANT CELL AND ENVIRONMENT, 1985, 8 (08) :595-603
[5]   MECHANISM OF RAPID SUPPRESSION OF CELL EXPANSION IN CUCUMBER HYPOCOTYLS AFTER BLUE-LIGHT IRRADIATION [J].
COSGROVE, DJ .
PLANTA, 1988, 176 (01) :109-116
[6]   RAPID SUPPRESSION OF GROWTH BY BLUE-LIGHT - OCCURRENCE, TIME COURSE, AND GENERAL-CHARACTERISTICS [J].
COSGROVE, DJ .
PLANT PHYSIOLOGY, 1981, 67 (03) :584-590
[7]   CELL-WALL YIELD PROPERTIES OF GROWING TISSUE - EVALUATION BY INVIVO STRESS-RELAXATION [J].
COSGROVE, DJ .
PLANT PHYSIOLOGY, 1985, 78 (02) :347-356
[8]   GRAVITROPISM OF CUCUMBER HYPOCOTYLS - BIOPHYSICAL MECHANISM OF ALTERED GROWTH [J].
COSGROVE, DJ .
PLANT CELL AND ENVIRONMENT, 1990, 13 (03) :235-241
[9]  
Digby J., 1979, Plant, Cell and Environment, V2, P145, DOI 10.1111/j.1365-3040.1979.tb00785.x
[10]  
Firn R. D., 1979, Plant, Cell and Environment, V2, P149, DOI 10.1111/j.1365-3040.1979.tb00786.x