THE POLARITY OF GRAVITROPISM IN THE MOSS PHYSCOMITRELLA-PATENS IS REVERSED DURING MITOSIS AND AFTER GROWTH ON A CLINOSTAT

被引：18

作者：

KNIGHT, CD

COVE, DJ

机构：

[1] Department of Genetics, University of Leeds, Leeds

来源：

PLANT CELL AND ENVIRONMENT | 1991年 / 14卷 / 09期

关键词：

GRAVITROPISM; PHYSCOMITRELLA-PATENS; MITOSIS; CLINOSTAT;

D O I：

10.1111/j.1365-3040.1991.tb00970.x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

We report two situations in which the polarity of gravitropism of single protonemal cells of the moss Physcomitrella patens is reversed. Dark-grown protonemata of wild-type P. patens grow negatively gravitropically. Time-lapse video-microscopy reveals that a temporary reversal of growth polarity occurs during mitotic division which is independent of the cells' growth rate. A transitory reversal of growth direction is also observed when the uni-directional gravitropic stimulus is interrupted by a period of growth on a clinostat. A third situation, in which a mutant class responds by growing positively gravitropically, has been described previously (Jenkins, Courtice & Cove, 1986). These observations are discussed in terms of possible mechanisms for cell morphogenesis and tropic growth.

引用

页码：995 / 1001

页数：7

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