150
LUISE STANGE
differentiation into the gametophytic and sporophytic stage in bryophytes and pteridophytes is greatly influenced by external conditions
(e.g. Whittier and Steeves, 1960; Bristow, 1962 ; Bauer, 1963 ; Lai, 1963).
Both ways, the study of external influences on the type of differentiation
and investigations on the occurrence and the nature of stable differentiation, will lead to a better understanding of the mechanisms underlying
the control of differentiation into gametophyte or sporophyte.
V. Concluding Remarks
In all investigations included in this chapter, induction of regeneration has been used as a method to study morphogenetic problems. The
opportunities offered by lower plants for research in this field became
specially clear in discussing the process of embryonization. The high
capacity of lower plants for regeneration and their simple construction
facilitate experimental arrangements and evaluation of the reaction of
single cells as well as whole organs or parts. In lower plants, furthermore,
the relatively easy switching of the process of differentiation to such
different courses as gametophytic and sporophytic development presents possibilities of studying the mechanism of differentiation not
realized in higher plants. Intensive research in plant morphogenesis,
using lower plants as experimental objects and induction of regeneration
as a method, was carried out at the end of the last and in about the first
thirty years of this century. This fact is reflected in the relatively large,
but still incomplete, number of references from that period cited in this
chapter. In the last three decades, investigations in plant morphogenesis have been concerned predominately with the effects of external
influences and physiologically active substances on plant development.
However, as has been demonstrated in this chapter, research on regeneration in lower plants has been reactivated in recent years. It is
hoped that in the future this activity will be extended, since it can be
expected that through combination of the old method of interrupting
internal relations in the plant and an examination of the reactions by
modern methods, insight can be gained into the nature of correlations so
important for plant development.
Acknowledgements
The author is indebted to Professors L. Bauer, M. Bopp, M. Ito, and
K. E. von Maltzahn for their kind permission to use Figures or Tables
from their publications for this chapter, and wishes to thank Dr. C. A.
Barlow for reviewing the English text.
LUISE STANGE
differentiation into the gametophytic and sporophytic stage in bryophytes and pteridophytes is greatly influenced by external conditions
(e.g. Whittier and Steeves, 1960; Bristow, 1962 ; Bauer, 1963 ; Lai, 1963).
Both ways, the study of external influences on the type of differentiation
and investigations on the occurrence and the nature of stable differentiation, will lead to a better understanding of the mechanisms underlying
the control of differentiation into gametophyte or sporophyte.
V. Concluding Remarks
In all investigations included in this chapter, induction of regeneration has been used as a method to study morphogenetic problems. The
opportunities offered by lower plants for research in this field became
specially clear in discussing the process of embryonization. The high
capacity of lower plants for regeneration and their simple construction
facilitate experimental arrangements and evaluation of the reaction of
single cells as well as whole organs or parts. In lower plants, furthermore,
the relatively easy switching of the process of differentiation to such
different courses as gametophytic and sporophytic development presents possibilities of studying the mechanism of differentiation not
realized in higher plants. Intensive research in plant morphogenesis,
using lower plants as experimental objects and induction of regeneration
as a method, was carried out at the end of the last and in about the first
thirty years of this century. This fact is reflected in the relatively large,
but still incomplete, number of references from that period cited in this
chapter. In the last three decades, investigations in plant morphogenesis have been concerned predominately with the effects of external
influences and physiologically active substances on plant development.
However, as has been demonstrated in this chapter, research on regeneration in lower plants has been reactivated in recent years. It is
hoped that in the future this activity will be extended, since it can be
expected that through combination of the old method of interrupting
internal relations in the plant and an examination of the reactions by
modern methods, insight can be gained into the nature of correlations so
important for plant development.
Acknowledgements
The author is indebted to Professors L. Bauer, M. Bopp, M. Ito, and
K. E. von Maltzahn for their kind permission to use Figures or Tables
from their publications for this chapter, and wishes to thank Dr. C. A.
Barlow for reviewing the English text.