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The stimulating effect of a cold dark‐pretreatment on the etioplast/chloroplast transformation of angiosperms. III. Involvement of the excision factor and of cold‐retarded aging processes?
Author(s) -
Schönbohm Ekkehard,
Babbel Ute,
CzeskaWerner Ulrike,
Zellner Sebastian,
Zwicker HansGeorg
Publication year - 1994
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1994.tb00432.x
Subject(s) - gibberellic acid , senescence , chlorophyll , botany , chloroplast , etiolation , cytokinin , biology , chemistry , horticulture , biochemistry , microbiology and biotechnology , gene , auxin , germination , enzyme
Our question is whether the stimulating effect of a cold dark‐pretreatment on the process of de‐etiolation in primary leaves of wheat seedlings under subsequent continuous white light is essentially mediated by the retarding effect of highly lowered temperatures on the following processes: aging and/or senescence, realization of the so‐called excision factor in detached leaves, decrease of the cytokinin level in detached leaves. The strong stimulating effect of a cold dark‐preatreatment remains inspite of progressive aging in parts of the leaves and a strong decrease of the capability of chlorophyll accumulation in detached in contrast to attached leaves. The strong stimulatory effect of a cold dark‐pretreatment is not diminished by application of cytokinin or gibberellic acid. The stimulating effect of a cold dark‐pretreatment is detectable over several days under continuous light, but it is lost during a warm dark‐phase of a few hours duration between the cold dark‐pretreatment and the white light phase.