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Impaired chlorophyll formation in etiolated cucumber cotyledons following prolonged dark incubation after red light pretreatment
Author(s) -
Cohen Lila,
Arzee Tova
Publication year - 1984
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.1399-3054.1984.tb06078.x
Subject(s) - incubation , etiolation , cucumis , chlorophyll , greening , incubation period , biology , botany , far red , darkness , horticulture , red light , biochemistry , ecology , enzyme
Red light (R) pretreatment of etiolated cucumber seedlings ( Cucumis sativus L. var. Elem) followed by prolonged dark incubation prior to white light (WL) exposure, had an adverse effect on the greening of the cotyledons. The effect was photoreversible by far‐red (FR) light. Cotyledons which were dark incubated for 24 h following the R pulse greened more rapidly when exposed to WL than did the controls, while total chlorophyll (Chl) accumulation after 24 h in the light was about the same in both. However, after 48 h post‐R dark incubation greening of the treated cotyledons was delayed, and their amount of Chl which accumulated after 24 h WL was about one half of that in non‐treated seedlings. As the length of the post‐R dark incubation period was extended Chl production became slower, so that after 96 h post‐R dark incubation the Chl level in the treated cotyledons after 24 h WL was approximately 20% of the controls. No significant differences in amounts of protochlorophyll could be detected between seedlings preilluminated with R or R followed by FR. Seedlings 4‐, 5‐ and 6‐days‐old at the time of R treatment showed similar degrees of impaired Chl synthesis following prolonged post‐R dark incubation.