A double enhancement of greening in the cotyledons of cucumber cucumis sativus cultivar elem seedlings by excision and red light

Moran, R.; Arzee, T.; Porath, D.

Physiologia Plantarum 61(3): 455-458

1984


ISSN/ISBN: 0031-9317
DOI: 10.1111/j.1399-3054.1984.tb06355.x
Accession: 004572399

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Abstract
Cotyledons excised without the hypocotyl hook from 6-day-old etiolated cucumber (C. sativus L. cv. Elem) seedlings accumulated a significantly higher amount of chlorophyll than cotyledons excised with hooks or intact cotyledons. Maximum enhancement of greening was achieved after 2 h of dark incubation following excision. Pretreatments with red light effected an additive rise in chlorophyll level in subsequent white light after a dark incubation, suggesting that the effects of excision and phytochrome on greening act independently. Etiolated seedlings were variously dissected before greening; enhancement occurred only when cotyledons were excised at the level of the hypocotyl hook or above it. Similar results were obtained when the dissected plants were pre-treated with red light.

A double enhancement of greening in the cotyledons of cucumber cucumis sativus cultivar elem seedlings by excision and red light