Plant Physiol. Drug Metab Dispos
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Plant Physiology 66:990-995 (1980)
© 1980 American Society of Plant Biologists

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Articles

Promotion of Sink Activity of Developing Rose Shoots by Light 1

Yoram Mor and Abraham H. Halevy2

The Hebrew University of Jerusalem, Department of Ornamental Horticulture, Rehovot, Israel

Holding young rose shoots (Rosa hybrida cv. Marimba) in darkness while the rest of the plant was in light reduced the amount of 14C assimilates recovered from the darkened shoot by half. Relative specific activity of the shoot tip grown in light was 13.5 times greater than that of the darkened one. The flower bud at the shoot tip degenerated in darkness and died. Shoots 2 to 3 centimeters long, after flower initiation, were most sensitive to the dark treatment. The degeneration is a gradual and reversible process in the first 8 days of darkness, followed by irreversible damage and atrophy. Darkening enhanced the ability of the young leaves to compete for the available assimilates over that of the darkened shoot tip. The enhancement of the mobilizing ability of the shoot tip by light is independent of photosynthesis since spraying with 3-(3,4-dichlorophenyl)-1,1-dimethylurea or holding shoots in a CO2-free atmosphere did not diminish the promoting effect of light on flower bud development or assimilate import. The possibility that light exerts its effect by photoproduction of ATP was also excluded inasmuch as no differences were found in ATP levels of shoot tips held in darkness and those held in light.

2 To whom correspondence should be addressed.

1 This work was supported by the Pearlstein-Durftoff-Hollingsworth Funds of Research in Ornamental Horticulture, and the Ministry of Agriculture of Israel.






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