Temperature and Cytokinin Relationships on Lettuce (Lactuca sativa L.) and Celery (Apium graveolens L.) Nursery Growth and Yield

Araki, Andrés; Rattin, Jorge; Di Benedetto, Adalberto; Miravé, Patricio
November 2007
International Journal of Agricultural Research;2007, Vol. 2 Issue 8, p725
Academic Journal
The use of small containers for improving lettuce and celery propagation may cause root restriction which is a physical stress imposed on the root system which leads to a pronounced decrease in both root and shoot growth of the plants. Although a cytokinin decrease and root restriction relationship has been previously suggested, the physiological and biochemical processes involved are largely unknown. The following research was undertaken to show the effect of cytokinin sprays on both lettuce and celery plug nursery dry weight accumulation under a wide range of temperature and commercial yield under the summer-autumn cycle. Dry weight increase in response to a temperature increase for lettuce and celery seedlings during nursery; the better results when cytokinins were sprayed were found. The use of pre-transplant cytokinin sprays increased yield but the same doses, two weeks after the transplant, decreased it. The effects were higher for lettuce than for celery. The relationship between the cytokinins synthesis and translocations and leaf growth were discussed.


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