COLD ACCLIMATION OF FORTUNE × ENCORE, LEE × NOVA, AND TUNIS × SUCCARI ON RANGPUR × SWINGLE, SUN CHU SHA, AND SUNKI × BENEKE CITRUS ROOTSTOCKS

YELENOSKY, G.

Abstract


Nine experimental citrus scion/rootstock combinations were freeze tested as 1-year-old trees in pots during a series of tests in controlled temperature rooms. Results suggest that Lee × Nova, closely followed by Tunis × Succari, cold acclimate better than Fortune × Encore. Best freeze survival was achieved on Sun Chu Sha followed by Sunki × Beneke, and Rangpur × Swingle rootstocks. Best acclimation occurred at the lowest acclimation temperatures. Occasionally, experimental trees cold acclimated as well as 'Valencia' on Swingle citrumelo. Trees cold acclimated better with than without leaves. Cold acclimation that was gained during five weeks of cold acclimation was lost during three days of dehardening under greenhouse conditions. All trees demonstrated supercooling well below lethal temperatures, and the start of ice forming in the trees was noted most often after -4ºC. Fortune × Encore and Lee × Nova on Sun Chu Sha were some of the best developed trees, whereas Tunis × Succari on Rangpur × Swingle and Sunki × Beneke rootstocks were the smallest.

Keywords


freeze tolerance; cold hardiness; citrus hybrids; nucleation temperatures; exotherms; freeze damage

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283