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SUPERCOOLING IN FLORAL BUDS OF < DANKA > BLACK AND < RED LAKE > RED CURRANTS.

Author(s) : WARMUND M., GEORGE M., TAKEDA F.

Type of article: Article

Summary

DIFFERENTIAL THERMAL ANALYSES (DTA) AND FREEZE VIABILITY TESTS WERE CONDUCTED TO INVESTIGATE THE BIOPHYSICS OF FREEZING IN FLORAL BUDS OF < DANKA > BLACK (RIBES NIGRUM L) AND < LAKE > RED CURRANTS (RIBES SATIVUM, RCHD, SYME) SAMPLED FROM NOVEMBER 1989 THROUGH MARCH 1990. SCANNING ELECTRON MICROSCOPY WAS ALSO USED TO DETERMINE THE RELATIONSHIP BETWEEN FLORAL MORPHOLOGY AND THE FREEZING CHARACTERISTICS OF THE BUDS. FLORAL BUDS HAD MULTIPLE ABRUPT LOW-TEMPERATURE EXOTHERMS (LTES) AND ONE OR TWO BROAD LTES IN DTA TESTS. ABRUPT LTES FROM DTA WERE ASSOCIATED WITH APPARENT INJURY TO THE INFLORESCENCE IN VIABILITY TESTS. THE NUMBER OF LTES DID NOT CORRESPOND TO THE NUMBER OF RACEMES OR FLOWERS PER BUD, INDICATING THAT SEVERAL FLOWERS FROZE SIMULTANEOUSLY. DTA EXPERIMENTS CONDUCTED IN DECEMBER 1990 REVEALED THAT THE BROAD EXOTHERM DETECTED BETWEEN -14 AND -20 DEG C IN < DANKA > SAMPLES RESULTED FROM FREEZING OF SUPERCOOLED WATER IN THE E ATTACHED TO THE BUD.

Details

  • Original title: SUPERCOOLING IN FLORAL BUDS OF < DANKA > BLACK AND < RED LAKE > RED CURRANTS.
  • Record ID : 1992-1162
  • Languages: English
  • Source: J. am. Soc. hortic. Sci. - vol. 116 - n. 6
  • Publication date: 1991/11
  • Document available for consultation in the library of the IIR headquarters only.

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