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EFFECTS OF LOW TEMPERATURE, COOLING RATE, AND MOISTURE CONTENT ON SEED GERMINATION OF LETTUCE.

Author(s) : ROOS E. E., STANWOOD P. C.

Type of article: Article

Summary

SEEDS OF 5 CULTIVARS OF LETTUCE (LACTUCA SATIVA L.) WERE ADJUSTED TO MOISTURE CONTENTS BETWEEN 5 AND 22% AND SUBJECTED TO TEMPERATURES OF 278, 255, 203 AND 77 K (5, -18, -70 AND -196.C) (LIQUID NITROGEN) FOR 7 DAYS. SEEDS WITH MOISTURE CONTENTS UP TO 18% WERE NOT DAMAGEDBY EITHER 255 OR 77 K; HOWEVER, THE 203 K TREATMENT RESULTED IN LOSS OF GERMINATION EVEN WITH SEEDS CONTAINING AS LITTLE AS 16% MOISTURE. SEEDS HELD AT 278 K SHOWED NO LOSS IN VIABILITY. THE LOSS IN GERMINATION AT 203 K APPEARED TO BE RELATED TO COOLING RATE. HIGH MOISTURE (18 TO 20%) SEEDS WERE COOLED TO 77 K AT DIFFE-RENT RATES FROM 1 TO 200K/MIN (1 TO 200.C/MIN). GERMINATION WAS REDUCED IN SEEDS COOLED AT RATES SLOWER THAN 25 K/MIN (25.C/MIN). AT 200 K/MIN (200.C/MIN) COOLING RATE AND 18 TO 20% SEED MOISTURE BOTH GERMINATION AND ROOT GROWTH OCCURRED ALTHOUGH AT REDUCED LEVELS COMPARED WITH CONTROL SEEDS HELD AT 278 K. PROLONGED STORAGE (33 DAYS) IN LIQUID DS DID NOT RESULT IN FURTHER LOSS OF GERMINATION AFTER THE INITIAL FREEZING TO 77 K.

Details

  • Original title: EFFECTS OF LOW TEMPERATURE, COOLING RATE, AND MOISTURE CONTENT ON SEED GERMINATION OF LETTUCE.
  • Record ID : 1982-0100
  • Languages: English
  • Source: J. am. Soc. hortic. Sci. - vol. 106 - n. 1
  • Publication date: 1981
  • Document available for consultation in the library of the IIR headquarters only.

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