INFLUENCE OF TEMPERATURE ON CITRUS ROOTSTOCK SEED EMERGENCE

WILTBANK, W. J.

Abstract


Seeds of four citrus cultivars commonly-used for rootstocks, 'Pineapple' sweet orange (Citrus sinensis L. Osbeck), sour orange (C. aurantium L.), trifoliate orange (Poncirus trifoliata L. Raf.), and rough lemon (C. jambhiri Lush) were germinated at temperatures ranging from 4.4º to 37.8ºC using a temperature gradient bar. Seedcoat removal reduced the time necessary for germination, increased the range of temperatures at which germination occurred, but did not affect the optimum temperature for germination. The optimum temperatures for germination agreed with previous research but the minimum temperatures did not. Rough lemon germinated at lower temperatures than sweet orange and sour orange. Trifoliate orange seed germination occurred at the lowest temperatures.

Keywords


germination; temperature

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