Germination Response of Seeds of Aconitum grossedentatum (Ranunculaceae) to Temperature and its Significance to the Expansion of the Distribution

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Germination response of seeds of Aconitum grossedentatum to temperature was analyzed and its significance to the distribution of the genus is discussed. The underdeveloped embryo in ripe seeds grew at constant temperatures of 5 and 10℃, but did not grow at a constant temperature of 0℃. Seeds at a constant 5℃ germinated gradually, but did not germinate at a constant 10℃. At 10℃ embryos became dormant after growing to about 2mm in length. Stratification at 0℃ of seeds incubated at a constant 10℃ resulted in synchronous germination. The germination responses to temperature fit well the annual changes in temperature in the habitat of A. grossedentatum. It is presumed that seeds need a period of one and a half years for germination in nature. Response of the developing cotyledons to temperature in early spring may be a controlling factor in the spread of the species by seeds.
2004-08-25