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Dormancy and germination responses of kiwifruit (Actinidia deliciosa) seeds to environmental cues

Published online by Cambridge University Press:  04 October 2016

Liliana B. Windauer ,
Pedro Insausti ,
Fernando Biganzoli ,
Roberto Benech-Arnold  and
Miriam M. Izaguirre
Liliana B. Windauer
Affiliation:
Cátedra de Fruticultura Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE Buenos Aires, Argentina
Pedro Insausti
Affiliation:
Cátedra de Fruticultura Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE Buenos Aires, Argentina IFEVA, Facultad de Agronomía – Universidad de Buenos Aries – CONICET, Avenida San Martín 4453, C1417DSE Buenos Aires, Argentina
Fernando Biganzoli
Affiliation:
Departamento de Métodos Cuantitativos y Sistemas de Información, Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE Buenos Aires, Argentina
Roberto Benech-Arnold
Affiliation:
IFEVA, Facultad de Agronomía – Universidad de Buenos Aries – CONICET, Avenida San Martín 4453, C1417DSE Buenos Aires, Argentina Cátedra de Cultivos Industriales Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE Buenos Aires, Argentina
Miriam M. Izaguirre*
Affiliation:
Cátedra de Fruticultura Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE Buenos Aires, Argentina
*
*Correspondence Email: izaguirr@agro.uba.ar
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Abstract

Seed germination of the kiwifruit (Actinidia deliciosa A. Chev. C.F. Liang and A.R. Ferguson), a deciduous, perennial vine, is low because of seed dormancy. The main purpose of this study was to characterize kiwifruit seed dormancy and germination in response to environmental factors such as temperature and light. Dormancy of hydrated seeds is alleviated by the perception of a period at low temperatures (stratification) of at least 3 weeks at 2 or 5°C. Alleviation of dormancy is accomplished by incubation at fluctuating temperatures (20/30°C). A red light pulse did not affect germination, whereas a far-red light pulse strongly inhibited germination. This inhibition was readily reverted by a second pulse of red light, indicating that phytochromes are also involved in dormancy alleviation. Although seed germination was inhibited by the fruit pulp, the latter prevented neither perception of low temperature nor changes in the light sensitivity of the seeds. Therefore, it can be advanced that kiwifruit seeds will only germinate after dispersal if the time–temperature requirement for dormancy alleviation and fluctuating temperatures for dormancy termination are fulfilled. Perception of a closed canopy might interfere with dormancy termination.

Keywords

Actinidia deliciosafluctuating temperatureslightmaternal tissuesred/far-red ratioseed dormancystratification

Information

Type
Research Papers
Information
Seed Science Research , Volume 26 , Issue 4 , December 2016 , pp. 342 - 350
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Copyright
Copyright © Cambridge University Press 2016 

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