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Chilling and Heat Requirements of Main Cultivars of Ping'ou Hybrid Hazelnuts (Corylus heterophylla×Corylus avellana)

  • Received Date: 2015-09-24
  • [Objective] To reveal the chilling and heat requirements of main cultivars of Ping'ou hybrid hazelnuts.[Method] The hydroponic experiments were carried out with excised annual shoots of 16 main cultivars of Ping'ou hybrid hazelnuts (Corylus heterophylla×C. avellana) as materials and excised annual shoots of the wild hazelnut (C. heterophylla Fisch.) as the control. The chilling and heat requirements were estimated by the observation of the phenological phase of the catkins, female inflorescences and leaf buds.[Result] There were great differences in the chilling requirements and the heat requirements among different organs of Ping'ou hybrid hazelnuts. The chilling requirements ranged 336~1176 h for catkins, 504~1344 h for female inflorescences and 672~1512 h for leaf buds. The heat requirements ranged 687.0~998.5 GDH℃ for catkins, 998.5~3496.1 GDH℃ for female inflorescences and 2546.5~4180.3 GDH℃ for leaf buds. When the cultivars and organs reach the minimum chilling requirements, the heat requirements were at the highest value. With the extension of the cold accumulation, the heat requirements reduced gradually.[Conclusion] This is the first report of research on the chilling and heat requirements for different organs of Ping'ou hybrid hazelnuts. As for chilling requirement, some cultivars such as Dawei and Ping'ou 48 showed lower-level chilling requirements, and some others such as Liaozhen No.2 and Ping'ou 545 showed higher-level chilling requirements. As for heat requirement, some cultivars such as Yuzhui and Ping'ou 69 showed lower-level heat requirements and some others such as Liaozhen No.1 and Liaozhen No.4 showed higher-level heat requirements. The data above enriched the information in the flowering and dormancy releasing of Corylus, which could provide reference for the breeding introduction and cultivation of Ping'ou hybrid hazelnuts.
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Chilling and Heat Requirements of Main Cultivars of Ping'ou Hybrid Hazelnuts (Corylus heterophylla×Corylus avellana)

  • 1. Research Institute of Forestry, Chinese Academy of Forestry, Key Laboratory of Tree Breeaing and Cultivation, State Forestry Administration, State Key Laboratory of Tree Genetics and Breeding, Beijing 100091, China
  • 2. Institute of Afforestation and Sand Control, Xinjiang Academy of Forestry Sciences, Urumqi 830063, Xinjiang, China
  • 3. Bureau of Mulanweichang National Forest Farm of Hebei Province, Chengde 068450, Hebei, China

Abstract: [Objective] To reveal the chilling and heat requirements of main cultivars of Ping'ou hybrid hazelnuts.[Method] The hydroponic experiments were carried out with excised annual shoots of 16 main cultivars of Ping'ou hybrid hazelnuts (Corylus heterophylla×C. avellana) as materials and excised annual shoots of the wild hazelnut (C. heterophylla Fisch.) as the control. The chilling and heat requirements were estimated by the observation of the phenological phase of the catkins, female inflorescences and leaf buds.[Result] There were great differences in the chilling requirements and the heat requirements among different organs of Ping'ou hybrid hazelnuts. The chilling requirements ranged 336~1176 h for catkins, 504~1344 h for female inflorescences and 672~1512 h for leaf buds. The heat requirements ranged 687.0~998.5 GDH℃ for catkins, 998.5~3496.1 GDH℃ for female inflorescences and 2546.5~4180.3 GDH℃ for leaf buds. When the cultivars and organs reach the minimum chilling requirements, the heat requirements were at the highest value. With the extension of the cold accumulation, the heat requirements reduced gradually.[Conclusion] This is the first report of research on the chilling and heat requirements for different organs of Ping'ou hybrid hazelnuts. As for chilling requirement, some cultivars such as Dawei and Ping'ou 48 showed lower-level chilling requirements, and some others such as Liaozhen No.2 and Ping'ou 545 showed higher-level chilling requirements. As for heat requirement, some cultivars such as Yuzhui and Ping'ou 69 showed lower-level heat requirements and some others such as Liaozhen No.1 and Liaozhen No.4 showed higher-level heat requirements. The data above enriched the information in the flowering and dormancy releasing of Corylus, which could provide reference for the breeding introduction and cultivation of Ping'ou hybrid hazelnuts.

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