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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (9): 2453-2463.doi: 10.16420/j.issn.0513-353x.2024-0514

• Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Bud Overwintering Freezing and Shading for Bud Survival of Sweet Cherries in Low-Latitude and High-Altitude Regions

LIU Rui’e1, SUN Wanxia1, WANG Li1, NONG Honglin1, QIU Minghua2, YU Fei2, ZHANG Qijing3, ZHANG Caixi1,*()   

  1. 1 School of Agriculture and BiologyShanghai Jiao Tong University, Shanghai 200240, China
    2 Horticultural Research Institute Yunnan Academy of Agricultural Sciences, Kunming 650000, China
    3 Liaoning Institute of PomologyLiaoning, Yingkou 115009, China
  • Received:2025-05-08 Revised:2025-06-24 Online:2025-09-25 Published:2025-09-24
  • Contact: ZHANG Caixi

Abstract:

Based on 3 sweet cherry cultivars,i.e.,‘Hongdeng’‘Tieton’and‘Russia 8’,planted in Shangri-La,Yunnan Province,this study firstly pointed out the key phenology of sweet cherry in low-latitude with high-altitude regions and showed the flower bud overwintering freezing damage. Importantly,the effects of shading facilities on reducing the risk of freezing damage were also studied. The results show that sweet cherry trees in Shangri-La fall leaves in October and enter dormant period in early November. The full blooming date is early May and the fruit maturity period is mid-July,demonstrating 30-50 days later phenology compared to other major sweet cherry cultivation regions. In addition,this study revealed a linear correlation between daily minimum temperature and the freezing damage rate of flower buds(R2 = 0.91). The model estimated that the half-lethal temperature of flower buds during dormancy is-14.7 ℃,with daily minimum temperatures below to-18.2 ℃ causing 95% bud mortality. Severe freezing damage occurred after endodormancy release,showing average bud freezing damage rates of 51.0%(‘Russia 8’)to 57.1%(‘Tieton’). Shading effectively elevate minimum temperatures by 2.7-3.9 ℃ compared to open-field conditions during dormancy,resulting in the average freezing damage rate decreased by 23.7%,when‘Tieton’flower bud endodormancy was released.

Key words: cherry, phenology, freezing damage, shading treatment, Shangri-La