%A Lulong Sun, Qingwei Geng, Hao Xing, Yuanpeng Du, Heng Zhai %T Effects of Buffered Cooling in Root Zone on Frost Injury in Grape Leaf %0 Journal Article %D 2017 %J Chinese Bulletin of Botany %R 10.11983/CBB16097 %P 290-296 %V 52 %N 3 %U {https://www.chinbullbotany.com/CN/abstract/article_3137.shtml} %8 2017-05-01 %X

To study the effects of cooling conditions in the root zone on frost injury in grapevine leaves, we used 1-year-old Merlot grapevine (Vitis vinifera) seedlings. The root zone was cooled regularly or buffered. All seedlings were treated in the simulated frost condition, then the frost index in leaves was calculated, and the chlorophyll fluorescence parameters were analyzed to reflect the change of PSII activity. Root temperature cooled regularly conferred severe frost damage in leaves, with a frost index of 74.36%. Buffered cooling alleviated frost injury to 53.29%, with a frost index of only 21.07%. Buffered cooling in the root zone improved qP and Fvʹ/Fmʹ in leaves during the recovery period, sped up the recovery of photochemical activity in PSII (ΦPSII), improved the ability of heat dissipation (NPQ), and relieved photo- inhibition. Buffered cooling in the root zone was conducive for leaves to recover after frost.