Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2020, Vol. 41 ›› Issue (3): 474-481.DOI: 10.3969/j.issn.1000-2561.2020.03.008

• Phytophysiology and Biochemistry • Previous Articles     Next Articles

Stimulation Technology and Adaptability of d6 Tapping System for Mid-aged Hevea Clone PR107 and Reyan 7-33-97

QIU Jian,XIAO Xianzhou,GAO Honghua,YANG Wenfeng,WEI Fang,WU Ming,LUO Shiqiao()   

  1. Key Laboratory of Biology and Genetic Resources of Rubber Tree, Ministry of Agriculture and Rural Affairs / State Key Laboratory Incubation Base for Cultivation & Physiology of Tropical Crops / Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
  • Received:2019-07-18 Revised:2019-08-27 Online:2020-03-25 Published:2020-04-16
  • Contact: LUO Shiqiao


Taking middle-aged PR107 and Reyan 7-33-97 as the research objects, treatment with five stimulation time (1, 2, 3, 4, 5 d before tapping) was set up, and the effects on the latex yield under the d6 tapping system were compared. The d4 tapping system was used as the control, and six treatment of the d6 tapping system with different stimulation intensity (including four concentrations of ethephon and three simulation frequencies under the highest concentration) was set up on the middle-aged PR107 and Reyan 7-33-97. The yield, latex physiology and the occurrence of TPD were analyzed. The optimal latex yield was obtained when ethephon was applied on the 2nd day after the last tapping or the 2nd to 3rd day of the first tapping in one stimulation cycle. The rubber-producing potential of the d6 tapping for middle-aged PR107 was difficult to be exploited through moderate stimulation. The stimulation strategy of 4% ethephon combined with 2 or 3 tapping intervals of stimulation frequency was able to obtain relatively good yield and physiological effects. While the d6 tapping system was practical in Reyan 7-33-97, the low stimulation intensity of 2.0%-2.5% ethephon combined with 2 or 3 tapping intervals of stimulation frequency could achieve a high yield, and maintain a good physiological response of laticifer. Annual variation of dry rubber yield (kilogram per tree per tapping, kg/t/t) showed that the d6 tapping system had an obvious high-yielding period (after Oct.) and the mean dry rubber yield (kg/t/t) in high-yielding months accounted for 3.0% to 4.8% of the annual production. Therefore, to ensure the tapping number in high yield period is key for a stable yield of the d6 tapping system.

Key words: Hevea brasiliensis, clone PR107, Reyan 7-33-97, d6 tapping system, stimulation technology

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