Assessment of Rubber Clonal Rootstocks for the Tolerance of White Root Disease (Rigidoporus microporus) in Southern Thailand



Screening of rubber rootstocks that prevail good preference of plant growth with tentative tolerance of white root disease was done in southern Thailand. Seven selected clonal rootstocks and the major cultivated clone: RRIM 600 were grown in rhizoboxes (1 plant/1 rhizobox). An experiment was designed as an 8×2 factorial laid out in completely randomized design with the treatments comprised of 8 clones and 2 treatments of control and inoculation in 3 replicates. The experimental period was 24 weeks, the data of root distributions, growth, physiological responses and symptoms of rubber seedlings were recorded at 2-week intervals. After 24 weeks, the controlled clone EIRpsu 5 exhibited the highest shoot growth compared with the inoculum treatment clones. Root length density was accessed by scanning the root profile of each seedling from the panel of the rhizobox, it was found that the control treatment of the EIRpsu 1, EIRpsu 3, EIRpsu 4 and EIRpark clones had a high portion of root proliferation at 20 - 40 cm deep from the soil surface. The clone EIRpsu 5 exhibited the highest average root length density and the inoculum treatments of the EIRpsu 1, EIRpsu 2, EIRpsu 3 and RRIM 600 clones had high extension root growth at 0 - 20 cm deep. To investigate the physiological responses, the clone EIRpsu 5 showed the highest efficiency of photosynthetic rate with high stomatal conductance. According to the assessment of the disease index, it was found that the clone EIRpsu 4 exhibited the highest susceptibility score (54.09 %). Whereas, the lowest score was found in the clone EIRpsu 5 (12.12 %). This indicated that the clone EIRpsu 5 tended to be tolerant of white root disease with good performance of plant growth.


Rigidoporus microporus, rootstock, physiological responses, disease index, white root disease

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