Pathogenicity of Pratylenchus brachyurus to rubber rootstocks

The pathogenicity of Pratylenchus brachyurusto rubber (Hevea brasiliensis) rootstocks was studied in two experiments: 1) opencross seedlings of 'Tjir 1' x 'Tjir 16' were inoculated with zero, 7,700 or 23,100 nematodes per plant; 2) illegitimate seedlings of 'GT 1', 'RRIM 527' and 'RRIM 600' were inoculated with zero or 12,800 nematodes per plant. After 195 (1st experiment) or 105 days after inoculation (2nd experiment), P. brachyurusdid not affect the relative growth percentage in terms of plant height in both experiments but significantly diminished the stem diameter percentage and increased the stomatal resistance of 'GT 1' , 'RRIM 527' and 'RRIM 600'.

本研究通过两项试验探究了短尾短体线虫（Pratylenchus brachyurus）对巴西橡胶树（Hevea brasiliensis）砧木的致病性。试验1以‘Tjir 1’בTjir 16’的开放授粉实生苗为供试材料，每株分别接种0、7700或23100条该线虫；试验2以‘GT 1’、‘RRIM 527’及‘RRIM 600’的非合法授粉实生苗为供试材料，每株分别接种0或12800条该线虫。接种后195天（试验1）或105天（试验2）取样检测结果显示，两项试验中短尾短体线虫均未对植株株高相对生长百分率产生显著影响，但显著降低了‘GT 1’、‘RRIM 527’与‘RRIM 600’的茎径相对生长百分率，并显著提高了其气孔阻力。