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不同致病力线虫侵染后黑松的水势和根系活力的变化

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2009年06期
Page:
53
Column:
研究论文
publishdate:
2009-11-30

Article Info:/Info

Title:
Study on the changes in the flow of water and the activity of roots system after Pinus thunbergii inoculated with Bursaphelenchus xylophilus
Author(s):
JIN Gang YE Jianren*
Jiangsu Key Laboratory for Prevention and Management of Invasive Specie, Nanjing Forestry University, Nanjing 210037, China
Keywords:
Bursaphelenchus xylophilus B.mucronatus Pinus thunbergii water potential
Classification number :
S432;S732
DOI:
10.3969/j.jssn.1000-2006.2009.06.012
Document Code:
A
Abstract:
Two Bursaphelenchus xylophilus isolates (virulent and avirulent) and one B.mucronatus isolate were inoculated separately on biennial seedlings of Pinus thunbergii. Changes in water stress and activity of roots system at different periods after inoculation were measured. The results showed that at the beginning period,the seedlings were inoculated with isolates (virulent and avirulent) and the obvious symptoms had not appeared yet, the water stress of P.thunbergii experienced a process of lowering and being back up again. But when B.xylophilus inside the seedlings began propagating in large quantities and the outer was in a wilting state, the water stress of P.thunbergii lowered at a high speed irreversibly and P.thunbergii died very soon. Compared with avirulent B.xylophilus isolate, virulent B.xylophilus isolate caused P.thunbergii to lose water much faster. After B.mucronatus isolate was inoculated, the water stress of seedlings of P.thunbergii lowered and then rose again and approached to the normal level. Along with the death of B.xylophilus, the water stress of seedlings returned to the normal state. With the invasion of B.xylophilus, the activity of roots system of P.thunbergii had a rising process. At the beginning period inoculated with B.xylophilus isolates (virulent and avirulent), though the activity of P.thunbergii had decreased somewhat, still maintained a good activity of roots system and the activity would not lose until the trunk dried out, which was different from the phenomenon that the activity of roots system was gradually lost and the plant showed the symptom of wilting caused by drought. Inoculated with B.mucronatus isolate and with the death of B.xylophilus, the activity of P.thunbergii returned to the normal state after a rising trend.

References

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Last Update: 2009-11-30