四种穿刺短体线虫种群对苜蓿的致病性差异

Differential Pathogenicity of Four Pratylenchus neglectus Populations on Alfalfa.

作者信息

Griffin G D

出版信息

J Nematol. 1991 Oct;23(4):380-5.

PMID:19283142

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2619183/

Abstract

A Pratylenchus neglectus population from lltah (UT3) was more virulent to Lahontan alfalfa than other P. neglectus populations from Utah (UT1, UT2) and Wyoming (WY). All alfalfa plants survived at 24 +/- 3 C when inoculated with WY, UT1, or UT2 at initial populations (Pi) of 500, 1,000, and 5,000 nematodes per plant. At Pi 10,000 with WY, UT1, or UT2, plant mortality was 15, 15, and 20%, respectively; at Pi 5,000 and 10,000 with UT3, plant mortality was 10 and 40%. The WY, UT1, and UT2 populations reduced (P </= 0.05) root growth at Pi 10,000 only, and UT3 reduced (P </= 0.05) root growth at Pi 1,000, 5,000, and 10,000. At Pi 5,000, shoot dry weights were reduced by 10-23% by WY, 14-29% by UT1, 12-25% by UT2, and 20-48% by UT3 at 15-30 C. The UT3 population reduced (P </= 0.05) root dry weight at 20-30 C at Pi 1,000 and 5,000. The WY, UT1, and UT-2 populations did not reduce (P >/= 0.05) root growth at any temperature or Pi. The UT3 nematode reproductive indices were greater than those of the other nematode populations at all Pi and increased with temperature.

摘要

来自犹他州（UT3）的一个短体线虫种群对拉洪坦紫花苜蓿的毒性比来自犹他州（UT1、UT2）和怀俄明州（WY）的其他短体线虫种群更强。当每株接种初始种群（Pi）为500、1000和5000条线虫的WY、UT1或UT2时，所有紫花苜蓿植株在24±3℃下均存活。当Pi为10000且接种WY、UT1或UT2时，植株死亡率分别为15%、15%和20%；当Pi为5000和10000且接种UT3时，植株死亡率分别为10%和40%。WY、UT1和UT2种群仅在Pi为10000时降低（P≤0.05）根系生长，而UT3在Pi为1000、5000和10000时降低（P≤0.05）根系生长。在Pi为5000时，在15 - 30℃下，WY使地上部干重降低10 - 23%，UT1降低14 - 29%，UT2降低12 - 25%，UT3降低20 - 48%。在Pi为1000和5000时，UT3种群在20 - 30℃下降低（P≤0.05）根系干重。WY、UT1和UT - 2种群在任何温度或Pi下均未降低（P≥0.05）根系生长。在所有Pi水平下，UT3线虫的繁殖指数均高于其他线虫种群，且随温度升高而增加。