<abstract xmlns="http://www.w3.org/1999/xhtml">

<p><italic>Pasteuria penetrans</italic> is considered as the primary agent responsible for soil suppressiveness to root-knot nematodes widely distributed in many agricultural fields. A preliminary survey on a <italic>Pittosporum tobira</italic> field where the grower had experienced a continuous decline in productivity caused by <italic>Meloidogyne incognita</italic> showed that the nematode was infected with <italic>Pasteuria penetrans</italic>. For effective control of the nematode, the bacterium and the host must coexist in the same root zone. The vertical distribution of <italic>Pasteuria penetrans</italic> and its relationship with the nematode host in the soil was investigated to identify (i) the vertical distribution of
<italic>P. penetrans</italic> endospores in an irrigated <italic>P. tobira</italic> field and (ii) the relationship among <italic>P. penetrans</italic> endospore density, <italic>M. incognita</italic> J2 population density, and host plant root distribution over time. Soil bioassays revealed that endospore density was greater in the upper 18 cm of the top soil compared with the underlying depths. A correlation analysis showed that the endospore density was positively related to the J2 population density and host plant root distribution. Thus, the vertical distribution of <italic>P. penetrans</italic> was largely dependent on its nematode host which in turn was determined by the distribution of the host plant roots. The <italic>Pasteuria</italic> was predominant mostly in the upper layers of the soil where their nematode host and the plant host roots are abundant, a factor which may be a critical consideration when using <italic>P. penetrans</italic> as a nematode biological control agent.</p>
</abstract>

Pasteuria penetrans is considered as the primary agent responsible for soil suppressiveness to root-knot nematodes widely distributed in many agricultural fields. A preliminary survey on a Pittosporum tobira field where the grower had experienced a continuous decline in productivity caused by Meloidogyne incognita showed that the nematode was infected with Pasteuria penetrans. For effective control of the nematode, the bacterium and the host must coexist in the same root zone. The vertical distribution of Pasteuria penetrans and its relationship with the nematode host in the soil was investigated to identify (i) the vertical distribution of
P. penetrans endospores in an irrigated P. tobira field and (ii) the relationship among P. penetrans endospore density, M. incognita J2 population density, and host plant root distribution over time. Soil bioassays revealed that endospore density was greater in the upper 18 cm of the top soil compared with the underlying depths. A correlation analysis showed that the endospore density was positively related to the J2 population density and host plant root distribution. Thus, the vertical distribution of P. penetrans was largely dependent on its nematode host which in turn was determined by the distribution of the host plant roots. The Pasteuria was predominant mostly in the upper layers of the soil where their nematode host and the plant host roots are abundant, a factor which may be a critical consideration when using P. penetrans as a nematode biological control agent.

Vertical Distribution of <italic>Pasteuria penetrans</italic> Parasitizing <italic>Meloidogyne incognita</italic> on <italic>Pittosporum tobira</italic> in Florida

Journal of Nematology

This work is licensed under the Creative Commons Attribution 4.0 International License.

Vertical Distribution of  Parasitizing  on  in Florida

Pasteuria penetrans is considered as the primary agent responsible for soil suppressiveness to root-knot nematodes widely distributed in many agricultural...

Vertical Distribution of Pasteuria penetrans Parasitizing Meloidogyne incognita on Pittosporum tobira in Florida

Online veröffentlicht: 05. Dez. 2017

Seitenbereich: 168 - 176

Eingereicht: 17. Sept. 2017

DOI: https://doi.org/10.21307/jofnem-2017-077

Schlüsselwörter
bioassay, endospore, soil profile, vertical distribution.

© 2017 Richard Baidoo et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Vertical Distribution of Pasteuria penetrans Parasitizing Meloidogyne incognita on Pittosporum tobira in Florida

Online veröffentlicht: 05. Dez. 2017

Seitenbereich: 168 - 176

Eingereicht: 17. Sept. 2017

DOI: https://doi.org/10.21307/jofnem-2017-077

Schlüsselwörterbioassay, endospore, soil profile, vertical distribution.

© 2017 Richard Baidoo et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Schlüsselwörter
bioassay, endospore, soil profile, vertical distribution.