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Cultivation of Heligmosomoides Polygyrus: An Immunomodulatory Nematode Parasite and its Secreted Products

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Post-Infection Development of Heterodera lespedezae.

D S Bhatti, H Hirschmann, J N Sasser

Journal of Nematology

|March 26, 2009

Summary

This study details the post-infection development and temperature effects on the Heterodera lespedezae nematode life cycle. Optimal development occurred at 26/26 C, with lower temperatures prolonging the life cycle.

Area of Science:

Plant Nematology
Developmental Biology
Agricultural Entomology

Background:

Heterodera lespedezae is a plant-parasitic nematode.
Understanding its life cycle and environmental influences is crucial for crop protection.

Purpose of the Study:

To investigate the morphological changes during post-infection development of H. lespedezae.
To determine the influence of various temperatures on the nematode's life cycle progression.

Main Methods:

Morphological observations of post-infection stages, including stylet, cuticle, esophageal glands, and reproductive system.
Life cycle assessment across a range of controlled day/night temperatures (18/14 to 30/26 C) in a phytotron.

Main Results:

Keywords:

lespedeza morphology phytotron temperature effect

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Morphological development parallels that of Heterodera schachtii, with distinct stylets and active feeding in all post-infection stages.

Developmental phases like matrix deposition and oviposition correlate with adult female color changes.

The optimal temperature for H. lespedezae development was 26/26 C.

Lower temperatures (18/14, 18/18, 22/18 C) significantly extended the time required to complete the life cycle compared to higher temperatures.

Conclusions:

H. lespedezae exhibits distinct morphological characteristics throughout its post-infection development.
Temperature is a critical factor influencing the H. lespedezae life cycle duration, with 26/26 C being optimal.
These findings contribute to a better understanding of H. lespedezae biology and inform management strategies.