Distribution, frequency and occurrence of cereal nematodes on the Central Anatolian Plateau in Turkey and their relationship with soil physicochemical properties


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Yavuzaslanoglu E., Elekcioglu H. I. , Nicol J. M. , Yorgancilar O., Hodson D., Yildirim A. F. , et al.

NEMATOLOGY, cilt.14, ss.839-854, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 14
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1163/156854112x631926
  • Dergi Adı: NEMATOLOGY
  • Sayfa Sayısı: ss.839-854

Özet

The distribution of important plant-parasitic and free-living nematodes in the cereal production areas of the Central Anatolian Plateau (CAP) of Turkey was investigated with systematic surveys. Two important plant-parasitic nematode groups were found widely distributed; cereal-cyst nematodes (78.3%) and root-lesion nematodes (42.6%). Cereal cyst nematodes (CCN) were identified as Heterodera filipjevi in 18 provinces. Heterodera latipons was found in only one province. Pratylenchus thornei and P. neglectus were the most widely distributed species of root-lesion nematodes. Other frequently recorded plant-parasitic nematodes belonged to the genera Geocenamus (52.4%), Pratylenchoides (35.6%), Helicotylenchus (29.7%) and Paratylenchus (19.2%). Konya on the southern CAP had a significantly high incidence of P. neglectus as well as free-living nematodes. The incidence of CCN was greatest in areas of sandy soils on the CAP, with densities of up to 95 cysts (100 g soil)(-1). Population densities of Geocenamus, Pratylenchus and Pratylenchoides were high in some locations. Soil physicochemical properties were investigated for their relationship to nematode distribution. There was a slight positive correlation of P. thornei and clay content; conversely, there was a significant negative correlation of P. neglectus with clay and a positive correlation with sand. Electrical conductivity (EC) was positively correlated with P. neglectus. Nematodes in the genera Helicotylenchus, Paratylenchus, Trophurus and Tylenchorhynchus were only recorded at low population densities in the sampled area. By contrast, nematodes in the genera Aphelenchus, Aphelenchoides, Ditylenchus, Dorylaimus, Tylenchus and bacterivorous genera had relatively high populations. Total free-living nematodes were positively correlated with EC and zinc (Zn) concentration. The Zn content of soil was generally at a level deficient for plant growth.

The distribution of important plant-parasitic and free-living nematodes in the cereal production areas of the Central

Anatolian Plateau (CAP) of Turkey was investigated with systematic surveys. Two important plant-parasitic nematode groups were

found widely distributed; cereal-cyst nematodes (78.3%) and root-lesion nematodes (42.6%). Cereal cyst nematodes (CCN) were

identified as

 

Heterodera filipjevi in 18 provinces. Heterodera latipons was found in only one province. Pratylenchus thornei and P.

neglectus

 

 

were the most widely distributed species of root-lesion nematodes. Other frequently recorded plant-parasitic nematodes

belonged to the genera

 

Geocenamus (52.4%), Pratylenchoides (35.6%), Helicotylenchus (29.7%) and Paratylenchus (19.2%). Konya

on the southern CAP had a significantly high incidence of

 

P. neglectus as well as free-living nematodes. The incidence of CCN was

greatest in areas of sandy soils on the CAP, with densities of up to 95 cysts (100 g soil)

 

1. Population densities of Geocenamus,

Pratylenchus

 

 

and Pratylenchoides were high in some locations. Soil physicochemical properties were investigated for their relationship

to nematode distribution. There was a slight positive correlation of

 

P. thornei and clay content; conversely, there was a significant

negative correlation of

 

P. neglectus with clay and a positive correlation with sand. Electrical conductivity (EC) was positively correlated

with

 

P. neglectus. Nematodes in the genera Helicotylenchus, Paratylenchus, Trophurus and Tylenchorhynchus were only recorded at low

population densities in the sampled area. By contrast, nematodes in the genera

 

Aphelenchus, Aphelenchoides, Ditylenchus, Dorylaimus,

Tylenchus

 

 

and bacterivorous genera had relatively high populations. Total free-living nematodes were positively correlated with EC and

zinc (Zn) concentration. The Zn content of soil was generally at a level deficient for plant growth.

Keywords –

 

 

barley, electrical conductivity, Heterodera filipjevi, Heterodera latipons, iron, nematode survey, organic matter, pH,

Pratylenchus

 

 

spp., texture, wheat, zinc.