TABLE CONTENTS

SILETTA NOVA reduce stubby root nematodes (Trichodorus ssp), which are the transmitter
of the Tobacco Rattle Virus in order to reduce the corky ring spot syndrome in potatoes.
Additional benefits: Growing trap crops changes soil quality into into soil with higher water
infiltration and better respiration. It prevents wind erosion and protects water and nutrients.
Fodder radish and mustard are characterized by a very good early vigour, which helps to
suppress weeds and voluntary crops.
Biofumigation: In addition to these present benefits of growing catch crops which are more or
less related to rooting system and resistance, P. H. Petersen has selected plants with an
additional benefit by using the green parts of the plants for biofumigation.
Absence of Resistance Association between Cereal Cyst (Heterodera
filipjevi) and Root Lesion (Pratylenchus thornei) Nematode in Spring Wheat
Sister Lines
Toktay, H. (1), E. Sahin (2), J.M. Nicol (2), R. Trethowan (3) & H.I. Elekcioglu (4)
(1) Plant Protection Research Institute, 01321, Adana/Turkey; (2) CIMMYT (International Maize and Wheat
Improvement Centre), ICARDA-CIMMYT Wheat Improvement Program, Ankara, Turkey; (3) University of
Sydney, Cobbity, NSW, Australia; (4) Cukurova University, Faculty of Agriculture, Plant Protection Dpt.,
Adana, Turkey.
Both the sedentary Cereal Cyst Nematode (CCN) and migratory Root Lesion Nematode
(RLN) are known to be economically important nematodes of wheat production systems in
several parts of the world. In Turkey they commonly occur together in cereal production
systems and the main method of control is through the identification and production of
resistant germplasm. An advanced spring bread wheat (F9) breeding population was
developed in CIMMYT Mexico using Middle-Eastern landrace (AUS4930 7.2) which has
been identified as resistant to both CCN (H. avenae Australian pathotype Ha13 and H.
filipjevi HF1 in Turkey) and in addition has partial resistance to RLN - P. thornei. This
source was crossed with the widely adapted CIMMYT line Pastor. In Turkey 40 of these
advanced F9 sister lines were screened for their reaction to the Turkish population of P.
thornei and H. filipjevi. The results clearly demonstrated that 75% of the population (30 lines)
have partial resistance to P. thornei, however only 3 of these also had effective resistance to
H. filipjevi. As the resistance to CCN is well documented to be controlled by a single gene
and the AUS4930 7.2 source is suggested to be allelic or closely related to the well published
Cre1 on chromosome 2BL. Recent mapping work (Toktay et al.) has confirmed as with
other sources of P. thornei resistance to be quantitative and the AUS4930 7.2 is associated
with the regions 1B, 2B and 6D. Although they may share one chromosomal region in
common from this work there is no suggestion to consider this relates to the genetic control
of both nematodes. The inference of this work is that lines with multiple nematode
resistance are required to be screened against both nematodes, which will enable the
identification of effective sources of dual resistance to identified and deployed in wheat
breeding programs.
5 th International Congress of Nematology, 2008 242