New Zealand Journal of Agricultural Research abstracts
Variation in white clover for resistance to clover cyst nematode
J. van den Bosch
C. F. Mercer
J. L. Grant
AgResearch Grasslands
Private Bag 11008
Palmerston North, New Zealand
Abstract The clover cyst nematode (Heterodera
trifolii) infects white clover (Trifolium repens) in pasture
throughout New Zealand, reducing plant growth and nutrition. The preferred
control method for both economic and ecological reasons is to breed resistant
cultivars, with resistance measured as a reduction in cysts/g of root dry
weight. Many New Zealand and overseas white clover seed lines and cultivars
were screened for resistance. There were highly significant differences between
lines for number of cysts, root weight, and cysts/g of root dry weight.
Selected genotypes were re-screened using five stolon tips per genotype, and
the results were correlated with the first screening. There were high
correlations between the number of cysts/plant and cysts/g of root dry weight
for all screenings. Two Italian Ladino cultivars were generally among the most
resistant lines, as was a line bred for H. trifolii resistance in the
Netherlands. There were no immune plants, but the results and the calculated
broad sense heritabilities indicate that breeding for resistance is possible.
Keywords Trifolium repens; white clover; Heterodera
trifolii; clover cyst nematode; resistance; plant breeding; selection;
variation; pasture
New Zealand Journal of Agricultural Research, 1997, Vol. 40: 223-229
0028-8233/97/4002-0223 $7.00/0 (c) The Royal Society of New Zealand
1997
PDF file of entire paper: medium quality (521K); (scanned from paper original: notes about this process)
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