Summary
One of the most promising control options against the parasitic weed Striga hermonthica is the use of crop varieties that combine resistance with high levels of tolerance. The aim of this study was to clarify the relation between Striga infestation level, Striga infection level and relative yield loss of sorghum and to use this insight for exploring the options for a proper screening procedure for tolerance. In three pot experiments, conducted in Mali (2003) and The Netherlands (2003, 2004), four sorghum genotypes were exposed to a range of Striga infestation levels, ranging from 0.0625 to 16 seeds cm−3. Observations included regular Striga emergence counts and sorghum grain yield at maturity.
There were significant genotype, infestation and genotype × infestation effects on sorghum yield. The relation between infestation level and infection level was density dependent. Furthermore, the relation between Striga infection level and relative yield loss was non-linear, though for the most resistant genotype Framida only the linear part of the relation was obtained, as even at high infestation levels only moderate infection levels were achieved. The results suggest that for resistant genotypes, tolerance can best be quantified as a reduced relative yield loss per aboveground Striga plant, whereas for less resistant genotypes the maximum relative yield loss can best be used. Whether both expressions of tolerance are interrelated could not be resolved. Complications of screening for tolerance under field conditions are discussed.
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Abbreviations
- ASNPC:
-
area under the Striga number progress curve
- DWkernel :
-
dry weight of kernel yield (g)
- NSmax :
-
maximum aboveground Striga numbers
- RYL:
-
relative yield loss (%)
- Ys :
-
observed yield of an individual plant grown under Striga infestation (g)
- Yc :
-
average kernel yield of all control plants of a specific genotype (g)
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Rodenburg, J., Bastiaans, L. & Kropff, M.J. Characterization of host tolerance to Striga hermonthica . Euphytica 147, 353–365 (2006). https://doi.org/10.1007/s10681-005-9030-2
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DOI: https://doi.org/10.1007/s10681-005-9030-2