Effect of eyespot caused by Oculimacula yallundae and O. acuformis, assessed visually and by competitive PCR, on stem strength associated with lodging resistance and yield of winter wheat

Ray, R.V., Crook, M.J., Jenkinson, P. and Edwards, S.G. (2006) Effect of eyespot caused by Oculimacula yallundae and O. acuformis, assessed visually and by competitive PCR, on stem strength associated with lodging resistance and yield of winter wheat. Journal of Experimental Botany, 57 (10). pp. 2249-2257.

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Abstract

Winter wheat, (cv. Consort) was inoculated with three isolates of either Oculimacula yallundae or O. acuformis to determine>the effect of eyespot caused by each species on yield and lodgingresistance of winter wheat. Plants were visually assessed for disease incidence and severity, and pathogen DNA was quantified at GS 33 and GS 60. At early milk development of the crop (GS72), 900 main shoots were also visually assessed for the disease and subjected to mechanical tests for stem strength. Pathogen DNA was extracted from each shoot and quantified using competitive polymerase chain reaction (PCR). Although slight and moderate eyespot lesions caused by either species had no effect on ear weight, severe lesions caused by <em>O. acuformis and O. yallundaereduced ear weight by 3% and 7%, respectively. Stem lodgingfailed to occur at the site; however, yield losses of 11% forO. acuformis and 6% for O. yallundae were observed. Visual assessmentfailed to reveal differences between species in their effect on plant characteristics, stem bending strength, or stem safety factor. PCR data, however, showed that the two species had similar effects determined by different DNA concentrations. Both species reduced lodging resistance (stem safety factor) compared with the control. In contrast to healthy plants, where reductions were related predominantly to the height and weight distribution of the plants, the observed reductions of stem lodging resistance in infected plants with Oculimacula spp. were associated primarilywith reductions in stem bending strength.

Item Type:	Article
Divisions:	Crop and Environment Sciences (to 31.07.20)
Depositing User:	Mr Darren Roberts
Date Deposited:	08 Aug 2018 14:28
Last Modified:	08 Aug 2018 14:28
URI:	https://hau.repository.guildhe.ac.uk/id/eprint/16395

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