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Effect of Globodera rostochiensis on the growth of reciprocal grafts between two potato cultivars of different tolerance in a field trial
Author(s) -
TRUDGILL D. L.
Publication year - 1987
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1987.tb03236.x
Subject(s) - biology , sowing , horticulture , rootstock , cultivar , globodera rostochiensis , infestation , agronomy , population , botany , ecology , nematode , demography , sociology
SUMMARY The tolerance of plants produced from reciprocal grafts between cv. Cara and cv. Pentland Dell were compared in field plots containing different initial population densities of Globodera rostochiensis. Both stock and scion contributed to the greater tolerance of cv. Cara as compared with cv. Pentland Dell. Ground cover measurements, made by a novel photographic method, showed that a heavy infestation of G. rostochiensis decreased the top growth of all plants: more for those with scions of Pentland Dell than those with scions of Cara. The stock did not initially affect the extent to which top growth was reduced in the heavily infested plots but later measurements showed a progressively increased effect on top growth for plants with stocks of Pentland Dell and a decreased effect for those with Cara. In a destructive harvest 13 wk after planting the relatively small effect of G. rostochiensis on the top growth of plants with Cara scions was not reflected in the tuber yields which were markedly decreased. However, plants with Cara stocks were considerably more tolerant (i.e. tuber yields were affected less) than those with stocks of Pentland Dell. Overall, plants of Pentland Dell scions on Cara root stocks were most tolerant at this stage. Between 13 and 16 wk, when a second destructive harvest was made, plants with Pentland Dell scions were senescent and their yield increased little. In contrast, plants with Cara scions were still growing and their yield increased markedly so that by 16 wk the most tolerant combination was Cara on Cara.