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The growth of nematode ‘tolerant’ and ‘intolerant’ soyabeans as affected by phosphorus, Glomus intraradices and light
Author(s) -
PRICE N. S.,
RONCADORI R. W.,
HUSSEY R. S.
Publication year - 1995
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1995.tb01682.x
Subject(s) - biology , cultivar , soybean cyst nematode , heterodera , nematode , phosphorus , shoot , agronomy , horticulture , botany , chemistry , ecology , organic chemistry
The effects of the vesicular‐arbuscular mycorrhizal (VAM) fungus, Glomus intraradices , and the soyabean cyst nematode (SCN), Heterodera glycines , were studied singly and in combination on two soyabean cultivars, cv. Bragg (nematode intolerant) and cv. Wright (moderately nematode tolerant) grown in the greenhouse in soils with low (35 μg/g) and high (70 μg/g) phosphorus (P). Cultivar Wright grew better than cv. Bragg, showing a greater response to P and VAM, and was damaged less by SCN. These differences were not apparent, or were reversed, when the same cultivars were grown in growth chambers where lighting was sub‐optimal. Cultivar Wright had a larger shoot:root ratio than cv. Bragg. This finding and the observed growth responses indicate that cv. Wright has a more efficient root system than cv. Bragg. This, we suggest, is the basis of both the greater VAM response observed in. and the greater nematode tolerance ascribed to, cv. Wright compared to cv. Bragg.