Journal ArticleDOI
Effects of Pea Aphids (Homoptera: Aphididae) on the Nitrogen Fixing Activity of Bacteria in the Root Nodules of Pea Plants
G. M. Sirur,C. A. Barlow +1 more
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TLDR
Aphid feeding decreased acetylene-reducing activity of the bacteria, whole plant dry weight, nodule weight and number, and nitrogen content of plant tissue, and were proportional to the number of aphids infesting the plants.Abstract:
Different numbers of pea aphids, Acyrthosiphon pisum (Harris), were kept on pea plants, Pisum sativum (L.), bearing root nodules containing the symbiotic bacteria Rhizobium leguminosarum (Frank). Aphid feeding decreased acetylene-reducing activity of the bacteria by as much as 86%, whole plant dry weight up to 74%, nodule weight and number by 77 and 78%, respectively, and nitrogen content of plant tissue by a maximum of 84%. These effects were significant in both young plants 11 days after germination and in more mature plants after pod formation and were proportional to the number of aphids infesting the plants.read more
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Journal ArticleDOI
Plant–rhizobia mutualism influences aphid abundance on soybean
TL;DR: The results demonstrate that plant–rhizobia interactions influence plant resistance to insect herbivores and that some rhizobia strains confer greater resistance to their mutualist partners than do others.
Journal ArticleDOI
Compensatory growth response of the legume, Medicago sativa, to defoliation and denodulation
M. A. Quinn,M. H. Hall +1 more
TL;DR: Results indicated that partial defoliation affected shoot, root, and nodule biomass of M. sativa, but that partial denodulation only affected shoot biomass.
Effect of intercropping winter peas of differing leaf type and time of flowering on annual weed infestation in deep and shallow ploughed soils and on pea pests
TL;DR: Die Leistungsfahigkeit des okologischen Erbsenanbaus hangt in hohem Mase von vorbeugenden Kontrollstrategien fur unterschiedlichem Unkrautunterdruckungsvermogen nicht signifikant beeinflusst.
Dissertation
Agronomic aspects of intercropping spring or winter peas and cereals as influenced by ploughing system
TL;DR: The present study confirms the positive qualities of pea-oat intercrops with regard to weed suppression and plant performance and mitigates the risk of a decrease in plant performance caused by heavy field traffic and provides an alternative to deep ploughing even in low weed competitive, organically farmed grain legumes.
Journal ArticleDOI
Action du puceron Acyrthosiphon pisum (Harris) (Horn., Aphididae) sur les facteurs de production du pois proteagineux de printemps, en phase de floraison
TL;DR: Effect on pea production of Acyrthosiphon pisum (Harris) (Horn., Aphididae) infestation during flowering period During flowering period is unknown.
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