Relationship Between Inflorescence Size and Seed Production in Barnyardgrass (Echinochloa crus-galli)

Barnyardgrass inflorescence length ranged from less than 2 to over 20 cm. Inflorescences less than 4 cm long were a single first-order raceme, while the largest had 20 to 50 primary branch racemes. Inflorescences longer than about 12 cm and with more than about 12 racemes showed second-order branchi...

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Bibliographic Details
Published in:Weed science 1992-01, Vol.40 (1), p.74-78
Main Author: Norris, Robert F.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
BIOLOGIA
Biological and medical sciences
BIOLOGIE
BIOMASA
Biomass
BIOMASSE
CARACTERES DE RENDIMIENTO
COMPETENCIA BIOLOGICA
COMPETITION BIOLOGIQUE
COMPOSANTE DE RENDEMENT
Crops
DIMENSION
Echinochloa crus-galli
ECHINOCHLOA FRUMENTACEA
ECOLOGIA
ECOLOGIE
Florets
Fundamental and applied biological sciences. Psychology
Generalities, botany, ecology, damages, economic importance
GRAINE
Grains
INDICE DE CRECIMIENTO
INFLORESCENCE
Inflorescences
INFLORESCENCIAS
MACOLLAMIENTO
MALEZAS
MAUVAISE HERBE
Parasitic plants. Weeds
PERFORMANCE DE REPRODUCTION
Phytopathology. Animal pests. Plant and forest protection
Plants
PRODUCCION
PRODUCTION
RAMIFICACION
RAMIFICATION
Regression coefficients
REPRODUCTIVIDAD
Seed production
SEMILLA
TALLAGE
TAUX DE CROISSANCE
Tillering
Tillers
Weed Biology and Ecology
Weeds
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Summary:Barnyardgrass inflorescence length ranged from less than 2 to over 20 cm. Inflorescences less than 4 cm long were a single first-order raceme, while the largest had 20 to 50 primary branch racemes. Inflorescences longer than about 12 cm and with more than about 12 racemes showed second-order branching. Air-dried structural biomass increased from less than 2 milligrams for the smallest to over 300 milligrams for the largest inflorescences. Inflorescence length and structural biomass were positively correlated (r2 = 0.95). Floret numbers increased from about 15 for smallest inflorescences to over 2000 for largest inflorescences and were positively correlated with inflorescence length (r2 = 0.94) and with inflorescence structural biomass (r2 = 0.94). Biomass of caryopses plus aborted florets had the same relationships as those for floret number. Measurement of frequency distribution of size and determination of numbers of inflorescences per plant should provide a means to predict fecundity in barnyardgrass.
ISSN:0043-1745
1550-2759
DOI:10.1017/S0043174500056988