Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/121309
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Type: Journal article
Title: Intraspecific competition in oat varieties selected for grain yield and milling
Author: Sadras, V.O.
Mahadevan, M.
Zwer, P.K.
Citation: Crop and Pasture Science, 2018; 69(7):673-680
Publisher: CSIRO Publishing
Issue Date: 2018
ISSN: 1836-0947
1836-5795
Statement of
Responsibility: 
Victor O. Sadras, M. Mahadevan, and Pamela K. Zwer
Abstract: Intraspecific competition in oat varieties selected for grain yield and milling Oats likely emerged as part of the weedy grass assemblage in early wheat and barley crops. Some Avena species, such as A. fatua and A. sterilis, evolved into aggressive weeds, and the high interspecific competitive ability of cultivated oats (A. sativa) is valued agronomically to facilitate weed control in rotations. We tested the hypothesis, verified in many crops, that high yield of oats is related to low intraspecific competitive ability. Ten contemporary oat varieties, selected for grain yield and milling attributes, where grown in three environments. Response to competition was calculated as 100 × (Yb – Yc)/Yc, where Y is yield measured in border (b) and centre (c) rows. The same definition was used to calculate response to competition of yield components (biomass, harvest index, grain number, grain weight) and the components of grain number (panicle number and grains per panicle). Yield response to competition was affected by all three sources of variation, i.e. environment, variety and variety × environment interaction. The interaction demonstrates the plasticity of yield response to intraspecific competition; for example, the response to competition of variety Mortlock varied from 9% to 71% among environments. This plasticity in yield response to competition was partially related to variety-dependent responses to competition for biomass and harvest index, number of panicles and number of grains per panicle. We did not find the expected negative association between yield and variety-dependent response to competition. We discuss how this lack of correlation could relate to sampling issues, i.e. a limitation in the range of environments and varieties explored in this study, or reflect a legitimate feature of oat crops arising from early and contemporary selective pressures.
Keywords: Interference; plasticity; phenotype; selection; yield
Rights: Journal compilation © CSIRO 2018
DOI: 10.1071/CP18098
Appears in Collections:Agriculture, Food and Wine publications
Aurora harvest 4

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