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Performance of Isogenic Soybean Lines in Monoculture and Relay Intercropping Environments 1
Author(s) -
McBroom R. L.,
Hadley H. H.,
Brown C. M.
Publication year - 1981
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1981.0011183x002100050009x
Subject(s) - monoculture , intercropping , biology , agronomy , yield (engineering) , grain yield , allele , gene , genetics , materials science , metallurgy
Sets of near‐isogenic lines of soybeans [ Glycine max (L.) Merr.], differing in single characteristics, have been tested in monoculture environments but not in relay intercropping environments. These environments seemed different enough to warrant testing several near isogenic lines differing by the genes dt 1 , Dt 2 , Lf 1 , ln , or e 3 to determine if any of these genes confer a yield advantage in relay intercropping. Near isogenic lines in ‘Harosoy’ and ‘Clark’ genetic backgrokunds were grown in monoculture and in relay intercropping systems at Urbana, Ill. in 1978 and 1979 and at DeKalb, Ill. in 1979. In relay intercropping plots, soybeans were planted between rows of small grains 1 to 2 months before small grain harvest. The soybeans germinated and established stands, then the small grains were harvested as they matured. There was no consistent yield advantage for any of the plant traits when isogenic lines were grown either in relay intercropping or in monoculture systems. The dt 1 allele reduced yield in both cropping systems. The ln and Lf 1 alleles reduced yields in some environments. The Dt 2 and e 3 alleles had consistently neutral effects on yield in both cropping systems.