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Dynamics of Competition between Wheat and Oat

II. Effects of Dwarfing Genes

^a Joint Cent. for Crop Improvement, Inst. of Land and Food Resour., The Univ. of Melbourne, Victoria 3010, Australia
^b CSIRO Plant Industry, P.O. Box 1600, Canberra, ACT 2601, Australia

View larger version (15K): [in a new window]   Fig. 1. Height of oat [Avena strigosa cv. Saia] (*) and three near-isogenic height lines of wheat cultivar Maringa in 1999. Symbols indicate the wheat height line: • = tall, = semidwarf, and = dwarf. Vertical bars indicate the standard error within a sample date.

View larger version (16K): [in a new window]   Fig. 2. Biomass over time for (a) wheat cultivar Maringa and (b) oat (Avena strigosa cv. Saia) in monoculture (solid lines and solid symbols) and replacement mixtures (dotted lines and open symbols) in 1999. Symbols indicate the wheat height line used: • = tall, = semidwarf, and = dwarf; oat monoculture is shown by *. Vertical bars indicate the standard error within a sample date.

View larger version (15K): [in a new window]   Fig. 3. Relative performance, as measured by the ratio of plant mass in mixture to plant mass in monoculture, for oat [Avena strigosa cv. Saia] (, , and ) and three height lines of wheat cultivar Maringa in 1999: tall (•), semidwarf (), and dwarf (). The horizontal line indicates the expected value for equal mass in mixture and monoculture. Asterisks indicate those observations for which mixture biomass significantly differs from monoculture (P < 0.05), i.e., relative performance is significantly different from 1.0.

View larger version (13K): [in a new window]   Fig. 4. Height of oat [Avena sativa cv. Vasse] (*) and three near-isogenic height lines of (a) wheat cultivar Maringa, (b) APD, and (c) KCD in 2000. Symbols indicate the wheat height line: • = tall, = semidwarf, and = dwarf. Vertical bars indicate the standard error within a sample date.

View larger version (25K): [in a new window]   Fig. 5. Relative performance, as measured by the ratio of plant mass in mixture to plant mass in monoculture, for oat (Avena sativa cv. Vasse) and three height lines of wheat cultivar Maringa (row i), APD (row ii), and KCD (row iii) in 2000: tall (column a), semidwarf (column b), and dwarf (column c). Solid symbols refer to wheat and open symbols to oat. The horizontal line indicates the expected value for equal mass in mixture and monoculture. Asterisks indicate those observations for which mixture biomass significantly differs from monoculture (P < 0.05), i.e., relative performance is significantly different from 1.0.

View larger version (17K): [in a new window]   Fig. 6. Relative performance, as measured by the ratio of plant mass in mixture to plant mass in monoculture, for oat (Avena sativa cv. Vasse) and three height lines of wheat cultivar Maringa sown late in 2000 under dryland conditions (row i) or supplemented by irrigation (row ii): tall (column a), semidwarf (column b), and dwarf (column c). Solid symbols refer to wheat and open symbols to oat. The horizontal line indicates the expected value for equal mass in mixture and monoculture. Asterisks indicate those observations for which mixture biomass significantly differs from monoculture (P < 0.05), i.e., relative performance is significantly different from 1.0.