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Differences in Tillering of Long- and Short-Leaved Perennial Ryegrass Genetic Lines under Full Light and Shade Treatments

^a Institut National de Recherche Agronomique, Unité d'Ecophysiologie des Plantes Fourragères, F-86600 Lusignan, France, and Dairying Research Corp., Private Bag 3123, Hamilton, New Zealand
^b Institut National de Recherche Agronomique, Unité de Génétique et d'Amélioration des Plantes Fourragères, F-86600 Lusignan, France
^c Institut National de Recherche Agronomique, Unité d'Ecophysiologie des Plantes Fourragères, F-86600 Lusignan, France
^d Institut National de Recherche Agronomique, Unité de Génétique et d'Amélioration des Plantes Fourragères, F-86600 Lusignan, France
^e Institut National de Recherche Agronomique, Unité d'Ecophysiologie des Plantes Fourragères, F-86600 Lusignan, France
^f Institute of Natural Resources, Massey Univ., Private Bag 11-222, Palmerston North, New Zealand
^g Dairying Research Corp., Private Bag 3123, Hamilton, New Zealand

View larger version (20K): [in a new window]   Fig. 1 Relationship between leaf growth components, sward LAI, and tillering. Variables in bold type were measured in this experiment

View larger version (28K): [in a new window]   Fig. 4 Effect of light treatments on site filling (FS) of (a) early-flowering and (b) late-flowering ryegrass genetic lines. Slope coefficients of equations are values of FS. Shade effects were significant at P < 0.001 in all cases; E, Ellett; R, Grasslands Ruanui; LL, long-leaved selection; SL, short-leaved selection; C, control light environment; S, simulated shade environment

View larger version (38K): [in a new window]   Fig. 2 Leaf and tiller appearance on the main shoot for (a) early-flowering and (b) late-flowering genetic lines. Analysis of variance showed a significant difference for AL (P < 0.001) but not for AT (P > 0.01) in both light treatments between Ellett and Grasslands Ruanui, and between LL and SL; E, Ellett; R, Grasslands Ruanui; LL, long-leaved selection; SL, short-leaved selection; C, control light environment; S, simulated shade environment

View larger version (27K): [in a new window]   Fig. 3 Effects of light treatments on tiller number per plant for (a) early-flowering, and (b) late-flowering genetic lines. In all cases, differences between shade and control treatment were highly significant (P < 0.001). Measurements were made to 350 GDD; E, Ellett; R, Grasslands Ruanui; LL, long-leaved selection; SL, short-leaved selection; C, control light environment; S, simulated shade environment