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Correlated Response in Plant Height and Heading Date to Selection in Perennial Ryegrass Populations

^a INRA-SAD, UMR Agir, BP 52627, F-31326 Castanet-Tolosan Cedex, France
^b INRA-UGAPF, F-86600 Lusignan, France
^c Biostatistique, UFR Médecine, 640 avenue du Doyen Giraud, F-34295 Montpellier Cedex 5, France

View larger version (24K): [in a new window]   Fig. 1. Negative correlation between heading date and plant height in HS families (original, short-, and long-leaved populations) and cultivars of perennial ryegrass at the vegetative stage (r = –0.59 and –0.42, respectively). Bars indicate 95% confidence interval.

View larger version (26K): [in a new window]   Fig. 2. Time course of stem length in cumulative degree days since 1 January. All regressions were significant at P < 0.05.

View larger version (15K): [in a new window]   Fig. 3. Time course of the phenological stages of the apex in the "short-" and "long-leaved" families: white stria (WS), double ridges (DR), appearance of glumes (B), appearance of stamens (C), and heading date expressed in cumulative degree days from 1 January.

View larger version (19K): [in a new window]   Fig. 4. Relationship between adult leaf length and leaf elongation rate. Bars indicate 95% confidence interval.

View larger version (20K): [in a new window]   Fig. 5. Time course of number of tillers per plant expressed in growing degree days since the 1 January. Bars indicate 95% confidence interval.

View larger version (17K): [in a new window]   Fig. 6. Time course of plant dry matter expressed in growing degree days since 1 January. The overall difference in dry matter per plant was significant between "long-" and "short-leaved" families (P < 0.05). Bars indicate 95% confidence interval.