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CROP ECOLOGY, PRODUCTION & MANAGEMENT

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

bahmanii{at}drc.co.nz

There is uncertainty among plant breeders as to which characteristics to select for to optimize grass growth dynamics. The objective was to study the relationship between leaf length and tillering in perennial ryegrass (Lolium perenne L.). Two long-leaved and two short-leaved genetic lines were grown in simulated shade and near-full sunlight (control) environments. The genetic lines were New Zealand cultivars Ellett (long-leaved) and Grasslands Ruanui (short-leaved), both early flowering. The other two were late-flowering divergent selections `LL' (long-leaved) and `SL' (short-leaved). Differences between genetic lines in leaf length were attributable mainly to higher leaf elongation rate (LER) in the two long-leaved genetic lines, and leaf elongation duration (LED) did not differ significantly between genetic lines. Grasslands Ruanui had a higher tiller number per plant than Ellett in both light environments, explained by higher site filling but similar leaf appearance rate (A_L). In contrast, LL had a higher tiller number per plant than SL, arising from a higher A_L in LL. This difference decreased during the experiment under the control treatment because SL tended to have a higher site filling ratio than LL. However, in the shade treatment, differences in tiller number between LL and SL were more mediated by A_L than site filling. Therefore, selection for high LER and long lamina length, even though associated with reduced site filling in all treatments, did not necessarily result in reduced tiller number per plant.

Abbreviations: A_L, leaf appearance rate on the main shoot • A_T, tiller appearance rate on the main shoot • GDD, growing degree-days • LAI, leaf area index • LED, leaf elongation duration • LER, leaf elongation rate • PAR, photosynthetically active radiation • F_S, site filling • F_Sm, site filling calculated from observations on the main shoot • SU_m, site usage on the main shoot • LL, long-leaved breeding line obtained by divergent selection out of a collection of French ecotypes • SL, short-leaved breeding line obtained by divergent selection out of a collection of French ecotypes

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