Tillering Responses to the Light Environment and to Defoliation in Populations of Perennial Ryegrass (Lolium perenneL.) Selected for Contrasting Leaf Length
| Autor: | Laurent Hazard, Hélène Gautier, Claude Varlet-Grancher |
|---|---|
| Přispěvatelé: | Unité de recherche d'Écophysiologie des Plantes Fourragères (UEPF), Institut National de la Recherche Agronomique (INRA), Unité de recherche Génétique et Amélioration des Plantes Fourragères (UGAPF), ProdInra, Migration |
| Rok vydání: | 1999 |
| Předmět: |
education.field_of_study
RAY GRASS ANGLAIS biology Perennial plant Population food and beverages Far-red phyllochrone Plant Science [SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics biology.organism_classification Lolium perenne [SDV.BV.BOT] Life Sciences [q-bio]/Vegetal Biology/Botanics Lolium Agronomy Phyllochron Leaf size Shading education ComputingMilieux_MISCELLANEOUS |
| Zdroj: | HAL Annals of Botany Annals of Botany, Oxford University Press (OUP), 1999, 83 (4), pp.423-429 |
| ISSN: | 0305-7364 1095-8290 |
| Popis: | Tillering responses to the light environment and to defoliation were studied in two populations of perennial ryegrass (Lolium perenne L.) selected for contrasting leaf lengths. The objective of this study was to determine whether dierences in tillering responses between populations, as a result of management practices, aected their competitive ability. Young seedlings were exposed, under controlled conditions, to defoliation, neutral shading (decreased photosynthetic photon flux), low red:far-red ratio and}or decreased blue light. Selection for longer leaves reduced the tillering rate. After defoliation, this dierence between short- and long-leaved populations was magnified. Defoliation decreased both site filling and phyllochron of the long-leaved population but had no eect on the shortleaved population. Lowering the photosynthetic photon flux reduced the phyllochron in both population. Decreasing the red:far-red ratio reduced tillering rate by reducing site filling, whereas decreasing blue light had no significant eects on tillering. Tillering responses to photosynthetic photon flux and to red:far-red ratio were similar in the two populations selected for contrasting leaf length. The implication of these tillering responses in defining the competitive ability of the grass plants is discussed in relation to their management. # 1999 Annals of Botany Company |
| Databáze: | OpenAIRE |
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