Flooding effects on starch partitioning during early growth of two oak species |
| |
Authors: | Bastien Gérard Badr Alaoui-Sossé Pierre-Marie Badot |
| |
Institution: | (1) Laboratoire de Chronoenvironnement UMR UFC/CNRS 6249, Université de Franche-Comté, 4 Place Tharradin, BP 71 427, 25 211 Montbéliard Cedex, France |
| |
Abstract: | Pedunculate (Quercus robur L.) and sessile (Q. petraea Matt.] Liebl.) oaks are the most common oak species in Western Europe. They are known to display different ecological requirements,
particularly relative to root hypoxia induced by flooding: In a glasshouse study of seedlings, we quantified the effects of
flooding on starch mobilization from cotyledons and starch partitioning. Growth and distribution of lateral roots were also
measured. The above-ground growth of Q. robur was less affected by flooding than that of Q. petraea which failed to develop a second flush. Root growth was also severely inhibited, particularly in Q. petraea. In Q. robur, lateral root initiation as well as elongation was restricted to the soil surface layer. Flooding markedly reduced total
growth and concentrations of in all components except stems. Starch mobilization from cotyledons was delayed by flooding,
especially in Q. robur seedlings. Under flooding, the decrease of cotyledons dry mass and starch content in Q. robur was lower than in Q. petraea, whereas Q. robur displayed larger growth than Q. petraea. The features of carbohydrate management may be crucial in the observed differences in flooding tolerance of these species. |
| |
Keywords: | Cotyledons Hypoxia Lateral root distribution Quercus petraea Quercus robur Starch |
本文献已被 SpringerLink 等数据库收录! |
|