Different patterns of aerenchyma formation in two hygrophytic species of Paspalum (Poaceae) as response to flooding |
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| Affiliation: | 1. Cátedra de Botánica Agrícola, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires;2. Cátedra de Métodos Cuantitativos Aplicados, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires;3. Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;1. Plant Biology and Nature Management, Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium;2. Wetland and Marine Section, Centre for Biodiversity Department, National Museums of Kenya, P.O. Box 40658-00100, Nairobi, Kenya;3. Department of Biological Sciences, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa;4. Lake Naivasha Riparian Association, P.O. Box 358, Naivasha 20117, Kenya;5. Ecology Consultant, 5825 Bent Twig Rd., McLean, VA 22101, USA;1. College of Agriculture, Shanxi Agricultural University, Taigu 030800, P.R. China;2. Millet Research Institute, Shanxi Academy of Agricultural Sciences, Changzhi 046011, P.R. China;3. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R. China;1. Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China;2. Key Laboratory for Bio-Resources and Eco-Environment, College of Life Science, Sichuan University, Chengdu, Sichuan 610065, China;3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Paspalum modestum and P. wrightii are perennial grasses growing in permanent and seasonally flooded areas, respectively. The former produces short rhizomes and floating culms, the latter forms long rhizomes and erect culms. Variations in percentage aerenchymatous space (PAS) in different organs as a response to flooding was analysed using a clone of each species. Eighteen plantlets of each clone were cultivated during 7 months under flooded vs. unflooded conditions. After this period, roots, rhizomes, culms, and leaf sheaths were collected and prepared. PAS was measured using an image analysis device, and data were analysed using ANOVA.Production of aerenchyma took place in both species within the cortical parenchyma of roots, rhizomes and culms, and the mesophyll of leaf sheaths, both in flooded and unflooded plants. Under flooding conditions PAS increased in both species, although the individual response of organs differed: whereas in P. modestum PAS increased primarily in substratum-fixed roots, in P. wrightii all organs produced additional aerenchyma uniformly. Contrasting responses are understood as adaptations to permanent and seasonal flooding, respectively. |
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