Waterlogging tolerance of eight C4 and seven C3 perennial forage grasses was reviewed. The median waterlogging duration was similar between species’ type, ranging between 18 and 21 days. Inter- and intra-species variability was found in shoot and root biomass in response to waterlogging. Urochloa brizantha (C4), Brachiaria hybrid (C4) and Dactylis glomerata (C3) were the less tolerant species to waterlogging (shoot biomass median of 45 per cent, 53 per cent and 80 per cent of controls), while U. humidicola (C4), Paspalum dilatatum (C4), Festuca arundinacea (C3) and Lolium perenne (C3) were the most tolerant (shoot biomass median of 97 per cent, 101 per cent, 87 per cent and 94 per cent of controls). A similar ranking of responses was found among species for root biomass. The formation of aerenchyma/root porosity (a key trait for waterlogging tolerance) was evaluated mainly in U. humidicola and P. dilatatum (C4 waterlogging-tolerant species), which showed considerable constitutive porosity (13 per cent and 32 per cent) and final values of 30 per cent and 41 per cent under waterlogging. Net photosynthesis and stomatal conductance as typical leaf physiological responses matched species’ waterlogging tolerance, with the impact of hypoxia higher in C3 than in C4 species. Gaps in knowledge about waterlogging tolerance in forage grasses are: (i) additional studies on C3 perennial grasses for temperate pasture areas prone to waterlogging, (ii) identification of traits and responses aiding plant recovery after waterlogging (and also during the stress), (iii) reassessment of waterlogging tolerance considering plant developmental stage (e.g. adult vs young plants), and (iv) evaluation of sequential (i.e. waterlogging − drought) and combined (i.e. waterlogging + salinity) stresses, which often co-occur in pasture lands.
Di Bella, C. E.; Grimoldi, A. A. & Striker, G. G. (2022).A quantitative revision of the waterlogging tolerance of perennial forage grasses.Crop and Pasture Science,73, (10),p.1200-1212
10.1071/CP21707
Di Bella, Carla Estefanía, Grimoldi, Agustín Alberto, Striker, Gustavo Gabriel.2022. "A quantitative revision of the waterlogging tolerance of perennial forage grasses".Crop and Pasture Science 73, no.10:1200-1212.
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