Growth during recovery evidences the waterlogging tolerance of forage grasses
R. A. Ploschuk A B F , A. A. Grimoldi A C , E. L. Ploschuk D and G. G. Striker A B E
+ Author Affiliations
- Author Affiliations
A IFEVA, Universidad de Buenos Aires, CONICET, Facultad de Agronomía, Avenida San Martín 4453, CPA 1417, DSE Buenos Aires, Argentina.
B Universidad de Buenos Aires, Facultad de Agronomía, Cátedra de Fisiología Vegetal, Argentina.
C Universidad de Buenos Aires, Cátedra de Forrajicultura, Buenos Aires, Argentina.
D Universidad de Buenos Aires, Cátedra de Cultivos Industriales. Av. San Martín 4453 (CPA 1417 DSE) Buenos Aires, Argentina.
E School of Agriculture and Environment, Faculty of Science, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
F Corresponding author. Email: rploschuk@agro.uba.ar
Crop and Pasture Science 68(6) 574-582 https://doi.org/10.1071/CP17137
Submitted: 31 March 2017 Accepted: 5 June 2017 Published: 4 July 2017
Abstract
Waterlogging is a stress of increasing importance for pastures as a consequence of global climate change. We evaluated the impact of waterlogging on four forage grasses with alleged differential tolerance, emphasising not only responses during the stress but also their reported ability to recover from it. To do this, 42-day plants of Dactylis glomerata, Bromus catharticus, Festuca arundinacea and Phalaris aquatica were subjected to 15-day waterlogging, followed by a subsequent 15-day recovery period. Shoot and root growth (i.e. RGR) during both periods, in addition to net photosynthesis and stomatal conductance rates during waterlogging were assessed. Sensitivity exhibited by D. glomerata and B. catharticus during waterlogging was related to growth arrest of roots – but not of shoots – along with a progressive fall in stomatal conductance and net photosynthesis. The injury during waterlogging preceded a negligible growth of shoots and roots, only evident during recovery in both species. By contrast, P. aquatica exhibited unaltered root RGR and promoted shoot RGR with no impact on leaf gas exchange during waterlogging; whereas F. arundinacea showed intermediate tolerance as root RGR was reduced during waterlogging, with stomatal conductance, net photosynthesis and shoot RGR remaining unaffected. These latter two species fully regained shoot and root RGR during recovery. So, P. aquatica and F. arundinacea seem more suitable for prone-to-flood lowlands, whereas to be conclusive about waterlogging tolerance, it is necessary to examine plant recovery as shown in D. glomerata and B. catharticus.
Additional keywords: flooding, hypoxia, pasture grasses, tillering.
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