Ability to recover overrides the negative effects of flooding on growth of tropical grasses Chloris gayana and Panicum coloratum
José A. Imaz A B , Daniel O. Giménez A , Agustín A. Grimoldi C D and Gustavo G. Striker C E F G
+ Author Affiliations
- Author Affiliations
A INFIVE-CONICET, Facultad de Agronomía, Universidad Nacional de La Plata, cc 327 (1900), Diagonal 113 y Calle 61, No. 495, La Plata, Argentina.
B IIACS, Instituto de Investigación Animal del Chaco Semiárido, INTA, Chañar Pozo s/n (4113), Leales, Tucumán, Argentina.
C IFEVA-CONICET, Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, CPA 1417 DSE, Buenos Aires, Argentina.
D Cátedra de Forrajicultura, Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, CPA 1417 DSE, Buenos Aires, Argentina.
E Cátedra de Fisiología Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, CPA 1417 DSE, Buenos Aires, Argentina.
F School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia.
G Corresponding author. Email: striker@ifeva.edu.ar
Crop and Pasture Science 66(1) 100-106 https://doi.org/10.1071/CP14172
Submitted: 25 June 2014 Accepted: 6 August 2014 Published: 9 January 2015
Abstract
This study assessed the flooding tolerance of the tropical grasses Chloris gayana Kunth and Panicum coloratum L. at different times of the year: (i) late winter flooding for 50 days (WF), (ii) early spring flooding (SF) for 20 days, and (iii) long-term flooding covering both periods (WF + SF, 70 days). A growth period under well-watered conditions was allowed after each flooding event to assess recovery of plant species. Plants were harvested after each flooding event and at the end of the recovery period. Panicum coloratum had higher tolerance to WF than C. gayana. Treatment WF did not affect biomass in P. coloratum, whereas it reduced biomass of flooded plants by 38% in C. gayana. Treatment SF did not differentiate the species for tolerance; both registered moderate reduction in their growth (20–30%). Under WF + SF, C. gayana showed additional reduction in its growth over that observed when subjected separately to either WF or SF, whereas P. coloratum did not. Both species displayed remarkably fast recovery from flooding when temperatures rose during early summer, attaining biomass equivalent to that of non-flooded plants 1 month after water subsided. Therefore, although P. coloratum appears slightly more tolerant during flooding than C. gayana, both species are promising for introduction in temperate lowland grasslands.
Additional keywords: seasonal flooding, Rhodes grass, Klein grass, plant recovery.
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