INVESTIGADORES
MARINANGELI Pablo Alejandro
artículos
Título:
Water-Use Efficiency and Growth Capacity of Two Amaryllidaceae Species under Three Different Water Regimes
Autor/es:
VIDAL, P; MARINANGELI PABLO; MEDRANO, H; GULIAS, J
Revista:
ACTA HORTICULTURAE
Editorial:
International Society for Horticultural Sciences
Referencias:
Lugar: Leuven; Año: 2012
ISSN:
0567-7572
Resumen:
Habranthus tubispathus and Rhodophiala bifida are
two Amaryllidaceae species native to Argentina showing a potential interest for
using as garden plants. Both species show a different distribution, since H.
tubispathus is usually found in more xeric habitats than R. bifida. The
objective of the present work was to study the growth capacity and the water
use efficiency at leaf and plant level of R. bifida and H.
tubispathus under different water regimes. Bulbs of both species were grown
in pots under greenhouse conditions during spring and subjected to three
different water regimes: field capacity, 60% of field capacity and 40% of field
capacity. During the first ten days, all plants were grown under well watered
conditions. Thereafter, water stress treatments were applied for a period of
six weeks. Variations in plant water use efficiency (WUEp), biomass
production and gas exchange parameters, including water use efficiency at leaf
level (both A/g, intrinsic water use efficiency, and A/E, instantaneous water
use efficiency), were analyzed. Both species showed similar biomass production
regardless the water regime. By contrast, Rhodophiala presented a higher
WUEp than Habranthus and both species showed a higher WUEp
under water stress (up to4 g
dry matter l-1 in Rhodophiala
and up to 2.7 g
dry matter l-1 in Habranthus) than under field capacity (1.6 g dry matter l-1 in Rhodophiala
and 1.0 g
dry matter l-1 in Habranthus).
Similar results were observed when WUE at leaf level was analyzed. The correlation
between WUEp and A/g was positive and significant when both species
were considered. By contrast, this correlation was not significant for each
single species, suggesting the difficulties to estimate WUEp from
gas exchange measurements.