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Development and recovery of iron deficiency by iron resupply to roots or leaves of strawberry plants
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Orientador(es)
Resumo(s)
Bare-root transplants of strawberry (Fragaria ananassa Duch. cv. ‘Selva’) were transferred to nutrient
solutions with or without iron (Fe). After six weeks of growth, plants grown in solution lacking Fe were
chlorotic and showed morphological changes in roots typical of Fe deficiency. Subsequently, four
treatments were applied for nine days: plants grown in continued absence of Fe (Fe0); plants grown in
continued presence of 10 mM Fe (Fe10); foliar application of ferrous sulphate every two days to chlorotic
plants (Fe-leaves); and growth of chlorotic plants in solution with ferrous sulphate (Fe-solution). After six
days, the chlorophyll (Chl) content in leaves of Fe-solution plants was similar to that in Fe10 plants.
Under the Fe-leaves treatment, a slight regreening of new leaves was observed only by the end of the
experiment. After nine days, ferric chelate reductase (FC-R) activity was unchanged in Fe10 but increased
in Fe0 plants. The FC-R activity of Fe-solution plants was similar to the initial value for chlorotic plants,
whereas it was reduced drastically under the Fe-leaves treatment. The Fe concentration in leaves of Fe0
and Fe10 was similar, whereas the Fe-solution and Fe-leaves treatments enhanced leaf Fe concentration.
In contrast to the Fe-solution treatment, foliar application of Fe did not increase the Fe concentration in
roots. Under our experimental conditions, FC-R activity in strawberry appeared to be deactivated rapidly
by pulses of Fe applied by foliar sprays. Deactivation was slower if Fe was applied directly to roots, which
suggested that the plants had greater opportunity to take Fe.
Descrição
Palavras-chave
Chlorophyll Ferric chelate reductase Iron chlorosis Iron fertilization Nutrients
Contexto Educativo
Citação
Pestana, M.; Correia, Pedro José; Saavedra, Teresa; Gama, Florinda; Abadía, Anunciación; Varennes, Amarilis de. Plant Physiology and Biochemistry, 53, 1, 1-5, 2012.