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Advisor(s)
Abstract(s)
Rice (Oryza sativa L.) is the most important staple food in the world. It is rich in genetic diversity and can
grow in a wide range of environments. Iron (Fe) deficiency is a major abiotic stress in crop production
and in aerobic soils, where Fe forms insoluble complexes, and is not readily available for uptake. To cope
with Fe deficiency, plants developed mechanisms for Fe uptake, and although rice was described as a
Strategy II plant, recent evidence suggests that it is capable of utilizing mechanisms from both Strategies.
The main objective of this work was to compare two cultivars, Bico Branco (japonica) and Nipponbare
(tropical japonica), to understand if the regulation of Fe uptake mechanisms could be cultivar (cv.)
dependent. Plants of both cultivars were grown under Fe-deficient and -sufficient conditions and
physiological and molecular responses to Fe deficiency were evaluated. Bico Branco cv. developed more
leaf chlorosis and was more susceptible to Fe deficiency, retaining more nutrients in roots, than Nipponbare
cv., which translocated more nutrients to shoots. Nipponbare cv. presented higher levels of Fe
reductase activity, which was significantly up-regulated by Fe deficiency, and had higher expression
levels of the Strategy I-OsFRO2 gene in roots, while Bico Branco cv. induced more genes involved in
Strategy II.
These new findings show that rice cultivars have different responses to Fe deficiency and that the
induction of Strategy I or II may be rice cultivar-dependent, although the utilization of the reduction
mechanisms seems to be an ubiquitous advantage.
Description
Keywords
Bico Branco Fe deficiency Fe homeostasis Nipponbare Strategy I Strategy II
Citation
PEREIRA, Margarida P… [et al.] - Cultivar variability of iron uptake mechanisms in rice (Oryza sativa L.). Plant Physiology and Biochemistry. ISSN 0981-9428. Vol. 85 (2014), p. 21–30
Publisher
Elsevier