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Advisor(s)
Abstract(s)
Background and aims Iron deficiency chlorosis (IDC)
leads to severe leaf chlorosis, low photosynthetic rates,
and yield reductions of several million metric tonnes
each year. In order to devise breeding and genetic transformation
programs that aim at generating high-yielding
and IDC-tolerant soybean lines, it is necessary to better
understand the mechanisms that enable tolerant plants to
survive under Fe-limiting conditions.
Methods An in silico analysis in the USDA soybean
collection allowed the identification of a set of novel
efficient and inefficient soybean cultivars which can be
used in future studies concerning IDC response. Plants
were grown in iron deficient and iron sufficient conditions
using a bicarbonate system and several IDCrelated
aspects were studied.
Results A new set of efficient and inefficient soybean
lines were identified in silico, and their tolerance to IDC
was confirmed under laboratorial conditions. New plant
traits that are highly correlated to IDC scoring were
identified: a negative correlation was found between
SPADvalues and stemweight,weight of the unifoliolates
and iron concentration of the first unifoliolates was
found; higher SPAD values were correlated with the
amount of iron in the first trifoliate leaves. Our data also
show that having higher concentrations of iron in the
seeds provides increased resistance to IDC. No correlation
was found between root iron reductase activity and
chlorosis.
Conclusions Soybean differential chlorosis susceptibility
between different accessions is linked to specific
morpho-physiological parameters such as unifoliolate
leaf size, stem weigh, concentration of iron in the seeds,
and tissue iron partitioning.
Description
Keywords
IDC Iron Reductase Soybean Trifoliate Unifoliolate
Citation
VASCONCELOS, Marta; GRUSAK, Michael A. - Morpho-physiological parameters affecting iron deficiency chlorosis in soybean (Glycine max L.). Plant Soil. ISSN 1573-5036 . Vol. 374 (2014), p. 161–172
Publisher
Springer