INVESTIGADORES
SANTA MARIA Guillermo Esteban
congresos y reuniones científicas
Título:
MUTANT RHT-1 ALTERED FUNCTION ALLELES INFLUENCE THE RESPONSE OF WHEAT PLANTS TO K+ DEPRIVATION
Autor/es:
MORICONI J; BUET A; SIMONTACCHI M; SANTA MARIA G.E.
Lugar:
San Luís
Reunión:
Congreso; XLVII Reunión Anual de la Sociedad Argentina de Investigación en Bioquímica y Biología Molecular; 2011
Institución organizadora:
SAIB
Resumen:
MUTANT RHT-1 ALTERED FUNCTION ALLELES
INFLUENCE THE RESPONSE OF WHEAT PLANTS TO K+
DEPRIVATION
Moriconi JI1, Buet A2, Simontachi M2, Santa-María GE1.
1IIB-INTECH CONICET-UNSAM. 2INFIVE CONICET-UNLP.
E-mail: gsantama@iib.unsam.edu.ar
Potassium (K+) is an essential nutrient for plant growth and
development. The pathway by which higher plants restrict their
growth under K+ deprivation conditions is not well understood. In
bread wheat (Triticum aestivum), DELLA proteins are encoded by
the Rht-1B and Rht-1D genes: the allelic variants Rht-1Ba/Rht-
1Da, determine a wild type (WT) phenotype, while the presence of
the Rht-B1b /Rht-D1b altered function alleles determine a dwarf
phenotype (DD). In this work, we evaluated the role of those alleles
during the acclimation of plants to K+ deprivation by using two set of
near isogenic lines (NILs) of Maringa and April Bearded cultivars.
Chlorophyll content of WT NILs sharply declined after a 16 d period
of K+-deprivationm while in DD NILs chlorophyll content only
marginally declined. This difference was companied in Maringa,
but not in April Bearded, by a positive impact on plant growth. In
turn, no differences between WT and DD NILs were observed for
indicators of oxidative damage oxidative. However, DD NILs of
both cultivars exhibited an increased induction of ascorbate
peroxidase and superoxide dismutase activities, as well as changes
in the ionic composition (K+, Na+, Ca2+) of plants grown without K+-
addition. Our data indicate that the acclimation response to K+-
starvation is strongly influenced by the presence of altered function
alleles.