TY  - JOUR
A1  - Lisso, Janina
A1  - Schröder, Florian
A1  - Müssig, Carsten
T1  - EXO modifies sucrose and trehalose responses and connects the extracellular carbon status to growth
JF  - Frontiers in plant science
N2  - Plants have the capacity to adapt growth to changing environmental conditions. This implies the modulation of metabolism according to the availability of carbon (C). Particular interest in the response to the C availability is based on the increasing atmospheric levels of CO2. Several regulatory pathways that link the C status to growth have emerged. The extracellular EXO protein is essential for cell expansion and promotes shoot and root growth. Homologous proteins were identified in evolutionarily distant green plants. We show here that the EXO protein connects growth with C responses. The exo mutant displayed altered responses to exogenous sucrose supplemented to the growth medium. Impaired growth of the mutant in synthetic medium was associated with the accumulation of starch and anthocyanins, altered expression of sugar-responsive genes, and increased abscisic acid levels. Thus, EXO modulates several responses related to the C availability. Growth retardation on medium supplemented with 2-deoxy-glucose, mannose, and palatinose was similar to the wildtype. Trehalose feeding stimulated root growth and shoot biomass production of exoplants where as it inhibited growth of the wildtype. The phenotypic features of the exo mutant suggest that apoplastic processes coordinate growth and C responses.
KW  - EXO
KW  - growth
KW  - sugar response
KW  - trehalose
KW  - apoplast
Y1  - 2013
U6  - https://doi.org/10.3389/fpls.2013.00219
SN  - 1664-462X
VL  - 4
IS  - 25
PB  - Frontiers Research Foundation
CY  - Lausanne
ER  -