Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Enhanced transpiration rate in the high pigment 1 tomato mutant and its physiological significance
AU - Carvalho, R. F.
AU - Aidar, S. T.
AU - Azevedo, R. A.
AU - Dodd, I. C.
AU - Peres, L. E. P.
PY - 2011/5
Y1 - 2011/5
N2 - Tomato high pigment (hp) mutants represent an interesting horticultural resource due to their enhanced accumulation of carotenoids, flavonoids and vitamin C. Since hp mutants are known for their exaggerated light responses, the molecules accumulated are likely to be antioxidants, recruited to deal with light and others stresses. Further phenotypes displayed by hp mutations are reduced growth and an apparent disturbance in water loss. Here, we examined the impact of the hp1 mutation and its near isogenic line cv Micro-Tom (MT) on stomatal conductance (gs), transpiration (E), CO2 assimilation (A) and water use efficiency (WUE). Detached hp1 leaves lost water more rapidly than control leaves, but this behaviour was reversed by exogenous abscisic acid (ABA), indicating the ability of hp1 to respond to this hormone. Although attached hp1 leaves had enhanced gs, E and A compared to control leaves, genotypic differences were lost when water was withheld. Both instantaneous leaf-level WUE and long-term whole plant WUE did not differ between hp1 and MT. Our results indicate a link between exaggerated light response and water loss in hp1, which has important implications for the use of this mutant in both basic and horticultural research.
AB - Tomato high pigment (hp) mutants represent an interesting horticultural resource due to their enhanced accumulation of carotenoids, flavonoids and vitamin C. Since hp mutants are known for their exaggerated light responses, the molecules accumulated are likely to be antioxidants, recruited to deal with light and others stresses. Further phenotypes displayed by hp mutations are reduced growth and an apparent disturbance in water loss. Here, we examined the impact of the hp1 mutation and its near isogenic line cv Micro-Tom (MT) on stomatal conductance (gs), transpiration (E), CO2 assimilation (A) and water use efficiency (WUE). Detached hp1 leaves lost water more rapidly than control leaves, but this behaviour was reversed by exogenous abscisic acid (ABA), indicating the ability of hp1 to respond to this hormone. Although attached hp1 leaves had enhanced gs, E and A compared to control leaves, genotypic differences were lost when water was withheld. Both instantaneous leaf-level WUE and long-term whole plant WUE did not differ between hp1 and MT. Our results indicate a link between exaggerated light response and water loss in hp1, which has important implications for the use of this mutant in both basic and horticultural research.
KW - Light response
KW - tomato mutant
KW - transpiration
KW - water use efficiency
KW - HIGH-PIGMENT
KW - ABSCISIC-ACID
KW - DARK-GREEN
KW - IN-VITRO
KW - ARABIDOPSIS
KW - SENSITIVITY
KW - PHENOTYPE
KW - ETHYLENE
KW - MUTATION
KW - HOMOLOG
U2 - 10.1111/j.1438-8677.2010.00438.x
DO - 10.1111/j.1438-8677.2010.00438.x
M3 - Journal article
VL - 13
SP - 546
EP - 550
JO - Plant Biology
JF - Plant Biology
SN - 1435-8603
IS - 3
ER -