Interplay Between Environmental Signals and Endogenous Salicylic Acid Concentration - Salicylic Acid: Plant Growth and Development - page 76

that the observed changes in endogenous SA levels play a direct role in adjusting
plant growth in response to fluctuating environmental signals. Rather, as is evident
from application studies with exogenous SA, it appears more likely that changes in
endogenous SA levels result from cross-talk with other endogenous plant hor-
mones. Thus, it will be changes in concentration of the other hormones (not SA)
that are responsible for adjusting the plant's growth in response to the fluctuating
environmental signal. For example, another class of plant hormones, brassinos-
teroids, when applied exogenously, can alleviate many plant abiotic stress
responses (Khripach et al. 1999 ; Kang and Guo 2011 ). However, this stress alle-
viation is likely a result of the brassinosteroid influencing endogenous levels of
other plant hormones, which then play a direct role in the alleviation of symptoms
of plant stress (Kurepin et al. 2008 , 2012b ).

Acknowledgments This work was sponsored by Ballance Agri-Nutrients, Ltd., New Zealand.

References

Abass, M., & Rajashekar, C. B. (1993). Abscisic acid accumulation in leaves and cultured cells
during heat acclimation in grapes. HortScience, 28, 50-52.
Abreu, M. E., & Munne-Bosch, S. (2008). Salicylic acid may be involved in the regulation of
drought-induced leaf senescence in perennials: A case study in field-grown Salvia officinalis
L. plants. Environmental and Experimental Botany, 64, 105-112.
Assmann, S. M. (2010). Abscisic acid signal transduction in stomatal responses. In P. J. Davies
(Ed.), Plant hormones: Biosynthesis, signal transduction and action! (3rd ed., pp. 399-426).
Dordrecht, Heidelberg: Springer.
Bandurska, H., & Stroinski, A. (2005). The effect of salicylic acid on barley response to water
deficit. Acta Physiologiae Plantarum, 27, 379-386.
Bechtold, U., Lawson, T., Mejia-Carranza, J., Meyer, R. C., Brown, I. R., Altmann, T., et al.
(2010). Constitutive salicylic acid defences do not compromise seed yield, drought tolerance
and water productivity in the Arabidopsis accession C24. Plant, Cell and Environment, 33,
1959-1973.
Bowling, S. A., Guo, A., Cao, H., Gordon, A. S., Klessig, D. F., & Dong, X. (1994). A mutation
in Arabidopsis that leads to constitutive expression of systemic acquired resistance. Plant
Cell, 6, 1845-1857.
Bowling, S. A., Clarke, J. D., Liu, Y., Klessig, D. F., & Dong, X. (1997). The cpr5 mutant of
Arabidopsis expresses both NPR1-dependent and NPR1-independent resistance. Plant Cell, 9,
1573-1584.
Catinot, J., Buchala, A., Abou-Mansour, E., & Metraux, J.-P. (2008). Salicylic acid production in
response to biotic and abiotic stress depends on isochorismate in Nicotiana benthamiana.
FEBS Letters, 582, 473-478.
Chandler, P. M., & Robertson, M. (1994). Gene expression regulated by abscisic acid and its
relation to stress tolerance. Annual Review of Plant Physiology and Plant Molecular Biology,
45, 113-141.
Chen, Z., Silva, H., & Klessig, D. F. (1993). Active oxygen species in the induction of plant
systemic acquired resistance by salicylic acid. Science, 262, 1883-1886.
Chen, Z. Q., Chen, W. L., & Yang, C. W. (2009). Effects of exogenous salicylic acid on
photosynthesis in Arabidopsis leaves based on fluorescence spectra and delayed fluorescence
technique. Spectroscopy and Spectral Analysis, 29, 2208-2212.