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Changes in photosynthesis caused by adaptation of maize seedlings to short-term drought

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Abstract

Detached leaf is in the state of increasing water deficit; it is a good experimental model for looking into the hardening effect of adaptation of eight-day-old maize (Zea mays L.) seedlings to short-term drought (five days without watering). The light stage of photosynthesis and photosynthetic CO2/H2O exchange in detached leaves were studied. Specific surface density of leaf tissue (SSDL), the content of chlorophylls a and b, proline, MDA as well as photosynthetic parameters: quantum yield of photosystem II fluorescence, assimilation of CO2, and transpiration at room temperature and light saturation (density of PAR quantum flux of 2000 μmol/(m2 s)) at normal and half atmospheric CO2 concentration were determined. The leaves of seedlings exposed to short-term drought differed from control material by a greater SSDL and higher content of proline. The hardening effect of the stress agent on the dark stage of photosynthesis was detected; it was expressed in the maintenance of the higher photosynthetic CO2 assimilation against control material due to the elevation of stomatal conductance for CO2 diffusing into the leaf. Judging from the lack of differences in the MDA content, short-term drought did not injure photosynthetic membranes. In detached leaves of experimental maize seedlings, photosynthesis was maintained on a higher level than in control material.

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Abbreviations

Chl:

chlorophyll

POL:

peroxidation of lipids

PS:

photosystem

SSDL:

specific surface density of leaves

TBA:

thiobarbituric acid

TBARS:

TBA-reactive substances

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Correspondence to P. Yu. Voronin.

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Original Russian Text © P.Yu. Voronin, Z.F. Rakhmankulova, S.N. Maevskaya, M.K. Nikolaeva, E.V. Shuiskaya, 2014, published in Fiziologiya Rastenii, 2014, Vol. 61, No. 1, pp. 143–147.

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Voronin, P.Y., Rakhmankulova, Z.F., Maevskaya, S.N. et al. Changes in photosynthesis caused by adaptation of maize seedlings to short-term drought. Russ J Plant Physiol 61, 131–135 (2014). https://doi.org/10.1134/S1021443714010178

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  • DOI: https://doi.org/10.1134/S1021443714010178

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