Photosynthetica 2006, 44(4):606-614 | DOI: 10.1007/s11099-006-0079-5

Effects of abscisic acid or benzyladenine on pigment contents, chlorophyll fluorescence, and chloroplast ultrastructure during water stress and after rehydration

D. Haisel1, J. Pospíšilová1,*, H. Synková1, R. Schnablová1, P. Baťková1
1 Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Praha 6, Czech Republic

With the aim to contribute to the elucidation of the role of phytohormones in response of plants to adverse environmental conditions, seedlings of Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea mays were supplied with water, 100 µM abscisic acid (ABA), or 10 µM N6-benzyladenine (BA) immediately before imposition of water stress (WS). In all four species, contents of chlorophylls (Chls) and carotenoids were markedly decreased during WS and after rehydration only in plants pre-treated with water but not in those pre-treated with ABA or BA. Contents of pigments of xanthophyll cycle increased during WS more in plants pre-treated with ABA or BA than in those pre-treated with water, but the degree of their de-epoxidation was highest in the later. Similarly, the efficiency of photosystem 2, determined as variable to maximal Chl fluorescence ratio, was not markedly decreased in bean plants pre-treated with ABA or BA in contrast to those pre-treated with water. The imposed WS was not severe enough to damage chloroplast ultrastructure. However, different changes in a size of starch inclusions were observed. In bean plants, the amount of starch increased considerably in plants pre-treated with water, while it decreased in BA pre-treated plants and no change was found in ABA pre-treated ones. The starch content declined under WS in sugar beet and tobacco plants but only moderate changes were found in ABA or BA pre-treated plants. Thus the application of BA and especially of ABA reduced the negative effects of subsequent WS.

Additional key words: Beta vulgaris; carotenoids; Nicotiana tabacum; Phaseolus vulgaris; starch content; xanthophylls; Zea mays

Received: June 12, 2006; Accepted: September 7, 2006; Published: December 1, 2006  Show citation

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Haisel, D., Pospíšilová, J., Synková, H., Schnablová, R., & Baťková, P. (2006). Effects of abscisic acid or benzyladenine on pigment contents, chlorophyll fluorescence, and chloroplast ultrastructure during water stress and after rehydration. Photosynthetica, 44(4), 606-614. doi: 10.1007/s11099-006-0079-5
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