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Abstract Detail

Physiological Section

Grzesiak, Maciej [1], Janowiak, Franciszek [1], Szczyrek, Piotr [1], Kaczanowska, Katarzyna [1], Ostrowska, Agnieszka [1], Rut, Grzegorz [2], Rzepka, Andrzej [2], Grzesiak, Stanislaw [3].

Multistress effect of soil compaction combined with drought or waterlogging on changes in physiological characteristics in maize (Zea mays L.) hybrids.

The intraspecific variations within genotypes in response to different stresses are significant, though problems related to combined (multistress) influence of soil moisture and physical soil parameters have not been studied thoroughly. The aim of this study was to examine the response of maize hybrids differing in a tolerance to environmental stresses (Ankora-sensitive, Tina- resistant) on the changes in water potential (ψ), membrane injury (LI), chlorophyll content (SPAD), gas exchange parameters (Pn, E, gS), content of ABA and antioxidant activity. Seedlings were grown in low (L), moderate (M) and severe (S) soil compaction levels and under drought or waterlogging. Diurnal changes of root (ψR) and leaf (ψL) water potential were observed in seedlings subjected to D or W conditions (L+D, S+C, L+W and S+W) treatments. In seedlings grown without watering (D) or waterlogging (W), significant differences between ψR and ψS were observed around noon hours. Under L+D and S+D the differences between ψR and ψL at noon in Ankora were small in comparison to Tina. In seedlings grown under L+W and S+W conditions changes in ψR and ψL were lower in comparison to L+D and S+D treatments. For seedlings grown in M and S conditions and subjected to D or W, membrane injury (LI) for the sensitive hybrid Ankora were higher than in the resistant hybrid Tina. Similarly for L+C and S+C conditions the decrease of SPAD, Pn. E and gS and the increase of (ψL) for Ankora was higher in comparison to Tina. No differences between ABA content in leaf, stem and root of seedlings grown under L+C and S+C were observed. Significant differences between hybrids were observed only for ABA content in the stem of seedlings grown under S+D and in the root for under L+W. Significant differences in antioxidants activity between hybrids were observed in leaf for seedlings grown under S+D, in stem under L+C and L+D and in stem under S+W. Our study indicated that in maize there exists an intraspecific variation to soil compaction level and their combination with drought or waterlogging.
Acknowledgements The authors are grateful to the National Science Centre (NCN) for financial support (Project NN 310 782540).

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1 - Institute of Plant Physiology Polish Academy of Sciences, Department of Ecophysiology, ul. Niezapominajek 21, 3, Krakow, 30-239, Polska
2 - Pedagogical University in Krakow, Institute of Biology, Podchorążych 2, 3, Krakow, 30-084, Polska
3 - Institute of Plant Physiology Polish Academy of Sciences, Department of Ecophysiology, ul. Niezapominajek 21, Krakow, 30-239, Polska

none specified

Presentation Type: Poster:Posters for Sections
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PPS002
Abstract ID:709
Candidate for Awards:None

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