Guo´th, A. and Tari, I. and Galle, A. and et al, . (2009) Comparison of the Drought Stress Responses of Tolerant and Sensitive Wheat Cultivars During Grain Filling: Changes in Flag Leaf Photosynthetic Activity, ABA Levels, and Grain Yield. Journal of Plant Growth Regulation, 28 (2). pp. 167-176.
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Abstract
Water status parameters, flag leaf photosynthetic activity, abscisic acid (ABA) levels, grain yield, and storage protein contents were investigated in two droughttolerant (Triticum aestivum L. cv. MV Emese and cv. Plainsman V) and two drought-sensitive (cvs. GK E ´ let and Cappelle Desprez) wheat genotypes subjected to soil water deficit during grain filling to characterize physiological traits related to yield. The leaf water potential decreased earlier and at a higher rate in the sensitive than in the tolerant cultivars. The net CO2 assimilation rate (PN) in flag leaves during water deficit did not display a strict correlation with the drought sensitivity of the genotypes. The photosynthetic activity terminated earliest in the tolerant cv. Emese, and the senescence of flag leaves lasted 7 days longer in the sensitive Cappelle Desprez. Soil drought did not induce characteristic differences between sensitive and tolerant cultivars in chlorophyll a fluorescence parameters of flag leaves during post-anthesis. Changes in the effective quantum yield of PSII (UPSII) and the photochemical quenching (qP) depended on the genotypes and not on the sensitivity of cultivars. In contrast, the levels of ABA in the kernels displayed typical fluctuations in the tolerant and in the sensitive cultivars.
| Item Type: | Article |
|---|---|
| Additional Information: | The authors thank Dr. Andra´s Salgo´, Dr. Sa´ndor To¨mo¨sko¨zi, and Tibor Abonyi (Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics, Budapest, Hungary) for the opportunity to perform HPLC measurements in their laboratory. The authors gratefully acknowledge the financial support of the National Office for Research and Technology of the Republic of Hungary (Grant ‘‘Bu´zakala´sz,’’ Grant No. NKFP 4/064/2004, Grant ‘‘Teller Ede,’’ Grant No. 2006ALAP3- 01435/2006, and Grant OTKA, Grant No. T46692). |
| Uncontrolled Keywords: | Abscisic acid (ABA), Chlorophyll fluorescence, Drought stress, Flag leaves, Grain filling, Grain yield, Photosynthesis, Storage proteins, Wheat (Triticum aestivum L.) |
| Author Affiliation: | Department of Plant Biology, University of Szeged, P.O. Box 654, 6701 Szeged, Hungary |
| Subjects: | Plant Production |
| Divisions: | Other Crops |
| Depositing User: | Mr Siva Shankar |
| Date Deposited: | 20 Jun 2012 08:02 |
| Last Modified: | 20 Jun 2012 08:03 |
| Official URL: | http://dx.doi.org/10.1007/s00344-009-9085-8 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/6125 |
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