Photosynthetica 2000, 38(4):615-620 | DOI: 10.1023/A:1012421826212

Photosynthesis in Two Wheat Cultivars Differing in Salt Susceptibility

F. El-Shintinawy1
1 Department of Botany, Faculty of Science, Tanta University, Tanta, Egypt

Salinised (150 mM NaCl for 15 d) roots excised from salt sensitive wheat cultivar Giza 163 showed about 15-fold increase in the ratio of Na/K while salt tolerant Sakha 92 exhibited only 7.5-fold increase compared to their control ratios. Root ratio of saturated/unsaturated fatty acids was stimulated twice in the sensitive cultivar versus 1.7-fold increase in the tolerant ones. Salinity enhanced greatly the accumulation of spermine (Spm) and spermidine (Spd) contents associated with a decrease in putrescine (Put) content in both wheat cultivars. Higher ratios of Spm+Spd/Put associated with lower content of proline and low ethylene evolution were detected in shoots and roots of salt tolerant cultivar. Chlorophyll a/b ratio showed an increase from 1.3 in control of both cultivars to 1.6 and 1.4 in stressed Giza 163 and Sakha 92, respectively. A reduced Hill reaction activity (19 %) was observed in stressed chloroplasts isolated from leaves of the tolerant cultivar versus 40 % inhibition in the sensitive ones. Moreover, chloroplasts isolated from stressed leaves of the sensitive cultivar showed about 25 % reduction in fluorescence emission at 685 nm as well as shifts in the peaks in the visible region.

Additional key words: cultivar differences; ethylene; fatty acids; fluorescence emission spectra; polyamines; proline; putrescine; salinity; spermine; spermidine

Prepublished online: August 1, 2000; Published: November 1, 2000  Show citation

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El-Shintinawy, F. (2000). Photosynthesis in Two Wheat Cultivars Differing in Salt Susceptibility. Photosynthetica, 38(4), 615-620. doi: 10.1023/A:1012421826212
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