课件制作

Results
1. Wheat growth: With increasing salt concentrations, the RGR and WC of wheat shoots decreased, and their reducing extents under AS were greater than those under SS . 2 .Pigment contents :Under SS, the contents of Chls and Car were all higher than those of control at 30 mM salinity.
Hale Waihona Puke Baidu
• we can find that SS and AS are two distinctive stresses with different characters. • The destructive effects of AS on the growth and photosynthesis of wheat are more severe than those under SS. • High pH is the key feature of the AS that is different from SS. The buffer capacity is essentially the measure of high pH action on plant.
• Compare the effects of salt and alkali stresses on the growth and photosynthesis of wheat • Relative growth rate (RGR), leaf area, and water content decreased with increasing salinity, and the extents of the reduction under alkali-stress (AS) were greater than those under salt-stress (SS).
Closing words
In the end ,I want to say ,the effects of salt and alkali – stress on the plants, we did not know much more .there are still no specific treatment plan. I hope we can achieve success in this field.
Materials and methods
• Plants :seeds of xiaobingmai 33 • Simulated salt and alkaline condition • Stress treatment • Measurement of physiological indices • Statistical analyses
My opinion of the paper
08生物科学本三 林敏 200807120315
Comparison of effects of salt and alkali stresses on the growth and photosynthesis of wheat
Summary of this paper
Thank you
3.Photosynthesis and leaf area: Under SS, PN of wheat was enhanced and higher than that of control at S , but then turned to decrease slightly with increasing salinity. 4. Contents of Na+, K+, and Na+/K+ ratio: with increasing stress, the contents of Na+ and Na+/K+ ratio increased, while K+ content decreased, and the changes under AS were greater than those under SS .
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5.Correlation and multiple linear regressions:
between salinity and all the photosynthetic indices were insignificant, but the correlations between buffer capacity and all the photosynthetic indices were very significant .
Background
• There are 500 million mu saline in our country，300 million mu of them are no reclamation, so knowing the relationship of plants and saline are particularly important. • The formation of the alkaline soil in our country was connected with the carbonate accumulating ,consequently alkalify degrees was very high.