الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 32 |  |  |
| | | from | 32 | | |
Abstract
This thesis aimed to study the ecophysiological investigation on 17 aquatic macrophytic species with different life forms as floating, emergent and submergent, naturally growing in five different ecoregions as River Nile and some irrigation and draing canals in representing gradient of habitat diversity in two consecutive season including the flood and shallow period. Using recent software as SPSS ver. 23 to discuss the effect of studied parameters as seasonality, habitat diversity, plant species and their interaction on these ecophysiological parameters. The data revealed that:
In brief data obtained showed that
As non-usual, amino acidscontent in R.N; IB; Moheit drainage habitat was lower in shallow season.
Phr.aus and Sac.spo and Spo.spi are higher accumulator amino acidsspecies while, Myr.spi, Cyp.alo and Typ.dom considered as low accumulator species.
1.Shallow season was the higher and more active season compared to the flood on in most habitats for most measured parameters.
2.The mean average of osmatic potential in species of selected habitats in shallow season, were in order of INFM>Ib>BY>R.N. while Mohiet drain represent the lower one. In flood season slightly difference canals, while both INFM and Mohiet still have higher and lower O.P. value respectively. where Spo.spe registered the high O.P while Lem.min as a lower O.P in both seasons.
3.Regarding to soluble sugars, Phr.aus and Sac.spo and are higher accumulator soluble sugar species while, Eic.cra, Cyp.alp considered as lpw accumulator species.
4.Concerning protein accumulation, it was higher in shallow than in flood season in all studied habitats except IB and R.N. respectively. Phr.aus is the most accumulator soluble protein species.
5.For amino acids, generally we conclude, as non- usual, A.A content in R.N:Ib; Mohiet drainage habitat was lower in shallow season. Phr.aus and Sac.spo and Spo.spi are higher accumulator A.A species while, Myr.Spe, Cyp.alo and Typ.dom considered as low accumulator species.
6.Regarding Cl accumulation slightly higher in species naturally growing in shallow (1.9 mg.g-1/d.wt) than in flood season (1.8 mg.g-1 /d.wt) Inland fresh marsh, followed by B.Y.C. and Moheit drainage were higher eco-regions in shallow season and vice versa for Ibrahemia followed by River Nile in flood season. Inland fresh marsh and Moheit drainage spp. were the higher and lower eco- regions in chloride content in shallow and flood season respectively. Sac. Spo and Phr.aus were the hyper accumulator species among studied species in most habitat in shallow as well as flood season.
7.For nitrate concentration, generally, the nitrate accumulation were higher in shallow season than in flood season in all selected habitat by more or less 2-3 times in the following order:
8.INFM>B.Y.C>Ib>R.N>Moh in shallow season and INFM >Ib>R.N>B.Y.C>M in flood season. This confirm that INFM and Moh have higher and lower nitrate content in shallow and flood season respectively ,while other habitats were in between and clearly affected by seasonally table 1(due to water resource).
9.Concerning for PO4- accumulation was higher in shallow season than flood season by 1-2 folds in most habitats. Phr.aus was predominant accumulator species than others in both studied season while Myr.spi was minimum accumulator species in both season (Fig 3-f). The data obtained showed that SO4-2 was higher in shallow than in flood season by 1-3 folds in most habitats INFM spp. has more SO4-2 content compared to other species in different habitat. It can be said in this habitat that Spo.spi as well as Typ.dom have maximum and minimum concentration of SO4-2 in shallow and flood season respectively, (Fig 4-f). Phr. aus are the most dominate SO4 accumulator followed by Spo.spi in both season and Ech .col in shallow season and Sac.spo in flood season.
10.Regarding Ca accumulation the data obtained shoed it was higher in shallow about 1.5 to 3 folds than that in flood season in all studied habitats .Repeated accumulation of Ca in species of different habitat in both season. Phr.aus has the high Ca+2 content in most habitats except in Inland fresh Marsh, Spo.spi was the highest one. INFM followed by Ib were the higher Ca+2 accumulator regions, while M species was the hypo accumulator one in B.Y.C and R.N were in between. Spo.spi which inhabiting INFM; Sac.spo in Ib and Phr.aus in B.Y.C and R.N considered higher accumulator species in both season.
11.Concerning The Mg+2accumulations were higher in species growing in shallow 6 times than flood season. In.f.M followed by B.Y.C and Ib were the high ecoregions accumulating Mg content in shallow season, while R.N and M were the lower ecoregions accumulating Mg content. On the other hand in flood season, In.f.M&R.N followed by Ib were the hyper accumulating eco regions compared to B.Y.C and Moheit drainage.
12.For Na content it was higher in all studied habitats in shallow season except in R.N. Typ.dom has high Na+ concentration in R.N habitat under both season .the same was true for Myr.spi in Ib habitat and Spo.spi in Inland .F.M habitat.
13.Regarding K, The mean average of K content was high in shallow than in flood in all habitats and inland was the highest and Moheit was lowest. Phr.aus was high accumulator species in R.N in both season and in Ib in flood; Moheit in both seasons, B.Y.C in flood, and Inland f.M in flood Sac.spo in Ib and in B. Y.C in flood.
14.Concerning K+/Na + the data obtained showed the K+/Na + ratio in shallow season was higher about two times (5.33± 0.4 mg.g-ı/d.wt) than that in flood season (2.45±0.12 mg.g-ı/d.wt) in shallow season the maximum K+/Na+ratio (16.91± 1.6 mg.g-ı/d.wt) was obtained in Phr. aus while the minimum (1 ±0.01 mg.g-ı/d.wt) was detected in Jun. rig. In flood season Jun. rig represent the highest K+/Na+ ratio (4.7± 0.23 mg.g-ı/d.wt) while Spo. spi represent the lowest K+/Na+ ratio (0.7 ± 0.2 mg.g-ı/d.wt)
15.Finally, it can be concluded that the adverse effects of shallow/ flood cycling on various physiological and biochemical aspects in plants can come from the difference in the methods of osmotic adjustment and water relation in plant tissues, and the differences between plant species in achieving these biosorptions and accumulations could explain the difference in environmental tolerance.