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Step by step morpho physiological responses of Arachis hypogaea L cv NC 2 to iron deficiency

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Figure 1. Step-by-step morphological changes in the shoot system: (a) appearance of the first chlorosis in the fourth leaves of plants grown in Fe-free media; (b) a typical iron chlorosis symptoms observed at the first chlorosis stage; (c) the first regreening process developed in the youngest leaves but not in already chlorotic leaves; (d) the second chlorosis and regreening stages with different symptoms; (e) a leaf in the second regreen-ing stage; (f) the third and last chlorosis with necrotic areas in the eleventh leaves of the Fe-free media grown plants; (g) regreening and crumpling in already chlorotic leaves of plants grown in Fe-treated (0.125 ppm) media; (h) shoot growths in plants grown in 1 ppm Fe (left and right) and 2 ppm Fe (middle)
Figure 2. Comparison of regreening process in plants grown in Fe-free (left) and Fe-treated (right) media
Figure 4. Step-by-step morphological changes in the root system: (a) the length and thickness of the roots grown in different Fe-treatments (from left to right: 0.00, 0.125, 0.25, 0.50, 1 and 2 ppm Fe); (b) main root end formations at the third chlorosis stage; (e) a flaxy root as a result of root end bending; (f) a snake tail-shaped root; (g) a flaxy root as a result of root end cleavage; (h) formation of lateral roots with swollen ends at the last fracture and the formation of a dense cluster of lateral roots at the first chlorosis stage; (c) appearance of dense secondary roots on the apical axis of lateral roots at the second chlorosis stage; (d) three types of root end mal-stage of plant growth
Figure 5. pH responses in the root system; (a) the changes in the pH of the nutrient solutions with different Fe-treatments during the experimental period; pH of the solutions decreased at chlorosis stages and increased in the regreening processes leading
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