CERTAIN STRUCTURAL RESPONSES OF TWO MAIZE CVS. DIFFERing IN THEIR SALT TOLERANCE TO TRACE· ELEMENTS UNDER SALINE CONDITIONS | ||
| Journal of Plant Production | ||
| Article 12, Volume 30, Issue 7, July 2005, Pages 3827-3842 PDF (2.62 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2005.237426 | ||
| Authors | ||
| M. N. Helaly,; A. A. Arafa; R. A. Fouda | ||
| . Agric. Botany Dept., Fac. Agrlc., Mansoura Univ., Mansoura, Egypt. | ||
| Abstract | ||
| The effects of both salinity at 2.5 dsrn and foliar application with some trace-elements. i.e., Zn, Fe and Mn each alone or in combination on growth and anatomical structure of both roots and leaves of two maize cultivars differing in their salt tolerance were investigated. The role of the trace-elements on recovery the adverse effects of salinity was also studied. Salinity at 2.5 dsrn' significantly decreased plant height, leaf area (cm2Iplant). number and length of adventitious roots during the two growing seasons. The effects of salinity was more pronounced in salt sensitive cultivar, (two 310) than the other one. Under both salinized and non-sallnized conditions. treatments with micronutrients each alone or in combinations not only increased all the above mentioned growth parameters compared with control, but also counteracted the harmful effects of salinity. Treatments with zinc alone or in combination were the most effective in this respect. Anatomically, salinity decreased root diameter, exodermis thickness, cortex thickness, endodermal layer thickness and vascular cylinder diameter. In addition. salinity decreased thickness of the leaf in keel region, upper and lower epidermis and mesophyll tissue as well as large vascular bundle dimensions due to its effects on decreasing thickness of xylem and phloem tissues. Me~axylem vessel diameters were also decreased. Trace-element treatments each alone or in combinations increased all the above mentioned anatomical pararnete-s. Treatment with zinc alone or in combination proved to be more effective in t~· s respect. It seems that. develcornent .;( an extensive root system, formation of aerenchyma in the cortex tissue, early formation of exodermis play an important role not only in the adaptive mechanism to salinity but also in improvement plant tolerance to salinity. | ||
| Keywords | ||
| Maize. salinity; salt tolerance. trace elements. Zinc. Iron; Manganese. plant structure | ||
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