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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Exodermis differentiation under nutrient deficiency, effects of phytohormones.
 Namyslov, Jiří ; Tylová, Edita (advisor) ; Martinka, Michal (referee)
Apoplastic barriers (exodermis and endodermis) control free movement of substances by apoplast, which is achieved by specific cell wall modifications. Differentiation of these barriers is to some extent variable. It has been demonstrated many times that the differentiation of root apoplastic barriers is strongly influenced by unfavourable environmental conditions. Many stress factors accelerate the deposition of apoplastic barriers. This work deals with the relationship between availability of nutrients and development of root barriers and mechanisms of coordination of developmental processes in roots, including the involvement of auxin and other phytohormones in the coordination of these processes. The exodermis developmental plasticity is followed in maize (Zea mays L.) under conditions of various nutrient deficiencies. The most important results are presented by anatomical analysis, which shows a significant acceleration of exodermis and endodermis differentiation in the N and P deficiency on the contrary, the slowing of differentiation in the absence of Fe and K. This effect is apparently a result of systemic rather than local root system responses because it was not observed with localized deficiency. This thesis also test the influence of some phytohormones on the development of apoplastic...
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The development of lateral roots and apoplastic barriers in maize (zea mays L.) root system
 Pecková, Eva ; Soukup, Aleš (advisor) ; Čiamporová, Milada (referee) ; Martinka, Michal (referee)
ABSTRACT The formation of plant root system is an important ecophysiological and agronomical parameter and also an actual topic of developmental plant biology. Lateral roots are its very important part which creates majority of the main absorbent portion of the plant surface in the rhizosphere. One of the few described mutants (except the model plant Arabidopsis thaliana) with impaired development of lateral roots in early postembryonic development is maize (Zea mays) mutant lrt1 (lateral rootless 1). Our detailed anatomical-morphological study of lrt1 provides new insight into LRT1 gene function. We found out that initiation of lrt1 primordia takes place and is strongly dependent on environmental conditions. The structure of primordia, also their emergence and later development is strongly affected. On the contrary, the main roots do not show so strong influence by this mutation, although some disruptions were found in surface root layers. These disturbances were connected with induced lignification, increased activity of peroxidase and with changes in permeation of root surface. Changes in permeability of surface layers led us to the issue of apoplastic barriers, what was dealt to the traditional and previously tested another genotype of maize (Z. mays). Our work provides a unique insight into...
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