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Struktura kořenového systému kukuřice seté; vliv fytohormonů
Husáková, Eva
Abstract_____________________________________________________________________________________________________________ 116 7. ABSTRACT Root structure of maize; effect of phytohormones This work is aimed to study the influence of the ethylene-synthesis inhibitor (1-AOA, aminooxoacetic acid) and a synthetic auxin-analogue (1-NAA, naphtylacetic acid) on the main-root structure development of maize (Zea mays L.) cv. Cefran with emphasis on aerenchyma formation. In maize, aerenchyma is induced by hypoxia, substrate mechanical impedance or ethylene. Therefore the plants have been cultivated not only in hydropony, but in a special "paper cultivation" minimizing stress influence of the environment too. A strong impact of cultivation conditions has been detected, especially concerning the amount and type of illumination. The most extended aerenchyma has been found in the middle of the main root-length, the least at the root base, with no difference among the treatments. Aerenchyma is probably formed by the process of programmed cell death (PCD). There is an important role of ethylene in the signalling pathway. It has been proved that auxin stimulates its synthesis. High concentrations of 1-NAA have inhibited the plant growth, in comparison with the concentration of 5.10-11 M, that has stimulated the shoot and root...
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