Abstract
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1.
The transfer of immature embryos from maternal plants to artificial media influenced the radial arrangement of vascular bundles in developing root primordia. The variability in the number of poles of the prospective protoxylem and protophloem, observed as a rule during embryogenesis under natural conditions, could not be suppressed even under the conditions ofin vitro cultivation. The possibility is admitted that when using agar medium the nutrient supply need not necessarily be equivalent for all embryos.
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2.
Using excised embryos of various ages the period of delimination of the vascular system in the root primordium was determined. It is relatively short and occurs in the first half of embryogenesis. The results obtained revealed no relationship between vascular system arrangement in root primordium and mature grain and mature embryo size.
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3.
Maize ear represents a type of inflorescence of which the apical part is delayed in development. Histogenically this uneven development becomes evident with the formation of a significantly lower mean number of poles in root primordia from the grains originating from the apical region of the cob. This is further evidence of the adaptibility of the vascular system development to environmental conditions.
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4.
As further causes of the variability in pole number those differences are considered which occur during sex cell formation, pollination and fertilization.
Abstract
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1.
Prenosom nezrelých embryí z materských rastlín do umelého prostredia sa ovplyvnilo radiálne usporiadanie cievnych zväzkov vo formujúcich sa koreňových primordiách. Variabilitu v počte pólov prospektívneho protoxylému a protofloému, pravidelne pozorovanú pri embryogenéze v prirodzených podmienkach, sa však nepodarilo odstránit' ani v podmienkach kultiváciein vitro. Pripúšt'a sa možnost', že při použití agarovej pòdy nemuseli mat' všetky embryá zaručený rovnocenný prísun živín.
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2.
Použitím ròzne starých excisovaných embryí sa vymedzil časový úsek, na ktorý pripadá v koreňovom primordiu determinácia vodivého systému. Je pomerne krátky a spadá do prvej polovice embryogenézy. Zistené údaje vysvetl'ujú nedostatok vzt'ahu usporiadania vodivého systému v koreňovom primordiu k vel'kosti zrelého zrna a k vel'kosti zrelého embrya.
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3.
Klas kukurice je typom súkvetia, u ktorého je apikálna oblast' oneskorená vo vývine. Histogeneticky sa tento nerovnomerný vývin prejaví vytvorením preukazne nižšieho priemerného počtu pólov v koreňových primordiách u zŕn z apikálnej oblasti šúl'ka. Je to d'alší dòkaz prispòsobivosti vývinu vodivého systému vonkajším podmienkam.
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4.
Ako dal'šie príčiny variability počtu pólov sa uvažujú rozdiely, ku ktorým dochádza pri vzniku pohlavných buniek, pri opelení a pri oplodnení.
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Luxová, M. Concerning variability in the delimitation of the vascular system in root primordia of maize embryos. Biol Plant 13, 79–87 (1971). https://doi.org/10.1007/BF02930751
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DOI: https://doi.org/10.1007/BF02930751