Abstract
When comparing conductivity in 5 mm long segments from the basis of the primary seminal root with that in segments from adventitious roots of the first to fifth node it was revealed that the conductivity is not a general function of the transection area. The conductivity determined experimentally is minimal in the primary seminal root and gradually increases in the adventitious roots. However, when calculating per area unit, roots of the first coleoptile node appear the most efficient, with roots of the second and third node the values gradually decrease, and conductivity in roots of the fourth and fifth node approximately equals that of the primary seminal roots.
The conductivity is not a function of the conducting area. The conducting capacity of tissues which do not function directly as conductors is substantially lower; however, they cannot be neglected in evaluating the conductivity because of their high percentual occurence. The total conductivity in the individual root types is influenced by the ratio of the participation of water-conducting and non-conducting tissues.
Abstract
Na základe porovnania konduktivity 5 mm segmentov z bázy primárneho seminálneho koreňa a adventívnych koreňov prvého až piateho uzla sa zistilo, že vodivost' nie je obecnou funkciou plochy prierezu. Exporimentálne stanovená vodivost' je u primárneho seminálneho koreňa najmenšia a u adventívnych koreňov sa postupne zvyšuje. Pri prepočte na jednotku plochy sú však najvýkonnejšie korene prvého koleoptílneho uzla, pre korene druhého a tretieho uzla sa hodnoty postupne znižujú, korene štvrtého a piateho uzla majú vodivost' na jednotku plochy približne rovnakú ako primárne seminálne korene.
Vodivost' nie je ani púhou funkciou vodivej plochy. Pletivá, neslúžiace priamo vodivej funkcii, majú síce vodivú kapacitu podstatne nižšiu, pre ich vysoké percentuálne zastúpenie nie sú však pri hodnotení vodivosti zanedbatelné. Celkovú vodivost' u jednotlivých typov koreňov ovplyvňuje pomer zastúpenia vodivých a nevodivých pletív.
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Luxová, M., Kozinka, V. Structure and conductivity of the corn root system. Biol Plant 12, 47–57 (1970). https://doi.org/10.1007/BF02920878
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DOI: https://doi.org/10.1007/BF02920878