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ROOT INITIATION [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2017-11-22

English

Subject field(s)
  • Plant Biology
DEF

A meristem located at the apex of a root or shoot and responsible for increase in length of the organ.

CONT

The formation of new cells, and the initiation of differentiation in plants takes place in specific regions called meristems. Meristems can also be categorized. The apical meristems occur in the shoot and root tips. Apical meristems are the source of all other meristems. They form the three primary meristematic tissues(or primary meristems) : protoderm, ground meristem, and procambium. These three primary meristems will differentiate into the three primary tissues : epidermis, ground tissues(pith and cortex) and vascular tissues(xylem and phloem).

French

Domaine(s)
  • Biologie végétale
CONT

Suivant leur localisation dans la plante et leur rôle dans la constitution des tissus différenciés, on distingue deux types de méristèmes : les méristèmes primaires et les méristèmes secondaires, ou cambiums. Les méristèmes primaires regroupent : - les méristèmes apicaux ou terminaux, situés à l'extrémité des tiges ou des racines et formés de petites cellules isodiamétriques jointives; - les méristèmes intercalaires, intercalés dans des tissus déjà différenciés et permettant, par division cellulaire active, l'allongement des entre-nœuds. Les méristèmes secondaires, situés dans les parties âgées des racines et des tiges, donnent naissance à des couches cellulaires cylindriques et assurent la croissance en épaisseur.

Spanish

Campo(s) temático(s)
  • Biología vegetal
Save record 1

Record 2 2011-05-16

English

Subject field(s)
  • Geochemistry
  • Soil Science
DEF

A yellow to yellow-brown humic substance that is soluble in water under all pH conditions.

CONT

A constituent of humus, fulvic acids are amino acids that emerge from a process of decomposition of organic matter. They operate enzymatically within seed tissue to increase water absorption, respiration, and speed germination; they also enhance root initiation and act as a growth hormone to increase secondary and lateral root development.

French

Domaine(s)
  • Géochimie
  • Science du sol
DEF

Ensemble des matières humiques peu polymérisées qui restent en solution dans un extrait alcalin d'humus après acidification.

Spanish

Campo(s) temático(s)
  • Geoquímica
  • Ciencia del suelo
Save record 2

Record 3 2003-05-14

English

Subject field(s)
  • Botany
  • Biotechnology
OBS

Lateral roots are initiated by cell division in the pericycle of the parent root member; the initiation of laterals is usually confined to the unbranched apical zone of roots.

French

Domaine(s)
  • Botanique
  • Biotechnologie

Spanish

Campo(s) temático(s)
  • Botánica
  • Biotecnología
Save record 3

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