Gravitropism of loblolly pine (Pinus taeda ) radicles after chemical sterilization of seeds.

Abstract


Dexian He and David B. South

Certain types of chemicals can affect the gravitropism of roots. In a laboratory study, intact loblolly pine (Pinus taeda L.) radicles (emerged from H2O2- treated seeds) exhibited positive gravitropism 8 h after horizontal placement in sterile conditions. The growth angle decreased from almost horizontal (85???) to 21??? within one week after treatment (90??? is horizontal and 0??? is vertical). When seeds were treated with HgCl2, radicles under sterile growing conditions expressed gravitropism 6.9 h after horizontal alignment. Growth angle changed from 91??? to 64??? over a 10-day period. Cubic and quadratic functions were used to model growth angle as a function of time. Under similar experimental conditions, radicles from HgCl2-treated seeds showed a greater degree of gravitropism than those from H2O2-treated seeds (as indicated by the growth angle). These results indicate that the gravitropism can occur in sterile environments and that the type of chemicals used to sterilize seeds might affect the rate of geotropic response.

Share this article

Awards Nomination

Select your language of interest to view the total content in your interested language

Indexed In
  • Index Copernicus
  • Google Scholar
  • Sherpa Romeo
  • Open J Gate
  • Academic Keys
  • ResearchBible
  • CiteFactor
  • Electronic Journals Library
  • Centre for Agriculture and Biosciences International (CABI)
  • OCLC- WorldCat
  • Advanced Science Index
  • Leipzig University Library
  • Max Planck Institute
  • GEOMAR Library Ocean Research Information Access
  • WZB
  • ZB MED
  • Wissenschaftskolleg zu Berlin
  • Bibliothekssystem Universität Hamburg
  • ICRISAT
  • Knowledge Content
  • Rootindexing
  • Hochschule Hannover Library
  • MPG Library Database
  • Life Science Portal Library