Root growth, secondary root formation and root gravitropism in carotenoid-deficient seedlings of Zea mays L.

Yuk Kiu Ng, Randy Moore

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The effect of ABA on root growth, secondary-root formation and root gravitropism in seedlings of Zea mays was investigated by using Fluridone-treated seedlings and a viviparous mutant, both of which lack carotenoids and ABA. Primary roots of seedlings grown in the presence of Fluridone grew significantly slower than those of control (i.e. untreated) roots. Elongation of Fluridone-treated roots was inhibited significantly by the exogenous application of 1 mm ABA. Exogenous application of 1 μm and 1 nm ABA had either no effect or only a slight stimulatory effect on root elongation, depending on the method of application. The absence of ABA in Fluridone-treated plants was not an important factor in secondary-root formation in seedlings less than 9-10 d old. However, ABA may suppress secondary-root formation in older seedlings, since 11-d-old control seedlings had significantly fewer secondary roots than Fluridone-treated seedlings. Roots of Fluridone-treated and control seedlings were graviresponsive. Similar data were obtained for vp-9 mutants of Z. mays, which are phenotypically identical to Fluridone-treated seedlings. These results indicate that ABA is necessary for neither secondary-root formation nor for positive gravitropism by primary roots.

Original languageEnglish (US)
Pages (from-to)387-394
Number of pages8
JournalAnnals of Botany
Volume55
Issue number3
DOIs
StatePublished - Jan 1 1985

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gravitropism
fluridone
root growth
carotenoids
Zea mays
seedlings
mutants
application methods

Keywords

  • Carotenoid-deficient
  • Fluridone
  • Gravitropism
  • Root growth
  • Vp-9 mutant
  • Zea mays

Cite this

Root growth, secondary root formation and root gravitropism in carotenoid-deficient seedlings of Zea mays L. / Ng, Yuk Kiu; Moore, Randy.

In: Annals of Botany, Vol. 55, No. 3, 01.01.1985, p. 387-394.

Research output: Contribution to journalArticle

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