Graviresponsiveness and abscisic-acid content of roots of carotenoid-deficient mutants of Zea mays L.

Randy Moore, James D. Smith

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40 Scopus citations

Abstract

The abscisic-acid (ABA) content of roots of the carotenoid-deficient w-3, vp-5, and vp-7 mutants of Z. mays was analyzed using gas chromatography-mass spectrometry with an analysis sensitivity of 6 ng ABA g-1 fresh weight (FW). Roots of normal seedlings of the same lines were characterized by the following amounts of ABA (as ng ABA g-1 FW,±standard deviation): w-3, 279±43; vp-5, 237±26; vp-7, 338±61. We did not detect any ABA in roots of any of the mutants. Thus, the lack of carotenoids in these mutants correlated positively with the apparent absence of ABA. Primary roots of normal and mutant seedlings were positively gravitropic, with no significant differences in the curvatures of roots of normal as compared with mutant seedlings. These results indicate that ABA 1) is synthesized in maize roots via the carotenoid pathway, and 2) is not necesary for positive gravitropism by primary roots of Z. mays.

Original languageEnglish (US)
Pages (from-to)126-128
Number of pages3
JournalPlanta
Volume164
Issue number1
DOIs
StatePublished - May 1 1985

Keywords

  • Abscisic acid and root gravitropism
  • Carotenoid-deficient mutants
  • Gravitropism (root)
  • Mutant (Zea)
  • Zea (root gravitropism)

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