The effect of @entity2272 on root growth, secondary-root formation and root gravitropism in seedlings of @entity2829 was investigated by using @entity28253 -treated seedlings and a viviparous mutant, both of which lack carotenoids and @entity2272 . Primary roots of seedlings grown in the presence of @entity28253 grew significantly slower than those of control (i.e. untreated) roots. Elongation of @entity28253 -treated roots was inhibited significantly by the exogenous application of 1 mM @entity2272 . Exogenous application of 1 micromole and 1 nmole @entity2272 had either no effect or only a slight stimulatory effect on root elongation, depending on the method of application. The absence of @entity2272 in @entity28253 -treated plants was not an important factor in secondary-root formation in seedlings less than 9-10 d old. However, @entity2272 may suppress secondary-root formation in older seedlings, since 11-d-old control seedlings had significantly fewer secondary roots than @entity28253 -treated seedlings. Roots of @entity28253 -treated and control seedlings were graviresponsive. Similar data were obtained for vp-9 mutants of @entity2829 , which are phenotypically identical to @entity28253 -treated seedlings. These results indicate that @entity2272 is necessary for neither secondary-root formation nor for positive gravitropism by primary roots.

Root growth, secondary root formation and root gravitropism in carotenoid-deficient seedlings of XXXX .

@entity2272 :: ('CHEBI:2365', 'Chemical') :: ['ABA'] @entity28253 :: ('MESH:C013351', 'Chemical') :: ['Fluridone'] @entity2829 :: ('4577', 'Species') :: ['Zea mays', 'Z. mays']
@entity2829 :: (4577,Species) :: ['Zea mays L']
