1989
DOI: 10.1104/pp.91.3.804
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Auxin Physiology of the Tomato Mutant diageotropica

Abstract: The tomato (Lycopersicon esculentum, Mill.) mutant diageotropica (dgt) exhibits biochemical, physiological, and morphological abnormalities that suggest the mutation may have affected a primary site of auxin perception or action. We have compared two aspects of the auxin physiology of dgt and wild-type (VFN8) seedlings: auxin transport and cellular growth parameters. The rates of basipetal indole-3-acetic acid (IAA) polar transport are identical in hypocotyl sections of the two genotypes, but dgt sections have… Show more

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Cited by 39 publications
(40 citation statements)
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“…Two earlier works reported unchanged PAT in dgt (Daniel et al, 1989;Muday et al, 1995). However, it is important to note that both studies detected increased transport of radiolabelled IAA in dgt hypocotyls (Daniel et al, 1989, Fig.…”
Section: Discussionmentioning
confidence: 80%
See 1 more Smart Citation
“…Two earlier works reported unchanged PAT in dgt (Daniel et al, 1989;Muday et al, 1995). However, it is important to note that both studies detected increased transport of radiolabelled IAA in dgt hypocotyls (Daniel et al, 1989, Fig.…”
Section: Discussionmentioning
confidence: 80%
“…Protoplasts from dgt hypocotyls do not swell but instead decrease in volume when treated with auxin or antibodies against AUXIN BINDING PROTEIN 1 (ABP1), further suggesting an abnormal auxin response (Christian et al, 2003). Previous work has reported unchanged auxin transport in dgt root and shoot, which has led to the hypothesis that DGT regulates auxin perception or signaling but plays no role in PAT (Daniel et al, 1989;Muday et al, 1995). Here, we show that DGT is required for effective auxin transport in planta and in heterologous auxin-transport systems that lack plant-specific components of auxin perception and signaling.…”
Section: Introductionmentioning
confidence: 99%
“…The gravitropic mutant diageotropica of tomato Isolation of mutants displays resistance to auxin, ethylene and auxin transport inhibitors (Muday et al, 1995), and this increased capacity NPA-hypersensitive mutants of A. thaliana were screened on agar medium containing 0.3 µM NPA, which slightly for polar auxin transport in shoots and roots, probably because of alterations in the morphology of these organs inhibits root growth and root gravitropism in wild-type seedlings. Two strains were isolated from ethyl methane- (Daniel et al, 1989;Muday et al, 1995). Another gravitropic mutant, axr4/rgr1 of Arabidopsis thaliana, also exhibits sulfonate (EMS)-mutagenized M 2 seeds.…”
mentioning
confidence: 99%
“…The role of auxins in tomato development has been investigated using the dgt mutant (Daniel et al, 1989). The dgt mutant exhibits horizontal growth habit, thin stems, hyponastic leaves, lack of lateral roots, reduced ethylene production, and insensitivity to auxin (Ursin and Bradford, 1989).…”
mentioning
confidence: 99%
“…The dgt mutant exhibits horizontal growth habit, thin stems, hyponastic leaves, lack of lateral roots, reduced ethylene production, and insensitivity to auxin (Ursin and Bradford, 1989). The inability of auxin to induce growth in the dgt mutant apparently results from a defect in auxin-induced cell-wall loosening (Daniel et al, 1989), since the endogenous levels of IAA are the same in the mutant and wild-type parent (Fujino et al, 1988).…”
mentioning
confidence: 99%