Mutations in the huge Arabidopsis gene BIG affect a range of hormone and light responses

K Kanyuka, U Praekelt, K A Franklin, O E Billingham, R Hooley, G C Whitelam, K J Halliday

Research output: Contribution to journalArticle

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Abstract

In independent genetic screens, for shade-avoidance response and cytokinin sensitivity, we identified two Arabidopsis mutants, attenuated shade avoidance 1 (asa1 ) and umbrella1 (umb1 ), which have very similar pleiotropic phenotypes. asa1 and umb1 are allelic to tir3-1 , and are caused by mutations in BIG , which is required for normal auxin efflux. They have a compact rosette, fewer lateral roots, delayed flowering, more secondary inflorescence, smaller seeds and, in the Laer -0 background, much shorter internodes between adjacent flowers, suggesting an interaction between BIG and ERECTA . These mutants have organ-specific defects in response to cytokinins, ethylene, N -1-naphthylphthalamic acid (NPA) and gibberellin (GA). The phenotype of the asa1 ga1-3 double mutant is consistent with defects in GA signalling. There are subtle effects in responses to auxins, abscisic acid and brassinolide. Elongation growth associated with shade avoidance in phyA phyB null mutants is suppressed by asa1 in all organs other than the hypocotyl. Therefore, we here provide evidence that BIG is a key player not just in auxin signalling, but in a multitude of light and hormone pathways.
Original languageEnglish
Pages (from-to)57-70
Number of pages14
JournalThe Plant Journal
Volume35
Issue number1
DOIs
Publication statusPublished - 2003

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Indoleacetic Acids
Arabidopsis
Cytokinins
shade
hormones
Hormones
mutation
Light
Mutation
Genes
Phenotype
Gibberellins
Hypocotyl
auxins
Inflorescence
mutants
Abscisic Acid
genes
cytokinins
Seeds

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Kanyuka, K., Praekelt, U., Franklin, K. A., Billingham, O. E., Hooley, R., Whitelam, G. C., & Halliday, K. J. (2003). Mutations in the huge Arabidopsis gene BIG affect a range of hormone and light responses. The Plant Journal, 35(1), 57-70. https://doi.org/10.1046/j.1365-313X.2003.01779.x

Mutations in the huge Arabidopsis gene BIG affect a range of hormone and light responses. / Kanyuka, K; Praekelt, U; Franklin, K A; Billingham, O E; Hooley, R; Whitelam, G C; Halliday, K J.

In: The Plant Journal, Vol. 35, No. 1, 2003, p. 57-70.

Research output: Contribution to journalArticle

Kanyuka, K, Praekelt, U, Franklin, KA, Billingham, OE, Hooley, R, Whitelam, GC & Halliday, KJ 2003, 'Mutations in the huge Arabidopsis gene BIG affect a range of hormone and light responses', The Plant Journal, vol. 35, no. 1, pp. 57-70. https://doi.org/10.1046/j.1365-313X.2003.01779.x
Kanyuka K, Praekelt U, Franklin KA, Billingham OE, Hooley R, Whitelam GC et al. Mutations in the huge Arabidopsis gene BIG affect a range of hormone and light responses. The Plant Journal. 2003;35(1):57-70. https://doi.org/10.1046/j.1365-313X.2003.01779.x
Kanyuka, K ; Praekelt, U ; Franklin, K A ; Billingham, O E ; Hooley, R ; Whitelam, G C ; Halliday, K J. / Mutations in the huge Arabidopsis gene BIG affect a range of hormone and light responses. In: The Plant Journal. 2003 ; Vol. 35, No. 1. pp. 57-70.
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