The early inflorescence of Arabidopsis thaliana demonstrates positional effects in floral organ growth and meristem patterning

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The early inflorescence of Arabidopsis thaliana demonstrates positional effects in floral organ growth and meristem patterning. / Plackett, Andrew R.G.; Powers, Stephen J.; Phillips, Andy L.; Wilson, Zoe A.; Hedden, Peter; Thomas, Stephen G.

In: Plant Reproduction, Vol. 31, No. 2, 01.06.2018, p. 171-191.

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Plackett, Andrew R.G. ; Powers, Stephen J. ; Phillips, Andy L. ; Wilson, Zoe A. ; Hedden, Peter ; Thomas, Stephen G. / The early inflorescence of Arabidopsis thaliana demonstrates positional effects in floral organ growth and meristem patterning. In: Plant Reproduction. 2018 ; Vol. 31, No. 2. pp. 171-191.

Bibtex

@article{4448addcb2b74e43b0eb785fb577714b,
title = "The early inflorescence of Arabidopsis thaliana demonstrates positional effects in floral organ growth and meristem patterning",
abstract = "Key message: Linear modelling approaches detected significant gradients in organ growth and patterning across early flowers of the Arabidopsis inflorescence and uncovered evidence of new roles for gibberellin in floral development. Abstract: Most flowering plants, including the genetic model Arabidopsis thaliana, produce multiple flowers in sequence from a reproductive shoot apex to form a flower spike (inflorescence). The development of individual flowers on an Arabidopsis inflorescence has typically been considered as highly stereotypical and uniform, but this assumption is contradicted by the existence of mutants with phenotypes visible in early flowers only. This phenomenon is demonstrated by mutants partially impaired in the biosynthesis of the phytohormone gibberellin (GA), in which floral organ growth is retarded in the first flowers to be produced but has recovered spontaneously by the 10th flower. We presently lack systematic data from multiple flowers across the Arabidopsis inflorescence to explain such changes. Using mutants of the GA 20-OXIDASE (GA20ox) GA biosynthesis gene family to manipulate endogenous GA levels, we investigated the dynamics of changing floral organ growth across the early Arabidopsis inflorescence (flowers 1–10). Modelling of floral organ lengths identified a significant, GA-independent gradient of increasing stamen length relative to the pistil in the wild-type inflorescence that was separable from other, GA-dependent effects. It was also found that the first flowers exhibited unstable organ patterning in contrast to later flowers and that this instability was prolonged by exogenous GA treatment. These findings indicate that the development of individual flowers is influenced by hitherto unknown factors acting across the inflorescence and also suggest novel functions for GA in floral patterning.",
keywords = "Arabidopsis, Flower, Gibberellin (GA), Inflorescence, Modelling",
author = "Plackett, {Andrew R.G.} and Powers, {Stephen J.} and Phillips, {Andy L.} and Wilson, {Zoe A.} and Peter Hedden and Thomas, {Stephen G.}",
year = "2018",
month = jun,
day = "1",
doi = "10.1007/s00497-017-0320-3",
language = "English",
volume = "31",
pages = "171--191",
journal = "Plant Reproduction",
issn = "2194-7953",
publisher = "Springer",
number = "2",

}

RIS

TY - JOUR

T1 - The early inflorescence of Arabidopsis thaliana demonstrates positional effects in floral organ growth and meristem patterning

AU - Plackett, Andrew R.G.

AU - Powers, Stephen J.

AU - Phillips, Andy L.

AU - Wilson, Zoe A.

AU - Hedden, Peter

AU - Thomas, Stephen G.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - Key message: Linear modelling approaches detected significant gradients in organ growth and patterning across early flowers of the Arabidopsis inflorescence and uncovered evidence of new roles for gibberellin in floral development. Abstract: Most flowering plants, including the genetic model Arabidopsis thaliana, produce multiple flowers in sequence from a reproductive shoot apex to form a flower spike (inflorescence). The development of individual flowers on an Arabidopsis inflorescence has typically been considered as highly stereotypical and uniform, but this assumption is contradicted by the existence of mutants with phenotypes visible in early flowers only. This phenomenon is demonstrated by mutants partially impaired in the biosynthesis of the phytohormone gibberellin (GA), in which floral organ growth is retarded in the first flowers to be produced but has recovered spontaneously by the 10th flower. We presently lack systematic data from multiple flowers across the Arabidopsis inflorescence to explain such changes. Using mutants of the GA 20-OXIDASE (GA20ox) GA biosynthesis gene family to manipulate endogenous GA levels, we investigated the dynamics of changing floral organ growth across the early Arabidopsis inflorescence (flowers 1–10). Modelling of floral organ lengths identified a significant, GA-independent gradient of increasing stamen length relative to the pistil in the wild-type inflorescence that was separable from other, GA-dependent effects. It was also found that the first flowers exhibited unstable organ patterning in contrast to later flowers and that this instability was prolonged by exogenous GA treatment. These findings indicate that the development of individual flowers is influenced by hitherto unknown factors acting across the inflorescence and also suggest novel functions for GA in floral patterning.

AB - Key message: Linear modelling approaches detected significant gradients in organ growth and patterning across early flowers of the Arabidopsis inflorescence and uncovered evidence of new roles for gibberellin in floral development. Abstract: Most flowering plants, including the genetic model Arabidopsis thaliana, produce multiple flowers in sequence from a reproductive shoot apex to form a flower spike (inflorescence). The development of individual flowers on an Arabidopsis inflorescence has typically been considered as highly stereotypical and uniform, but this assumption is contradicted by the existence of mutants with phenotypes visible in early flowers only. This phenomenon is demonstrated by mutants partially impaired in the biosynthesis of the phytohormone gibberellin (GA), in which floral organ growth is retarded in the first flowers to be produced but has recovered spontaneously by the 10th flower. We presently lack systematic data from multiple flowers across the Arabidopsis inflorescence to explain such changes. Using mutants of the GA 20-OXIDASE (GA20ox) GA biosynthesis gene family to manipulate endogenous GA levels, we investigated the dynamics of changing floral organ growth across the early Arabidopsis inflorescence (flowers 1–10). Modelling of floral organ lengths identified a significant, GA-independent gradient of increasing stamen length relative to the pistil in the wild-type inflorescence that was separable from other, GA-dependent effects. It was also found that the first flowers exhibited unstable organ patterning in contrast to later flowers and that this instability was prolonged by exogenous GA treatment. These findings indicate that the development of individual flowers is influenced by hitherto unknown factors acting across the inflorescence and also suggest novel functions for GA in floral patterning.

KW - Arabidopsis

KW - Flower

KW - Gibberellin (GA)

KW - Inflorescence

KW - Modelling

UR - http://www.scopus.com/inward/record.url?scp=85038621182&partnerID=8YFLogxK

U2 - 10.1007/s00497-017-0320-3

DO - 10.1007/s00497-017-0320-3

M3 - Article

C2 - 29264708

AN - SCOPUS:85038621182

VL - 31

SP - 171

EP - 191

JO - Plant Reproduction

JF - Plant Reproduction

SN - 2194-7953

IS - 2

ER -