Recent advances in gibberellin biosynthesis

Hedden, Peter

doi:10.1093/jxb/50.334.553

Cited by 25 publications

(32 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the tags was homologous to genes coding for different GA20ox. The deduced amino acid sequence of the fulllength cDNA clone SrGA20ox1 was approximately 50% identical to GA20ox sequences from other species, in agreement with the commonly observed degree of amino acid sequence identity of 50% to 60% between GA20ox of unrelated species (Hedden, 1999). The identity of the protein was confirmed by an in vitro assay.…”

Section: Srga20ox1 Codes For An Active Ga20ox and Is Induced Upon Advsupporting

confidence: 82%

See 1 more Smart Citation

Gibberellins Are Involved in Nodulation of Sesbania rostrata

et al. 2005

View full text Add to dashboard Cite

Upon submergence, Azorhizobium caulinodans infects the semiaquatic legume Sesbania rostrata via the intercellular crack entry process, resulting in lateral root-based nodules. A gene encoding a gibberellin (GA) 20-oxidase, SrGA20ox1, involved in GA biosynthesis, was transiently up-regulated during lateral root base nodulation. Two SrGA20ox1 expression patterns were identified, one related to intercellular infection and a second observed in nodule meristem descendants. The infection-related expression pattern depended on bacterially produced nodulation (Nod) factors. Pharmacological studies demonstrated that GAs were involved in infection pocket and infection thread formation, two Nod factor-dependent events that initiate lateral root base nodulation, and that they were also needed for nodule primordium development. Moreover, GAs inhibited the root hair curling process. These results show that GAs are Nod factor downstream signals for nodulation in hydroponic growth.Legume plants develop a symbiotic interaction with rhizobia by forming root nodules in which the bacteria fix atmospheric nitrogen. Nodule formation integrates several developmental processes, such as induction of cortical and pericycle cell division and rhizobial invasion, which are coordinated in time and space. The onset of the symbiosis is marked by a complex exchange of signals, involving plant flavonoids and bacterial nodulation (Nod) factors. Recognition of specific Nod factors will switch on the nodulation program in the legume host.The best known mode of invasion is the root hair curling (RHC) mechanism that is used by most crop legumes and the model legumes barrel medic (Medicago truncatula) and Lotus japonicus. Rhizobia induce growing root hairs to curl in the root zone I, just above the root meristem, whereby a rhizobial microcolony is entrapped. Local cell wall degradation and subsequent inward growth of the root hair plasma membrane result in the formation of an infection thread (IT) that guides the bacteria to the cortical cells. RHC is Nod factor dependent, and purified compatible Nod factors trigger several nodulation-related effects within the root hair, such as deformation, gene expression, Ca 21 spiking, membrane depolarization, and ion effluxes (Oldroyd and Downie, 2004). Several compo-

show abstract

Section: Srga20ox1 Codes For An Active Ga20ox and Is Induced Upon Advsupporting

confidence: 82%

“…After GA20ox-mediated synthesis of C 19 -GAs, they are converted into bioactive GAs by the action of GA3ox (Hedden, 1999). Considerable evidence indicates that the stages catalyzed by GA20ox are important regulatory checkpoints.…”

Section: Two Distinct Patterns Of Srga20ox1 Expression During Lrb Nodmentioning

confidence: 99%

Gibberellins Are Involved in Nodulation of Sesbania rostrata

et al. 2005

View full text Add to dashboard Cite

show abstract

“…Phinney, and Margaret Radley (Moore, 1989); since then over 121 GAs have been isolated from plants and fungi (Hedden, 1999). Numerous reviews on the various aspects of GAs have been published, including a comprehensive review by Hedden and Kamiya (1 997) on the enzymes and genes involved in GAbiosynthesis and their regulation, which has since been updated by Hedden…”

Section: Gibberellinsmentioning

confidence: 99%

Relationship between gibberellins, height, and stress tolerance in barley (Hordeum vulgare L.) seedlings

Sarkar¹,

Perras²,

Falk

et al. 2004

Plant Growth Regulation

View full text Add to dashboard Cite

“…Bioactive gibberellins are important natural regulators of growth and development throughout the life cycle of higher plants, including seed germination, stem elongation and flowering (Hedden 1999). The gibberellin metabolic pathway has been elucidated and the majority of the genes encoding the enzymes have been cloned and characterized (reviewed in Hedden and Phillips 2000a).…”

Section: Introductionmentioning

confidence: 99%

Efecto de la sobreexpresión y del silenciamiento de genes del metabolismo de giberelinas sobre el desarrollo de tabaco

Giraldo¹,

Marcela²

View full text Add to dashboard Cite

AGRADECIMIENTOSEste trabajo ha sido realizado gracias a una beca del Ministerio de Educación y Ciencia de España dentro del programa de becas de formación de personal investigador F.P.I.Quiero agradecer enérgicamente a todas las personas del Instituto de Biología Molecular y Celular de Plantas IBMCP, que han dedicado parte de su tiempo y de su conocimiento en enseñarme de que iba todo esto, pues gracias a ese cúmulo de información he podido realizar esta tesis doctoral. También quiero agradecer a las personas del instituto que desinteresadamente me han ofrecido una sonrisa y han compartido con migo su día a día.Gracias infinitas a mi familia, a mi hija Issabella por su paciencia y su compañía, al Dr. Juan Carlos Serrani, por su ayuda impecable prestada hasta último momento en este trabajo y a mi madre, a mi abuela y a mi hermana por no abandonarme nunca de pensamiento.

show abstract

Recent advances in gibberellin biosynthesis

Abstract: Recent advances in gibberellin biosynthesis 561 skeleton is not of mevalonate origin. Proceedings of the multi-gene families for a number of the genes, with

Cited by 25 publications

References 62 publications

Gibberellins Are Involved in Nodulation of Sesbania rostrata

Gibberellins Are Involved in Nodulation of Sesbania rostrata

Relationship between gibberellins, height, and stress tolerance in barley (Hordeum vulgare L.) seedlings

Efecto de la sobreexpresión y del silenciamiento de genes del metabolismo de giberelinas sobre el desarrollo de tabaco

Contact Info

Product

Resources

About