A “Lazy” Mutation in Rice*

Jones, Jenkin W.; Adair, C. Roy

doi:10.1093/oxfordjournals.jhered.a104527

Cited by 38 publications

(23 citation statements)

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“…Some regulators are shared between shoot and root gravitropism, while others are specific to the shoot gravity response (Masson et al, 2002;Morita, 2010;Strohm et al, 2012;Wu et al, 2013). The classical shoot gravitropism mutant phenotype "lazy" has been identified in many plants, including lazy-1 and lazy-2 in tomato (Solanum lycopersicum; Roberts, 1984;Gaiser and Lomax, 1993), lazy in rice (Jones and Adair, 1938), lazy serpentina in barley (Hordeum vulgare; Suge and Türkan, 1991), Two bait constructs expressed full-length ZmLA1 (LA-BD) or truncated ZmLA1 with deletion of residues 1 to 100 (LAΔ100-BD) fused with the DNA-binding domain (BD). PKC or IAA17 fused with the activation domain (AD) served as the prey constructs.…”

Section: Discussion the Function Of Zmla1 Is Partially Conserved In Smentioning

confidence: 99%

Maize LAZY1 Mediates Shoot Gravitropism and Inflorescence Development through Regulating Auxin Transport, Auxin Signaling, and Light Response

et al. 2013

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Section: Discussion the Function Of Zmla1 Is Partially Conserved In Smentioning

confidence: 99%

Maize LAZY1 Mediates Shoot Gravitropism and Inflorescence Development through Regulating Auxin Transport, Auxin Signaling, and Light Response

et al. 2013

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“…Several of the developmental mutants had phenotypes similar to mutants reported in other plant species. For example, a mutant with a downward-growing shoot was similar to agravitrophic mutants lazy in maize and rice and serpentina in barley (Van Overbeek, 1936;Jones and Adair, 1938;Sheridan, 1988;Türkan and Suge, 1991).…”

Section: Discussion Fast Neutron Mutants In Brachypodiummentioning

confidence: 99%

MORE SPIKELETS1Is Required for Spikelet Fate in the Inflorescence of Brachypodium

Derbyshire

Byrne

2013

Plant Physiology

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Grasses produce florets on a structure called a spikelet, and variation in the number and arrangement of both branches and spikelets contributes to the great diversity of grass inflorescence architecture. In Brachypodium (Brachypodium distachyon), the inflorescence is an unbranched spike with a terminal spikelet and a limited number of lateral spikelets. Spikelets are indeterminate and give rise to a variable number of florets. Here, we provide a detailed description of the stages of inflorescence development in Brachypodium. To gain insight into the genetic regulation of Brachypodium inflorescence development, we generated fast neutron mutant populations and screened for phenotypic mutants. Among the mutants identified, the more spikelets1 (mos1) mutant had an increased number of axillary meristems produced from inflorescence meristem compared with the wild type. These axillary meristems developed as branches with production of higher order spikelets. Using a candidate gene approach, mos1 was found to have a genomic rearrangement disrupting the expression of an ethylene response factor class of APETALA2 transcription factor related to the spikelet meristem identity genes branched silkless1 (bd1) in maize (Zea mays) and FRIZZY PANICLE (FZP) in rice (Oryza sativa). We propose MOS1 likely corresponds to the Brachypodium bd1 and FZP ortholog and that the function of this gene in determining spikelet meristem fate is conserved with distantly related grass species. However, MOS1 also appears to be involved in the timing of initiation of the terminal spikelet. As such, MOS1 may regulate the transition to terminal spikelet development in other closely related and agriculturally important species, particularly wheat (Triticum aestivum).Plant shoots develop from the shoot apical meristem, which comprises a central region of pluripotent cells and a peripheral region where cells are recruited to form lateral organs. The shoot apical meristem is established early in embryogenesis and gives rise to all aerial portions of the plant. Following a reproductive transition, the shoot apical meristem converts to an inflorescence meristem, which may produce axillary meristems that form branches and flowers. The production, arrangement, and fate of meristems determine inflorescence architecture.Plant inflorescence architecture is vastly diverse, and one of the most dramatic reflections of this diversity is in the major cereal crop species. In maize (Zea mays), the tassel and ear inflorescence is indeterminate. Axillary meristems produced by the inflorescence in the tassel are initially indeterminate branches. Both the tassel and ear inflorescence, as well as branches of the tassel, produce spikelet pair meristems that then form determinate spikelet meristems, which terminate with production of two flowers or florets (Bortiri and Hake, 2007;Kellogg, 2007). In the rice (Oryza sativa) inflorescence or panicle, branch meristems initially produce secondary branch meristems. Both primary and secondary branches produce lateral spikelet meri...

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“…Although the phenotype of rice la mutant has been described in previous studies [35,40,48], the background of the materials used was not uniform and the analysis was not systematic and comprehensive. We therefore performed an in-depth analysis of the la1-ZF802 mutant.…”

Section: Characterization Of Rice Spreading-grown Mutant La1-zf802mentioning

confidence: 99%

“…Several agravitropic mutants in crops have been reported such as lazy in maize [34], lazy (la) [35] and spk(t) (spreading type of kasalath) [36] in rice, and serpentine in barley [37]. Among them, the rice la mutant has been intensively studied for decades [35,[38][39][40][41][42]. Although enormous efforts have been made in the elucidation of the mechanisms underlying the la phenotype, the studies were mainly concentrated on its phenotypic description and preliminary physiological experiments, and the corresponding gene has not been identified, leading to the poor understanding on molecular mechanisms of shoot gravitropism in crops.…”

Section: Introductionmentioning

confidence: 99%

LAZY1 controls rice shoot gravitropism through regulating polar auxin transport

et al. 2007

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Tiller angle of rice (Oryza sativa L.) is an important agronomic trait that contributes to grain production, and has long attracted attentions of breeders for achieving ideal plant architecture to improve grain yield. Although enormous efforts have been made over the past decades to study mutants with extremely spreading or compact tillers, the molecular mechanism underlying the control of tiller angle of cereal crops remains unknown. Here we report the cloning of the LAZY1 (LA1) gene that regulates shoot gravitropism by which the rice tiller angle is controlled. We show that LA1, a novel grass-specific gene, is temporally and spatially expressed, and plays a negative role in polar auxin transport (PAT). Loss-of-function of LA1 enhances PAT greatly and thus alters the endogenous IAA distribution in shoots, leading to the reduced gravitropism, and therefore the tiller-spreading phenotype of rice plants.

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A “Lazy” Mutation in Rice*

Cited by 38 publications

References 0 publications

Maize LAZY1 Mediates Shoot Gravitropism and Inflorescence Development through Regulating Auxin Transport, Auxin Signaling, and Light Response

Maize LAZY1 Mediates Shoot Gravitropism and Inflorescence Development through Regulating Auxin Transport, Auxin Signaling, and Light Response

MORE SPIKELETS1Is Required for Spikelet Fate in the Inflorescence of Brachypodium

LAZY1 controls rice shoot gravitropism through regulating polar auxin transport

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