Arabidopsis SMAX1 overaccumulation suppresses rosette shoot branching and promotes leaf and petiole elongation

Zheng, Xiujuan; Yang, Xianfeng; Chen, Zheng; Xie, Wenjia; Yue, Xinwu; Hui, Zhu; Chen, Sique; Sun, Xinli

doi:10.1016/j.bbrc.2021.03.006

Cited by 19 publications

(12 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, in Arabidopsis , overaccumulation of SMAX1 could partly complement the increased shoot branching phenotype of max2 , contrasting with the absence of a shoot branching phenotype in smax1 ( Zheng et al, 2021 ), but whether SMAX1 is involved in shoot branching regulation under physiological conditions remains to be seen. Along with the observation that AtSMAX1 is able to complement a smxl45 double mutant, when expressed under the SMXL5 promoter, SMXL proteins from different subclades might possibly operate through a partially conserved mechanism/interaction network ( Wallner et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Masks Start to Drop: Suppressor of MAX2 1-Like Proteins Reveal Their Many Faces

et al. 2022

View full text Add to dashboard Cite

Although the main players of the strigolactone (SL) signaling pathway have been characterized genetically, how they regulate plant development is still poorly understood. Of central importance are the SUPPRESSOR OF MAX2 1-LIKE (SMXL) proteins that belong to a family of eight members in Arabidopsis thaliana, of which one subclade is involved in SL signaling and another one in the pathway of the chemically related karrikins. Through proteasomal degradation of these SMXLs, triggered by either DWARF14 (D14) or KARRIKIN INSENSITIVE2 (KAI2), several physiological processes are controlled, such as, among others, shoot and root architecture, seed germination, and seedling photomorphogenesis. Yet another clade has been shown to be involved in vascular development, independently of the D14 and KAI2 actions and not relying on proteasomal degradation. Despite their role in several aspects of plant development, the exact molecular mechanisms by which SMXLs regulate them are not completely unraveled. To fill the major knowledge gap in understanding D14 and KAI2 signaling, SMXLs are intensively studied, making it challenging to combine all the insights into a coherent characterization of these important proteins. To this end, this review provides an in-depth exploration of the recent data regarding their physiological function, evolution, structure, and molecular mechanism. In addition, we propose a selection of future perspectives, focusing on the apparent localization of SMXLs in subnuclear speckles, as observed in transient expression assays, which we couple to recent advances in the field of biomolecular condensates and liquid–liquid phase separation.

show abstract

Section: Introductionmentioning

confidence: 99%

Masks Start to Drop: Suppressor of MAX2 1-Like Proteins Reveal Their Many Faces

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Oilseed rape ( Brassica napus L ., 2n=38, genome AACC) is a globally important crop that provides vegetable oil for human consumption, biodiesel for industry, oilcake for breeding, and fertilizer for soil ( Wang et al., 2011 ; Zheng et al., 2022 ). Oilseed rape branch architecture such as branch angle (BA)and branch dispersion degree (BD) are key morphological traits that have a significant effect on plant density, collapse resistance, and disease resistance, especially on crop yield ( Wang and Li, 2008 ; Zheng et al., 2021 ). Plants with small branch angles or compact branch architecture are more suitable for mechanized harvest and yield improvement.…”

Section: Introductionmentioning

confidence: 99%

Genetic dissection of branch architecture in oilseed rape (Brassica napus L.) germplasm

Wang

Wang²,

An³

et al. 2022

Front. Plant Sci.

View full text Add to dashboard Cite

Branch architecture is an important factor influencing rapeseed planting density, mechanized harvest, and yield. However, its related genes and regulatory mechanisms remain largely unknown. In this study, branch angle (BA) and branch dispersion degree (BD) were used to evaluate branch architecture. Branch angle exhibited a dynamic change from an increase in the early stage to a gradual decrease until reaching a stable state. Cytological analysis showed that BA variation was mainly due to xylem size differences in the vascular bundle of the branch junction. The phenotypic analysis of 327 natural accessions revealed that BA in six environments ranged from 24.3° to 67.9°, and that BD in three environments varied from 4.20 cm to 21.4 cm, respectively. A total of 115 significant loci were detected through association mapping in three models (MLM, mrMLM, and FarmCPU), which explained 0.53%-19.4% of the phenotypic variations. Of them, 10 loci were repeatedly detected in different environments and models, one of which qBAD.A03-2 was verified as a stable QTL using a secondary segregation population. Totally, 1066 differentially expressed genes (DEGs) were identified between branch adaxial- and abaxial- sides from four extremely large or small BA/BD accessions through RNA sequencing. These DEGs were significantly enriched in the pathways related to auxin biosynthesis and transport as well as cell extension such as indole alkaloid biosynthesis, other glycan degradation, and fatty acid elongation. Four known candidate genes BnaA02g16500D (PIN1), BnaA03g10430D (PIN2), BnaC03g06250D (LAZY1), and BnaC06g20640D (ARF17) were identified by both GWAS and RNA-seq, all of which were involved in regulating the asymmetric distribution of auxins. Our identified association loci and candidate genes provide a theoretical basis for further study of gene cloning and genetic improvement of branch architecture.

show abstract

“…The htl seedling photomorphogenesis phenotype [ 22 ] pointed early on towards the existence of an endogenous ligand (or multiple), which have tentatively been called KAI2 ligand (KL) [ 25 , 26 ], the significance of which was further supported by the discovery of diverse developmental roles for the KAI2 receptor in Arabidopsis, petunia and Lotus japonicus , including the regulation of cotyledon and rosette morphology [ 23 ], rosette shoot branching and leaf and petiole elongation [ 27 ], number of hypodermal passage cells [ 28∗∗ ], root hair density and length [ 29 , 30 ], root skewing [ 31 ], root system architecture [ 29 , 30 , 31 ], and also cuticle development [ 32 ].…”

Section: A Rough Guide To the D14l Signalling Pathwaymentioning

confidence: 99%

Conditioning plants for arbuscular mycorrhizal symbiosis through DWARF14-LIKE signalling

Hull

Choi

Paszkowski

2021

Current Opinion in Plant Biology

View full text Add to dashboard Cite

The evolutionarily ancient α/β hydrolase DWARF14-LIKE (D14L) is indispensable for the perception of beneficial arbuscular mycorrhizal (AM) fungi in the rhizosphere, and for a range of developmental processes. Variants of D14L recognise natural strigolactones and the smoke constituent karrikin, both classified as butenolides, and additional unknown ligand(s), critical for symbiosis and development. Recent advances in the understanding of downstream effects of D14L signalling include biochemical evidence for the degradation of the repressor SMAX1. Indeed, genetic removal of rice SMAX1 leads to the de-repression of symbiosis programmes and to the simultaneous increase in strigolactone production. As strigolactones are key to attraction of the fungus in the rhizosphere, the D14L signalling pathway appears to coordinate fungal stimulation and root symbiotic competency. Here, we discuss the possible integrative roles of D14L signalling in conditioning plants for AM symbiosis.

show abstract

Arabidopsis SMAX1 overaccumulation suppresses rosette shoot branching and promotes leaf and petiole elongation

Cited by 19 publications

References 30 publications

Masks Start to Drop: Suppressor of MAX2 1-Like Proteins Reveal Their Many Faces

Masks Start to Drop: Suppressor of MAX2 1-Like Proteins Reveal Their Many Faces

Genetic dissection of branch architecture in oilseed rape (Brassica napus L.) germplasm

Conditioning plants for arbuscular mycorrhizal symbiosis through DWARF14-LIKE signalling

Contact Info

Product

Resources

About