Regulation of meristem maintenance and organ identity during rice reproductive development

Chongloi, Grace Lhaineikim; Prakash, Sandhan; Vijayraghavan, Usha

doi:10.1093/jxb/erz046

Cited by 24 publications

(27 citation statements)

References 187 publications

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“…In the grasses, a plethora of distinct inflorescence architectures are found and recent investigations in rice, maize, wheat, barley, and brachypodium are unraveling the genetic basis of each (Bommert and Whipple 2018;Chongloi et al 2019;Gauley and Boden 2019;Koppolu and Schnurbusch 2019). In the compound inflorescence of rice, flowers are borne on branches, with early arising branches forming secondary branches.…”

Section: Axillary Meristems That Give Rise To Branches or Flowersmentioning

confidence: 99%

“…Both primary and secondary branches then form spikelet meristems and also terminate in a spikelet meristem. Each spikelet meristem gives rise to a single-flower meristem and flower (Bommert and Whipple 2018;Chongloi et al 2019). Maize has both male (tassel) and female (ear) inflorescences.…”

Section: Axillary Meristems That Give Rise To Branches or Flowersmentioning

confidence: 99%

“…Recently, it was shown that FZP down-regulates APO2/LFY in spikelet meristems (Bai et al 2016). PANICLE PHYTOMER2 (PAP2/Os-MADS34), a member of a grass-specific clade of SEP proteins, promotes spikelet meristem identity (for review, see Chongloi et al 2019). Spikelet meristem determinacy, prevention of formation of multiple florets, is under control of microRNA miR172 and its AP2 transcription factor targets INDETERMINATE SPIKELET1 (IDS1) and SISTER OF IDS1 (SID) (Chuck et al 2007(Chuck et al , 2008.…”

Section: Axillary Meristems That Give Rise To Branches or Flowersmentioning

confidence: 99%

“…RA3 acts downstream of RA1 and RA2 and encodes a trehalose 6 phosphate phosphatase (Satoh-Nagasawa et al 2006; for review, see Bommert and Whipple 2018). RA1 is only found in the Andropogonae (Bommert and Whipple 2018;Chongloi et al 2019). RA1 physically and genetically interacts with a transcriptional corepressor RA-MOSA1 ENHANCER LOCUS2 (REL) of the TOPLESS family, which-as its Arabidopsis counterparts-interacts with many transcription factors (Liu et al 2019b).…”

Section: Plant Inflorescence Architecturementioning

confidence: 99%

“…The inflorescences of tomato are determinate and compound; while maize and rice have determinate or indeterminate compound inflorescences, respectively (Benlloch et al 2015;Bommert and Whipple 2018). Recent advances in our understanding of the molecular-genetic regulation of plant architecture are mostly from these and other model and crop plants (Benlloch et al 2007;Zhang and Yuan 2014;Teichmann and Muhr 2015;Bommert and Whipple 2018;Chongloi et al 2019) and have begun to shed light on how individual aspects of plant architecture initiate, develop, and are maintained. This review will focus on these advances and the underlying genetic determinants.…”

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confidence: 99%

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Plant Inflorescence Architecture: The Formation, Activity, and Fate of Axillary Meristems

Zhu

Wagner

2019

Cold Spring Harb Perspect Biol

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The above-ground plant body in different plant species can have very distinct forms or architectures that arise by recurrent redeployment of a finite set of building blocks-leaves with axillary meristems, stems or branches, and flowers. The unique architectures of plant inflorescences in different plant families and species, on which this review focuses, determine the reproductive success and yield of wild and cultivated plants. Major contributors to the inflorescence architecture are the activity and developmental trajectories adopted by axillary meristems, which determine the degree of branching and the number of flowers formed. Recent advances in genetic and molecular analyses in diverse flowering plants have uncovered both common regulatory principles and unique players and/or regulatory interactions that underlie inflorescence architecture. Modulating activity of these regulators has already led to yield increases in the field. Additional insight into the underlying regulatory interactions and principles will not only uncover how their rewiring resulted in altered plant form, but will also enhance efforts at optimizing plant architecture in desirable ways in crop species.

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Section: Axillary Meristems That Give Rise To Branches or Flowersmentioning

confidence: 99%

Section: Axillary Meristems That Give Rise To Branches or Flowersmentioning

confidence: 99%

Section: Axillary Meristems That Give Rise To Branches or Flowersmentioning

confidence: 99%

Section: Plant Inflorescence Architecturementioning

confidence: 99%

mentioning

confidence: 99%

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Plant Inflorescence Architecture: The Formation, Activity, and Fate of Axillary Meristems

Zhu

Wagner

2019

Cold Spring Harb Perspect Biol

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OsJAZ11 regulates spikelet and seed development in rice

et al. 2022

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Seed size is one of the major determinants of seed weight and eventually, crop yield. As the global population is increasing beyond the capacity of current food production, enhancing seed size is a key target for crop breeders. Despite the identification of several genes and QTLs, current understanding about the molecular regulation of seed size/weight remains fragmentary. In the present study, we report novel role of a jasmonic acid (JA) signaling repressor, OsJAZ11 controlling rice seed width and weight. Transgenic rice lines overexpressing OsJAZ11 exhibited up to a 14% increase in seed width and ~30% increase in seed weight compared to wild type (WT). Constitutive expression of OsJAZ11 dramatically influenced spikelet morphogenesis leading to extra glume‐like structures, open hull, and abnormal numbers of floral organs. Furthermore, overexpression lines accumulated higher JA levels in spikelets and developing seeds. Expression studies uncovered altered expression of JA biosynthesis/signaling and MADS box genes in overexpression lines compared to WT. Yeast two‐hybrid and pull‐down assays revealed that OsJAZ11 interacts with OsMADS29 and OsMADS68. Remarkably, expression of OsGW7 , a key negative regulator of grain size, was significantly reduced in overexpression lines. We propose that OsJAZ11 participates in the regulation of seed size and spikelet development by coordinating the expression of JA‐related, OsGW7 and MADS genes.

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Differential gene expression during floral transition in pineapple

Paull,

Ksouri,

Kantar

et al. 2023

Plant Direct

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Pineapple (Ananas comosus var. comosus) and ornamental bromeliads are commercially induced to flower by treatment with ethylene or its analogs. The apex is transformed from a vegetative to a floral meristem and shows morphological changes in 8 to 10 days, with flowers developing 8 to 10 weeks later. During eight sampling stages ranging from 6 h to 8 days after treatment, 7961 genes were found to exhibit differential expression (DE) after the application of ethylene. In the first 3 days after treatment, there was little change in ethylene synthesis or in the early stages of the ethylene response. Subsequently, three ethylene response transcription factors (ERTF) were up‐regulated and the potential gene targets were predicted to be the positive flowering regulator CONSTANS‐like 3 (CO), a WUSCHEL gene, two APETALA1/FRUITFULL (AP1/FUL) genes, an epidermal patterning gene, and a jasmonic acid synthesis gene. We confirm that pineapple has lost the flowering repressor FLOWERING LOCUS C. At the initial stages, the SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1) was not significantly involved in this transition. Another WUSCHEL gene and a PHD homeobox transcription factor, though not apparent direct targets of ERTF, were up‐regulated within a day of treatment, their predicted targets being the up‐regulated CO, auxin response factors, SQUAMOSA, and histone H3 genes with suppression of abscisic acid response genes. The FLOWERING LOCUS T (FT), TERMINAL FLOWER (TFL), AGAMOUS‐like APETELAR (AP2), and SEPETALA (SEP) increased rapidly within 2 to 3 days after ethylene treatment. Two FT genes were up‐regulated at the apex and not at the leaf bases after treatment, suggesting that transport did not occur. These results indicated that the ethylene response in pineapple and possibly most bromeliads act directly to promote the vegetative to flower transition via APETALA1/FRUITFULL (AP1/FUL) and its interaction with SPL, FT, TFL, SEP, and AP2. A model based on AP2/ERTF DE and predicted DE target genes was developed to give focus to future research. The identified candidate genes are potential targets for genetic manipulation to determine their molecular role in flower transition.

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Regulation of meristem maintenance and organ identity during rice reproductive development

Cited by 24 publications

References 187 publications

Plant Inflorescence Architecture: The Formation, Activity, and Fate of Axillary Meristems

Plant Inflorescence Architecture: The Formation, Activity, and Fate of Axillary Meristems

OsJAZ11 regulates spikelet and seed development in rice

Differential gene expression during floral transition in pineapple

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