scholarly journals Positive Autoregulation of a KNOX Gene Is Essential for Shoot Apical Meristem Maintenance in Rice

2011 ◽  
Vol 23 (12) ◽  
pp. 4368-4381 ◽  
Author(s):  
Katsutoshi Tsuda ◽  
Yukihiro Ito ◽  
Yutaka Sato ◽  
Nori Kurata
Keyword(s):  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Knox Gene ◽  
Meristem Maintenance

scholarly journals ASYMMETRIC LEAVES1 reveals knox gene redundancy in Arabidopsis

Development ◽  
2002 ◽  
Vol 129 (8) ◽  
pp. 1957-1965 ◽  
Author(s):  
Mary E. Byrne ◽  
Joseph Simorowski ◽  
Robert A. Martienssen
Keyword(s):  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Cell Function ◽  
The Novel ◽  
Knox Gene ◽  
Knox Genes ◽  
Lateral Organs ◽  
Gene Redundancy ◽  
Lateral Organ ◽  
Meristem Maintenance

The shoot apical meristem comprises undifferentiated stem cells and their derivatives, which include founder cells for lateral organs such as leaves. Meristem maintenance and lateral organ specification are regulated in part by negative interactions between the myb domain transcription factor ASYMMETRIC LEAVES1, which is expressed in lateral organ primordia, and homeobox transcription factors which are expressed in the shoot apical meristem (knox genes). The knox gene SHOOT MERISTEMLESS (STM) negatively regulates ASYMMETRIC LEAVES1 (AS1) which, in turn, negatively regulates other knox genes including KNAT1 and KNAT2, and positively regulates the novel gene LATERAL ORGAN BOUNDARIES (LOB). Genetic interactions with a second gene, ASYMMETRIC LEAVES2 (AS2), indicate it acts at the same position in this hierarchy as AS1. We have used a second-site suppressor screen to isolate mutations in KNAT1 and we show that KNAT1 is partially redundant with STM in regulating stem cell function. Mutations in KNAT2 show no such interaction. We discuss the regulation and evolution of redundancy among knox genes.

scholarly journals Spatiotemporal Sequestration of miR165/166 by Arabidopsis Argonaute10 Promotes Shoot Apical Meristem Maintenance

Cell Reports ◽  
2015 ◽  
Vol 10 (11) ◽  
pp. 1819-1827 ◽  
Author(s):  
Yuyi Zhou ◽  
Minami Honda ◽  
Hongliang Zhu ◽  
Zhonghui Zhang ◽  
Xinwei Guo ◽  
...  
Keyword(s):  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Meristem Maintenance

scholarly journals Control of Rice Embryo Development, Shoot Apical Meristem Maintenance, and Grain Yield by a Novel Cytochrome P450

2013 ◽  
Vol 6 (6) ◽  
pp. 1945-1960 ◽  
Author(s):  
Weibing Yang ◽  
Mingjun Gao ◽  
Xin Yin ◽  
Jiyun Liu ◽  
Yonghan Xu ◽  
...  
Keyword(s):  
Cytochrome P450 ◽  
Grain Yield ◽  
Embryo Development ◽  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Meristem Maintenance ◽  
Rice Embryo

scholarly journals L1 Division and Differentiation Patterns Influence Shoot Apical Meristem Maintenance

2006 ◽  
Vol 141 (4) ◽  
pp. 1349-1362 ◽  
Author(s):  
Sharon Kessler ◽  
Brad Townsley ◽  
Neelima Sinha
Keyword(s):  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Meristem Maintenance

scholarly journals FAR-RED ELONGATED HYPOCOTYL3 activates SEPALLATA2 but inhibits CLAVATA3 to regulate meristem determinacy and maintenance in Arabidopsis

2016 ◽  
Vol 113 (33) ◽  
pp. 9375-9380 ◽  
Author(s):  
Dongming Li ◽  
Xing Fu ◽  
Lin Guo ◽  
Zhigang Huang ◽  
Yongpeng Li ◽  
...  
Keyword(s):  
Flower Development ◽  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Target Genes ◽  
Developmental Stages ◽  
Binding Motif ◽  
Phytochrome B ◽  
Helix Loop Helix ◽  
Before And After ◽  
Meristem Maintenance

Plant meristems are responsible for the generation of all plant tissues and organs. Here we show that the transcription factor (TF) FAR-RED ELONGATED HYPOCOTYL3 (FHY3) plays an important role in both floral meristem (FM) determinacy and shoot apical meristem maintenance in Arabidopsis, in addition to its well-known multifaceted roles in plant growth and development during the vegetative stage. Through genetic analyses, we show that WUSCHEL (WUS) and CLAVATA3 (CLV3), two central players in the establishment and maintenance of meristems, are epistatic to FHY3. Using genome-wide ChIP-seq and RNA-seq data, we identify hundreds of FHY3 target genes in flowers and find that FHY3 mainly acts as a transcriptional repressor in flower development, in contrast to its transcriptional activator role in seedlings. Binding motif-enrichment analyses indicate that FHY3 may coregulate flower development with three flower-specific MADS-domain TFs and four basic helix–loop–helix TFs that are involved in photomorphogenesis. We further demonstrate that CLV3, SEPALLATA1 (SEP1), and SEP2 are FHY3 target genes. In shoot apical meristem, FHY3 directly represses CLV3, which consequently regulates WUS to maintain the stem cell pool. Intriguingly, CLV3 expression did not change significantly in fhy3 and phytochrome B mutants before and after light treatment, indicating that FHY3 and phytochrome B are involved in light-regulated meristem activity. In FM, FHY3 directly represses CLV3, but activates SEP2, to ultimately promote FM determinacy. Taken together, our results reveal insights into the mechanisms of meristem maintenance and determinacy, and illustrate how the roles of a single TF may vary in different organs and developmental stages.

scholarly journals Grass Meristems I: Shoot Apical Meristem Maintenance, Axillary Meristem Determinacy and the Floral Transition

2013 ◽  
Vol 54 (3) ◽  
pp. 302-312 ◽  
Author(s):  
Michael Pautler ◽  
Wakana Tanaka ◽  
Hiro-Yuki Hirano ◽  
David Jackson
Keyword(s):  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Floral Transition ◽  
Axillary Meristem ◽  
Meristem Maintenance

Flower meristem maintenance by TILLERS ABSENT 1 is essential for ovule development in rice

Development ◽  
2021 ◽  
Vol 148 (24) ◽  
Author(s):  
Wakana Tanaka ◽  
Suzuha Ohmori ◽  
Naoto Kawakami ◽  
Hiro-Yuki Hirano
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Flower Development ◽  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Stem Cell Marker ◽  
Ovule Development ◽  
Flower Meristem ◽  
Ovule Formation ◽  
Meristem Maintenance

ABSTRACT Plant development depends on the activity of pluripotent stem cells in meristems, such as the shoot apical meristem and the flower meristem. In Arabidopsis thaliana, WUSCHEL (WUS) is essential for stem cell homeostasis in meristems and integument differentiation in ovule development. In rice (Oryza sativa), the WUS ortholog TILLERS ABSENT 1 (TAB1) promotes stem cell fate in axillary meristem development, but its function is unrelated to shoot apical meristem maintenance in vegetative development. In this study, we examined the role of TAB1 in flower development. The ovule, which originates directly from the flower meristem, failed to differentiate in tab1 mutants, suggesting that TAB1 is required for ovule formation. Expression of a stem cell marker was completely absent in the flower meristem at the ovule initiation stage, indicating that TAB1 is essential for stem cell maintenance in the ‘final’ flower meristem. The ovule defect in tab1 was partially rescued by floral organ number 2 mutation, which causes overproliferation of stem cells. Collectively, it is likely that TAB1 promotes ovule formation by maintaining stem cells at a later stage of flower development.

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