<i>RETARDED PALEA1</i> Controls Palea Development and Floral Zygomorphy in Rice

Gao, Shan; Xue, Dawei; Luo, Da; Li, Lantian; Ding, Sheng; Yao, Xuan; Wilson, Zoe A.; Qian, Qian; Zhang, Dabing

doi:10.1104/pp.108.128231

Cited by 158 publications

(167 citation statements)

References 49 publications

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“…The rep1 mutant displays retarded palea development with five vascular bundles at least partially affecting the floral bilateral asymmetric morphology. This finding therefore extends the function of the TCP gene family members in defining the diversification of floral morphology in grasses, and suggests that a common conserved mechanism controlling floral zygomorphy by CYC-like genes exists in both eudicots and monocots [32]. In addition, the palealess mutant (pal) with two leafy structures instead of the palea has been identified [49], suggesting that PAL1 is another key regulator of palea development in rice.…”

Section: Osmads6 Plays An Important Role In Specifying Rice Palea Idementioning

confidence: 79%

“…We have recently shown that the CY-CLOIDEA (CYC)-like factor, RETARDED PALEA1 (REP1), is able to regulate palea identity and floral asymmetry in rice [32]. The REP1 gene is only expressed in palea primordium during early flower development [32].…”

Section: Osmads6 Plays An Important Role In Specifying Rice Palea Idementioning

confidence: 99%

“…Along the axis of the lemma to palea (Le/Pa), the wild type floral organs display bilateral symmetry, and the lemma and palea form an interlocked structure by their distinctive marginal tissues ( Figure 3A) [31]. Although the lemma and palea develop a very similar histological structure comprised of silicified cells, fibrous sclerenchyma, spongy parenchymatous cells and nonsilicified cells [32], the lemma is slightly larger than the palea with characteristic vascular tissue patterns: the lemma has five vascular bundles, whereas three are observed in the palea ( Figure 3A and 3C) [31]. In addition, the palea has a distinctive marginal tissue displaying unique smooth epidermis, which lacks epicuticular silicified thickening [31] (Figure 3A and 3C).…”

Section: Osmads6 Mutants Display Altered Identities Of Floral Organsmentioning

confidence: 99%

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The AGL6-like gene OsMADS6 regulates floral organ and meristem identities in rice

et al. 2009

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Although AGAMOUS-LIKE6 (AGL6) MADS-box genes are ancient with wide distributions in gymnosperms and angiosperms, their functions remain poorly understood. Here, we show the biological role of the AGL6-like gene, OsMADS6, in specifying floral organ and meristem identities in rice (Oryza sativa L.). OsMADS6 was strongly expressed in the floral meristem at early stages. Subsequently, OsMADS6 transcripts were mainly detectable in paleas, lodicules, carpels and the integument of ovule, as well as in the receptacle. Compared to wild type plants, osmads6 mutants displayed altered palea identity, extra glume-like or mosaic organs, abnormal carpel development and loss of floral meristem determinacy. Strikingly, mutation of a SEPALLATA (SEP)-like gene, OsMADS1 (LHS1), enhanced the defect of osmads6 flowers, and no inner floral organs or glume-like structures were observed in whorls 2 and 3 of osmads1-z osmads6-1 flowers. Furthermore, the osmads1-z osmads6-1 double mutants developed severely indeterminate floral meristems. Our finding, therefore, suggests that the ancient OsMADS6 gene is able to specify "floral state" by determining floral organ and meristem identities in monocot crop rice together with OsMADS1.

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Section: Osmads6 Plays An Important Role In Specifying Rice Palea Idementioning

confidence: 79%

Section: Osmads6 Plays An Important Role In Specifying Rice Palea Idementioning

confidence: 99%

Section: Osmads6 Mutants Display Altered Identities Of Floral Organsmentioning

confidence: 99%

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The AGL6-like gene OsMADS6 regulates floral organ and meristem identities in rice

et al. 2009

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“…To obtain the full-length cDNA of PTC1, RACE-PCR was performed with the GeneRacer kit (Invitrogen) as described before (Yuan et al, 2009). The PTC1 cDNA was amplified using 2 mL of RACE product from rice anther RNAs (stage 9) with Phusion hot-start high-fidelity polymerase (New England Biolabs).…”

Section: Isolation Of Ptc1 Full-length Cdnamentioning

confidence: 99%

PERSISTENT TAPETAL CELL1Encodes a PHD-Finger Protein That Is Required for Tapetal Cell Death and Pollen Development in Rice

et al. 2011

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In higher plants, timely degradation of tapetal cells, the innermost sporophytic cells of the anther wall layer, is a prerequisite for the development of viable pollen grains. However, relatively little is known about the mechanism underlying programmed tapetal cell development and degradation. Here, we report a key regulator in monocot rice (Oryza sativa), PERSISTANT TAPETAL CELL1 (PTC1), which controls programmed tapetal development and functional pollen formation. The evolutionary significance of PTC1 was revealed by partial genetic complementation of the homologous mutation MALE STERILITY1 (MS1) in the dicot Arabidopsis (Arabidopsis thaliana). PTC1 encodes a PHD-finger (for plant homeodomain) protein, which is expressed specifically in tapetal cells and microspores during anther development in stages 8 and 9, when the wild-type tapetal cells initiate a typical apoptosis-like cell death. Even though ptc1 mutants show phenotypic similarity to ms1 in a lack of tapetal DNA fragmentation, delayed tapetal degeneration, as well as abnormal pollen wall formation and aborted microspore development, the ptc1 mutant displays a previously unreported phenotype of uncontrolled tapetal proliferation and subsequent commencement of necrosis-like tapetal death. Microarray analysis indicated that 2,417 tapetum-and microspore-expressed genes, which are principally associated with tapetal development, degeneration, and pollen wall formation, had changed expression in ptc1 anthers. Moreover, the regulatory role of PTC1 in anther development was revealed by comparison with MS1 and other rice anther developmental regulators. These findings suggest a diversified and conserved switch of PTC1/MS1 in regulating programmed male reproductive development in both dicots and monocots, which provides new insights in plant anther development.

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“…However, the CYCLO-IDEA (CYC)-like homolog RETARDED PALEA1 (REP1) in rice is a palea-specific gene that plays essential roles in palea initiation by regulating cell proliferation and expansion but does not affect lemma development (Yuan et al, 2009). In the rep1 mutant, palea development is delayed and the palea morphology is also altered.…”

Section: Agl6-like Genes Are Markers For the Palea In Grassesmentioning

confidence: 99%

Evolution ofAGL6-likeMADS Box Genes in Grasses (Poaceae): Ovule Expression Is Ancient and Palea Expression Is New

Reinheimer

Kellogg

2009

The Plant Cell

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AGAMOUS-like6 (AGL6) genes encode MIKC-type MADS box transcription factors and are closely related to SEPALLATA and AP1/FUL-like genes. Here, we focus on the molecular evolution and expression of the AGL6-like genes in grasses. We have found that AGL6-like genes are expressed in ovules, lodicules (second whorl floral organs), paleas (putative first whorl floral organs), and floral meristems. Each of these expression domains was acquired at a different time in evolution, indicating that each represents a distinct function of the gene product and that the AGL6-like genes are pleiotropic. Expression in the inner integument of the ovule appears to be an ancient expression pattern corresponding to the expression of the gene in the megasporangium and integument in gymnosperms. Expression in floral meristems appears to have been acquired in the angiosperms and expression in second whorl organs in monocots. Early in grass evolution, AGL6-like orthologs acquired a new expression domain in the palea. Stamen expression is variable. Most grasses have a single AGL6-like gene (orthologous to the rice [Oryza sativa] gene MADS6). However, rice and other species of Oryza have a second copy (orthologous to rice MADS17) that appears to be the result of an ancient duplication.

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RETARDED PALEA1 Controls Palea Development and Floral Zygomorphy in Rice

Cited by 158 publications

References 49 publications

The AGL6-like gene OsMADS6 regulates floral organ and meristem identities in rice

The AGL6-like gene OsMADS6 regulates floral organ and meristem identities in rice

PERSISTENT TAPETAL CELL1Encodes a PHD-Finger Protein That Is Required for Tapetal Cell Death and Pollen Development in Rice

Evolution ofAGL6-likeMADS Box Genes in Grasses (Poaceae): Ovule Expression Is Ancient and Palea Expression Is New

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