Ectopic expression of OsMADS1 caused dwarfism and spikelet alteration in rice

Wang, Sheng; Zeng, Xin; Zhang, Hui; Shen, Yanjiao; Chen, Huan; Wang, Zhongwei; Long, Jue-Chen; Ling, Yinghua; He, Guanghua; Li, Yunfeng

doi:10.1007/s10725-016-0220-9

Cited by 31 publications

(30 citation statements)

References 36 publications

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“…Class E genes are required for floral determinacy, including the five SEPALLATA -like genes OsMADS1 , OsMADS5 , OsMADS7 , OsMADS8 , and OsMADS34 . Ectopic expression of OsMADS1 was reported to cause reduced branches and small panicles ( Wang et al , 2017 ). Thus the delay of accumulation of RNA expression of FZP and SEPALLATA -like genes indicates the delay of acquiring spikelet meristem identity.…”

Section: Discussionmentioning

confidence: 99%

OsMFT1 increases spikelets per panicle and delays heading date in rice by suppressing Ehd1, FZP and SEPALLATA-like genes

Song

Wang

et al. 2018

Journal of Experimental Botany

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Section: Discussionmentioning

confidence: 99%

OsMFT1 increases spikelets per panicle and delays heading date in rice by suppressing Ehd1, FZP and SEPALLATA-like genes

Song

Wang

et al. 2018

Journal of Experimental Botany

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“… 33 reported that a near isogenic line of rice carrying chromosome segment of OsSPS1 of indica rice Kasalath in the genetic background of Koshihikari produces greater number of spikelets per panicle; OsSPS1 encoding sucrose synthase activity of leaf could promote greater distribution of assimilates to panicle and increase spikelet number. Ectopic expression of an E-class gene of rice OsMADS1 , specifying identities of lemma and palea, induced abnormal brassinosteroid and gibberellic acid activity that decreased number branches and spikelets per panicle 34 . However, seldom have we known the mechanism of gene/QTL expression controlling panicle size or spikelet number let alone grain yield through regulations in carbon partitioning or hormonal balance.…”

Section: Discussionmentioning

confidence: 99%

Grain density and its impact on grain filling characteristic of rice: mechanistic testing of the concept in genetically related cultivars

Das

Panda

Shaw

et al. 2018

Sci Rep

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Physiological factors controlling assimilate partitioning was compared in relation to panicle architecture of lax- (Upahar) and compact-panicle (Mahalaxmi) rice cultivars. Grain number and ethylene production at anthesis are low, but filling rate is high in the former compared to high grain number and ethylene production and poor filling trait of the latter. Similar to Mahalaxmi, its progenitors Pankaj and Mahshuri, had attributes of high grain number and grain density, but grain filling was higher and ethylene evolution was lower. Disturbed genetic coherence owing to imbalance of gene groups brought in the cross combinations of Mahshuri and Pankaj could be responsible for high ethylene production leading to semi sterility of Mahalaxmi as the hormone slackened endosperm starch bio-synthesis enzyme activities. Mahalaxmi inherited grain compactness trait of its progenitors, but not the physiological attribute for reduced ethylene production, which impacted grain filling. Upahar, the progeny genotype of Mahalaxmi and IR62 cross, inherited the dominant allele for low ethylene production and good grain filling traits from the high yielding IR62. In conclusion grain filling in compact-panicle rice becomes poor subject to expression of recessive allele for high ethylene production, but the allele is amenable for suppression by corresponding dominant allele in a genetic breeding.

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“…Loss of function of these genes results in lemma-like sterile lemmas (6)(7)(8)(9)(10). In addition, ectopic expression of OsMADS1 causes lemma-like sterile lemmas (11). All these results suggest that the sterile lemma is homologous to the lemma.…”

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confidence: 95%

LATERAL FLORET 1 induced the three-florets spikelet in rice

Zhang

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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The spikelet is a unique inflorescence structure in grass. The molecular mechanisms behind the development and evolution of the spikelet are far from clear. In this study, a dominant rice mutant, lateral florets 1 (lf1), was characterized. In the lf1 spikelet, lateral floral meristems were promoted unexpectedly and could generally blossom into relatively normal florets. LF1 encoded a class III homeodomain-leucine zipper (HD-ZIP III) protein, and the site of mutation in lf1 was located in a putative miRNA165/166 target sequence. Ectopic expression of both LF1 and the meristem maintenance gene OSH1 was detected in the axil of the sterile lemma primordia of the lf1 spikelet. Furthermore, the promoter of OSH1 could be bound directly by LF1 protein. Collectively, these results indicate that the mutation of LF1 induces ectopic expression of OSH1, which results in the initiation of lateral meristems to generate lateral florets in the axil of the sterile lemma. This study thus offers strong evidence in support of the "three-florets spikelet" hypothesis in rice.lateral floret | three-florets spikelet | evolution | yield | rice F lower development is a key process in the reproduction of angiosperms. Under suitable conditions, flowering signals are transmitted to shoot apical meristems (SAMs), which are transformed first into inflorescence meristems (IMs). Floral meristems (FMs) are then initiated on the top and/or lateral domains of the IMs and subsequently transformed into the four whorls of floral organs. The spikelet is a unique unit of inflorescence architecture in grasses and consists of a pair of glumes and a fixed or variable number of florets. Some grassspecific genes are involved in regulating spikelet development. For example, FRIZZY PANICLE (FZP) functions in regulating spikelet meristem (SM) identity in rice. In the fzp mutant, axillary meristems (AMs) are formed instead of FMs, and these then develop into higher-order branches (1). Three genes that encode members of the AP2/ERF superfamily, SUPERNUMERARY BRACT (SNB), INDETERMINATE SPIKELET 1 (OsIDS1), and MULTI-FLORETS SPIKELET 1 (MFS1), are involved in regulating spikelet determinacy in rice (2, 3). In these mutants, the transition from SM to FM is delayed, and extra organs or florets are produced. However, our knowledge about the details of spikelet development in rice remains limited.In most members of Oryzeae, the spikelet is composed of one pair of rudimentary glumes, one pair of sterile lemmas, and one terminal fertile floret, which consists of one pair of hulls (lemma and palea) and inner floral organs (4). Regarding the origin of the sterile lemmas, the "three-florets spikelet" hypothesis proposes that the putative ancestor of the rice spikelet contained two lateral florets in addition to a terminal fertile floret. Subsequently, the lemmas of the two lateral florets degenerated into sterile lemmas, and the inner floral organs and palea degenerated markedly and disappeared during evolution (5). In recent years, several reports have supported this hypot...

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Ectopic expression of OsMADS1 caused dwarfism and spikelet alteration in rice

Cited by 31 publications

References 36 publications

OsMFT1 increases spikelets per panicle and delays heading date in rice by suppressing Ehd1, FZP and SEPALLATA-like genes

OsMFT1 increases spikelets per panicle and delays heading date in rice by suppressing Ehd1, FZP and SEPALLATA-like genes

Grain density and its impact on grain filling characteristic of rice: mechanistic testing of the concept in genetically related cultivars

LATERAL FLORET 1 induced the three-florets spikelet in rice

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