Rice OsGA2ox9 regulates seed GA metabolism and dormancy

Chen, S.Y.; Zhang, Xiaofan; Xue, Hong

doi:10.1111/pbi.14067

Cited by 16 publications

(7 citation statements)

References 9 publications

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“…In addition, the osnac120 mutants exhibited reduced panicle length and seed setting ( supplemental Figure 3 ). Consistent with our observations, GA-deficient mutants develop abnormal floral organs, produce semifertile flowers, and are thus severely defective in flower and seed development ( Sakamoto et al., 2004 ; Hedden and Sponsel, 2015 ; Xing et al., 2023 ). More work will be needed to gain insight into the regulation of reproductive development by OsNAC120 through modulation of GA signaling.…”

Section: Discussionsupporting

confidence: 91%

“…Gibberellin (GA) and ABA are known to regulate plant growth and stress tolerance in opposite ways ( Hu et al., 2019 ; Shohat et al., 2020 ). As a growth-promoting hormone, GA plays an important regulatory role in physiological processes such as seed germination, leaf expansion, stem elongation, flower formation, and fruit and seed development ( Sasaki et al., 2002 ; Sakamoto et al., 2004 ; Hauvermale et al., 2012 ; Daviere and Achard, 2013 ; Fukazawa et al., 2021 ; Xing et al., 2023 ). With the help of the GA receptor GIBBERELLIN INSENSITIVE DWARF1 (GID1) and the F-box protein GID2, GA signaling is mediated by removing the inhibition of DELLA protein, a GA signaling inhibitor ( Hirano et al., 2010 ).…”

Section: Introductionmentioning

confidence: 99%

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OsNAC120 balances plant growth and drought tolerance by integrating GA and ABA signaling in rice

Xie,

Jin,

Sun

et al. 2024

Plant Communications

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

OsNAC120 balances plant growth and drought tolerance by integrating GA and ABA signaling in rice

Xie,

Jin,

Sun

et al. 2024

Plant Communications

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“…OsGA2ox9 is transcribed in a variety of tissues, including rice roots, leaves, pollen, and seeds [ 40 ]. It was shown that OsGA2ox9 knockout lines germinate spikes under continuous rainy weather, whereas seed dormancy was increased in overexpressing lines, but this was restored by externally applied GA3; OsAmy (α-amylase isozyme 3D) expression was significantly increased in OsGA2ox9 knockout seeds, and the amount of glucose and sucrose in the seeds of the knockout lines was found to be increased; thus, OsGA2ox9 may regulate the transcription of α-amylase-encoding genes through GA signaling, which promotes the hydrolysis of starch to soluble sugars and inhibits ABA signaling, leading to spike germination [ 40 ]. Two genes, Os01g0159250 and Os06g0619000 , were not cloned.…”

Section: Discussionmentioning

confidence: 99%

Mapping of Candidate Genes for Nitrogen Uptake and Utilization in Japonica Rice at Seedling Stage

Chen,

Ma,

Xia

et al. 2024

Genes

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Nitrogen (N) is one of the essential nutrients for the growth and development of crops. The adequate application of N not only increases the yield of crops but also improves the quality of agricultural products, but the excessive application of N can cause many adverse effects on ecology and the environment. In this study, genome-wide association analysis (GWAS) was performed under low- and high-N conditions based on 788,396 SNPs and phenotypic traits relevant to N uptake and utilization (N content and N accumulation). A total of 75 QTLs were obtained using GWAS, which contained 811 genes. Of 811 genes, 281 genes showed different haplotypes, and 40 genes had significant phenotypic differences among different haplotypes. Of these 40 genes, 5 differentially expressed genes (Os01g0159250, Os02g0618200, Os02g0618400, Os02g0630300, and Os06g0619000) were finally identified as the more valuable candidate genes based on the transcriptome data sequenced from Longjing31 (low-N-tolerant variety) and Songjing 10 (low-N-sensitive variety) under low- and high-N treatments. These new findings enrich the genetic resources for N uptake and utilization in rice, as well as lay a theoretical foundation for improving the efficiency of N uptake and utilization in rice.

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“…GAs are tetracyclic diterpenoid compounds synthesized biologically from geranylgeranyl diphosphate (GGDP) 249 and in higher plants, three classes of enzymes (GA1, GA2, & GA3) are involved in the conversion of GGDP into active GAs, 250 while the loss-of-function of GA20ox showed reduced germination. 251 Under abiotic stresses, reduced GAs biosynthesis results in reduced SG, 252 while MEL acts as positive regulator of GA biosynthesis. 27 MEL induced higher germination index and germination percentage were associated with higher GA production, higher expression of gene GAs biosynthesis genes (GA20ox and GA3ox), 240 and GID1 (a GA receptor), 253 and regulation of DELLA proteins in the GA signaling pathway.…”

Section: Crosstalk Between Mel and Gasmentioning

confidence: 99%

Section: Mel‐induced Common Responses For Regulating Sg Under Abiotic...mentioning

confidence: 99%

Melatonin as a key regulator in seed germination under abiotic stress

Wang,

Tanveer,

Wang

et al. 2024

Journal of Pineal Research

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Seed germination (SG) is the first stage in a plant's life and has an immense importance in sustaining crop production. Abiotic stresses reduce SG by increasing the deterioration of seed quality, and reducing germination potential, and seed vigor. Thus, to achieve a sustainable level of crop yield, it is important to improve SG under abiotic stress conditions. Melatonin (MEL) is an important biomolecule that interplays in developmental processes and regulates many adaptive responses in plants, especially under abiotic stresses. Thus, this review specifically summarizes and discusses the mechanistic basis of MEL‐mediated SG under abiotic stresses. MEL regulates SG by regulating some stress‐specific responses and some common responses. For instance, MEL induced stress specific responses include the regulation of ionic homeostasis, and hydrolysis of storage proteins under salinity stress, regulation of C‐repeat binding factors signaling under cold stress, starch metabolism under high temperature and heavy metal stress, and activation of aquaporins and accumulation of osmolytes under drought stress. On other hand, MEL mediated regulation of gibberellins biosynthesis and abscisic acid catabolism, redox homeostasis, and Ca2+ signaling are amongst the common responses. Nonetheless factors such as endogenous MEL contents, plant species, and growth conditions also influence above‐mentioned responses. In conclusion, MEL regulates SG under abiotic stress conditions by interacting with different physiological mechanisms.

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Rice OsGA2ox9 regulates seed GA metabolism and dormancy

Cited by 16 publications

References 9 publications

OsNAC120 balances plant growth and drought tolerance by integrating GA and ABA signaling in rice

OsNAC120 balances plant growth and drought tolerance by integrating GA and ABA signaling in rice

Mapping of Candidate Genes for Nitrogen Uptake and Utilization in Japonica Rice at Seedling Stage

Melatonin as a key regulator in seed germination under abiotic stress

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