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1.
Science ; 361(6398): 181-186, 2018 07 13.
Artigo em Inglês | MEDLINE | ID: mdl-30002253

RESUMO

Most plants do poorly when flooded. Certain rice varieties, known as deepwater rice, survive periodic flooding and consequent oxygen deficiency by activating internode growth of stems to keep above the water. Here, we identify the gibberellin biosynthesis gene, SD1 (SEMIDWARF1), whose loss-of-function allele catapulted the rice Green Revolution, as being responsible for submergence-induced internode elongation. When submerged, plants carrying the deepwater rice-specific SD1 haplotype amplify a signaling relay in which the SD1 gene is transcriptionally activated by an ethylene-responsive transcription factor, OsEIL1a. The SD1 protein directs increased synthesis of gibberellins, largely GA4, which promote internode elongation. Evolutionary analysis shows that the deepwater rice-specific haplotype was derived from standing variation in wild rice and selected for deepwater rice cultivation in Bangladesh.


Assuntos
Adaptação Fisiológica , Etilenos/metabolismo , Inundações , Genes de Plantas/fisiologia , Giberelinas/fisiologia , Oryza/crescimento & desenvolvimento , Fatores de Transcrição/fisiologia , Alelos , Giberelinas/genética , Haplótipos , Oryza/genética , Fatores de Transcrição/genética
2.
Biosci Biotechnol Biochem ; 75(12): 2316-20, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-22146717

RESUMO

Recently we reported that rice salicylic acid (SA) glucosyltransferase (OsSGT) is active toward 12-hydroxyjasmonic acid (tuberonic acid, TA) and that OsSGT gene expression is induced by wounding stress. Here we report that tobacco SA glucosyltransferase (NtSGT), which is thought to be an ortholog of OsSGT, is also active toward TA. Although NtSGT expression is known to be induced by biotrophic stress, it was also induced by wounding stress in the same manner as OsSGT. These results indicate that this glucosyltransferase is important not only in biotrophic stress but also for wounding stress. It was found that this enzyme is dually functional, with activity both toward TA and SA.


Assuntos
Acetatos/metabolismo , Ciclopentanos/metabolismo , Glucosiltransferases/metabolismo , Fenômenos Mecânicos , Nicotiana/enzimologia , Nicotiana/fisiologia , Salicilatos/metabolismo , Estresse Fisiológico , Indução Enzimática , Regulação da Expressão Gênica de Plantas , Glucosiltransferases/biossíntese , Glucosiltransferases/genética , Oxilipinas/metabolismo , Doenças das Plantas , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Transdução de Sinais , Nicotiana/citologia , Nicotiana/genética
3.
Biosci Biotechnol Biochem ; 73(9): 1962-70, 2009 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-19734678

RESUMO

In plants, the mobile signal needed for wound-induced systemic acquired resistance (WSR) has been elusive. The signal compound involved in WSR is supposed to be JA or its derivatives. On the basis of kinetic study of the accumulation of JA or its derivatives, it was discovered that JA, JA-Ile, tuberonic acid (TA, 12-OH epi-JA), and tuberonic acid glucoside (TAG) accumulated in systemic tissues in response to mechanical wounding stress in the tobacco plant (Nicotiana tabacum). Attempts to recover deuterium-labeled JA in systemic leaves after feeding the wounded leaves with deuterium-labeled JA were successfully done. It was also found that the translocated deuterium-labeled JA was metabolized to TA in systemic leaves under feeding of deuterium-labeled JA to the wounding leaves.


Assuntos
Ciclopentanos/metabolismo , Nicotiana/metabolismo , Oxilipinas/metabolismo , Folhas de Planta/metabolismo , Transporte Biológico , Cromatografia Líquida , Cinética , Espectrometria de Massas por Ionização por Electrospray , Espectrometria de Massas em Tandem
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