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Ethylene regulates post-germination seedling growth in wheat through spatial and temporal modulation of ABA/GA balance.
J Exp Bot 2019JE

Abstract

This study aimed to gain insights into the molecular mechanisms underlying the role of ethylene in regulating germination and seedling growth in wheat by combining pharmacological, molecular and metabolomics approaches. Our study showed that ethylene does not affect radicle protrusion but controls post-germination endospermic starch degradation through transcriptional regulation of specific α-amylase and α-glucosidase genes, and this effect is mediated by alteration of endospermic bioactive GA levels, and GA sensitivity via expression of TaGAMYB. Our data implicated ethylene as a positive regulator of embryo axis and coleoptile growth through transcriptional regulation of specific TaEXPA genes, and these effects are associated with modulation of GA levels and sensitivity, through expression of GA metabolism (TaGA20ox1, TaGA3ox2 and TaGA2ox6) and TaGAMYB genes, respectively, and/or ABA level and sensitivity, via expression of specific ABA metabolism (TaNCED2 or TaCYP707A1) and signaling (TaABI3) genes, respectively. Ethylene appeared to regulate the expression of TaEXPA3 and thereby root growth through its control of coleoptilar ABA metabolism, and root ABA signaling via expression of TaABI3 and TaABI5. These results show that spatiotemporal modulation of ABA/GA balance mediates the role of ethylene in regulating post-germination starch degradation and seedling growth in wheat.

Authors+Show Affiliations

Department of Plant Science 222 Agriculture Building University of Manitoba Winnipeg, Manitoba Canada.Department of Plant Science 222 Agriculture Building University of Manitoba Winnipeg, Manitoba Canada.Grain Research Laboratory Canadian Grain Commission Winnipeg, Manitoba Canada.Department of Plant Science 222 Agriculture Building University of Manitoba Winnipeg, Manitoba Canada.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31872216

Citation

Sun, Menghan, et al. "Ethylene Regulates Post-germination Seedling Growth in Wheat Through Spatial and Temporal Modulation of ABA/GA Balance." Journal of Experimental Botany, 2019.
Sun M, Anh Tuan P, Izydorczyk MS, et al. Ethylene regulates post-germination seedling growth in wheat through spatial and temporal modulation of ABA/GA balance. J Exp Bot. 2019.
Sun, M., Anh Tuan, P., Izydorczyk, M. S., & Ayele, B. T. (2019). Ethylene regulates post-germination seedling growth in wheat through spatial and temporal modulation of ABA/GA balance. Journal of Experimental Botany, doi:10.1093/jxb/erz566.
Sun M, et al. Ethylene Regulates Post-germination Seedling Growth in Wheat Through Spatial and Temporal Modulation of ABA/GA Balance. J Exp Bot. 2019 Dec 24; PubMed PMID: 31872216.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ethylene regulates post-germination seedling growth in wheat through spatial and temporal modulation of ABA/GA balance. AU - Sun,Menghan, AU - Anh Tuan,Pham, AU - Izydorczyk,Marta S, AU - Ayele,Belay T, Y1 - 2019/12/24/ PY - 2019/09/24/received PY - 2019/12/25/entrez KW - coleoptile KW - embryo axis KW - gene expression KW - germination KW - plant hormones KW - root KW - seedling KW - starch degradation JF - Journal of experimental botany JO - J. Exp. Bot. N2 - This study aimed to gain insights into the molecular mechanisms underlying the role of ethylene in regulating germination and seedling growth in wheat by combining pharmacological, molecular and metabolomics approaches. Our study showed that ethylene does not affect radicle protrusion but controls post-germination endospermic starch degradation through transcriptional regulation of specific α-amylase and α-glucosidase genes, and this effect is mediated by alteration of endospermic bioactive GA levels, and GA sensitivity via expression of TaGAMYB. Our data implicated ethylene as a positive regulator of embryo axis and coleoptile growth through transcriptional regulation of specific TaEXPA genes, and these effects are associated with modulation of GA levels and sensitivity, through expression of GA metabolism (TaGA20ox1, TaGA3ox2 and TaGA2ox6) and TaGAMYB genes, respectively, and/or ABA level and sensitivity, via expression of specific ABA metabolism (TaNCED2 or TaCYP707A1) and signaling (TaABI3) genes, respectively. Ethylene appeared to regulate the expression of TaEXPA3 and thereby root growth through its control of coleoptilar ABA metabolism, and root ABA signaling via expression of TaABI3 and TaABI5. These results show that spatiotemporal modulation of ABA/GA balance mediates the role of ethylene in regulating post-germination starch degradation and seedling growth in wheat. SN - 1460-2431 UR - https://www.unboundmedicine.com/medline/citation/31872216/Ethylene_regulates_post-germination_seedling_growth_in_wheat_through_spatial_and_temporal_modulation_of_ABA/GA_balance L2 - https://academic.oup.com/jxb/article-lookup/doi/10.1093/jxb/erz566 DB - PRIME DP - Unbound Medicine ER -