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外源亚精胺通过参与植物激素相互作用、过氧化氢及相关基因表达来提高甜玉米种子的发芽率。

Exogenous spermidine improves seed germination of sweet corn via involvement in phytohormone interactions, HO and relevant gene expression.

作者信息

Huang Yutao, Lin Cheng, He Fei, Li Zhan, Guan Yajing, Hu Qijuan, Hu Jin

机构信息

Seed Science Center, Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China.

出版信息

BMC Plant Biol. 2017 Jan 3;17(1):1. doi: 10.1186/s12870-016-0951-9.

DOI:10.1186/s12870-016-0951-9
PMID:28049439
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5209872/
Abstract

BACKGROUND

The low seed vigor and poor field emergence are main factors that restricting the extension of sweet corn in China. Spermidine (Spd) plays an important role in plant growth and development, but little is known about the effect of Spd on sweet corn seed germination. Therefore the effect of exogenous Spd on seed germination and physiological and biochemical changes during seed imbibition of Xiantian No.5 were investigated in this study.

RESULTS

Spd soaking treatment not only improved seed germination percentage but also significantly enhanced seed vigor which was indicated by higher germination index, vigor index, shoot heights and dry weights of shoot and root compared with the control; while exogenous CHA, the biosynthesis inhibitor of Spd, significantly inhibited seed germination and declined seed vigor. Spd application significantly increased endogenous Spd, gibberellins and ethylene contents and simultaneously reduced ABA concentration in embryos during seed imbibition. In addition, the effects of exogenous Spd on HO and MDA productions were also analyzed. Enhanced HO concentration was observed in Spd-treated seed embryo, while no significant difference of MDA level in seed embryo was observed between Spd treatment and control. However, the lower HO and significantly higher MDA contents than control were detected in CHA-treated seed embryos.

CONCLUSIONS

The results suggested that Spd contributing to fast seed germination and high seed vigor of sweet corn might be closely related with the metabolism of hormones including gibberellins, ABA and ethylene, and with the increase of HO in the radical produced partly from Spd oxidation. In addition, Spd might play an important role in cell membrane integrity maintaining.

摘要

背景

种子活力低和田间出苗差是限制甜玉米在中国推广的主要因素。亚精胺（Spd）在植物生长发育中起重要作用，但关于Spd对甜玉米种子萌发的影响知之甚少。因此，本研究探讨了外源Spd对甜玉米品种“先甜5号”种子萌发及吸胀过程中生理生化变化的影响。

结果

Spd浸种处理不仅提高了种子发芽率，还显著增强了种子活力，表现为与对照相比，发芽指数、活力指数、苗高以及地上部和根部干重更高；而Spd生物合成抑制剂外源环庚草醚（CHA）显著抑制种子萌发并降低种子活力。在种子吸胀过程中，施用Spd显著增加了胚中内源Spd、赤霉素和乙烯含量，同时降低了脱落酸（ABA）浓度。此外，还分析了外源Spd对过氧化氢（HO）和丙二醛（MDA）产生的影响。在经Spd处理的种子胚中观察到HO浓度升高，而在Spd处理和对照之间，种子胚中MDA水平未观察到显著差异。然而，在经CHA处理的种子胚中检测到HO含量低于对照，MDA含量显著高于对照。

结论

结果表明，Spd促进甜玉米种子快速萌发和高活力可能与赤霉素、ABA和乙烯等激素的代谢密切相关，以及与部分由Spd氧化产生的胚根中HO的增加有关。此外，Spd可能在维持细胞膜完整性方面发挥重要作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/9275a20f95a3/12870_2016_951_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/08cc1fba8e3e/12870_2016_951_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/06e5e3a39d12/12870_2016_951_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/7bdefa7fc473/12870_2016_951_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/d031e9a236f2/12870_2016_951_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/27eeba072021/12870_2016_951_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/7a5125d80795/12870_2016_951_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/39922d8fe53d/12870_2016_951_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/9275a20f95a3/12870_2016_951_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/08cc1fba8e3e/12870_2016_951_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/06e5e3a39d12/12870_2016_951_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/7bdefa7fc473/12870_2016_951_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/d031e9a236f2/12870_2016_951_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/27eeba072021/12870_2016_951_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/7a5125d80795/12870_2016_951_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/39922d8fe53d/12870_2016_951_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/435e/5209872/9275a20f95a3/12870_2016_951_Fig8_HTML.jpg

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