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转录组分析为毛竹（Phyllostachys edulis）笋的木质部形成提供了见解。

Transcriptome analysis provides insights into xylogenesis formation in Moso bamboo (Phyllostachys edulis) shoot.

机构信息

State Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang A&F University, Lin'an, 311300, Zhejiang Province, People's Republic of China.

Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, Guangzhou, 510642, China.

出版信息

Sci Rep. 2018 Mar 2;8(1):3951. doi: 10.1038/s41598-018-21766-3.

DOI:10.1038/s41598-018-21766-3
PMID:29500441
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5834459/
Abstract

Maturation-related changes in cell wall composition and the molecular mechanisms underlying cell wall changes were investigated from the apical, middle and basal segments in moso bamboo shoot (MBS). With maturation extent from apical to basal regions in MBS, lignin and cellulose content increased, whereas heteroxylan exhibited a decreasing trend. Activities of phenylalanine amonnialyase (PAL), cinnamyl alcohol dehydrogenase (CAD) and cinnamate-4-hydroxylase (C4H), which are involved in lignin biosynthesis, increased rapidly from the apex to the base sections. The comparative transcriptomic analysis was carried out to identify some key genes involved in secondary cell walls (SCW) formation underlying the cell wall compositions changes including 63, 8, 18, and 31 functional unigenes encoding biosynthesis of lignin, cellulose, xylan and NAC-MYB-based transcription factors, respectively. Genes related to secondary cell wall formation and lignin biosynthesis had higher expression levels in the middle and basal segments compared to those in the apical segments. Furthermore, the expression profile of PePAL gene showed positive relationships with cellulose-related gene PeCESA4, xylan-related genes PeIRX9 and PeIRX10. Our results indicated that lignification occurred in the more mature middle and basal segments in MBS at harvest while lignification of MBS were correlated with higher expression levels of PeCESA4, PeIRX9 and PeIRX10 genes.

摘要

对来自毛竹竹笋（MBS）的顶端、中部和基部节段的细胞壁组成的成熟相关变化及其细胞壁变化的分子机制进行了研究。随着 MBS 从顶端到基部区域的成熟程度增加，木质素和纤维素含量增加，而异戊酰基木聚糖呈下降趋势。苯丙氨酸氨裂解酶（PAL）、肉桂醇脱氢酶（CAD）和肉桂酸-4-羟化酶（C4H）的活性迅速增加，这些酶参与木质素生物合成，从顶端到基部迅速增加。进行了比较转录组分析，以鉴定参与细胞壁组成变化的次生细胞壁（SCW）形成的一些关键基因，包括 63、8、18 和 31 个分别编码木质素、纤维素、木聚糖和 NAC-MYB 转录因子生物合成的功能基因。与次生细胞壁形成和木质素生物合成相关的基因在中部和基部的表达水平高于顶端。此外，PePAL 基因的表达谱与纤维素相关基因 PeCESA4、木聚糖相关基因 PeIRX9 和 PeIRX10 呈正相关。我们的结果表明，在收获时，MBS 的更成熟的中部和基部区域发生木质化，而 MBS 的木质化与 PeCESA4、PeIRX9 和 PeIRX10 基因的高表达水平相关。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/4fdbbb63d7c0/41598_2018_21766_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/c6337b69063f/41598_2018_21766_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/78e8da2ff06b/41598_2018_21766_Fig2_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/9b7b30dbf851/41598_2018_21766_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/d30e14f230ad/41598_2018_21766_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/23547d168df6/41598_2018_21766_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/314a7a64c859/41598_2018_21766_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/faae1ff9f86c/41598_2018_21766_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/7358fa63693d/41598_2018_21766_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/4fdbbb63d7c0/41598_2018_21766_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/c6337b69063f/41598_2018_21766_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/78e8da2ff06b/41598_2018_21766_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/487adbdb7d35/41598_2018_21766_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/9b7b30dbf851/41598_2018_21766_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/d30e14f230ad/41598_2018_21766_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/23547d168df6/41598_2018_21766_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/314a7a64c859/41598_2018_21766_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/faae1ff9f86c/41598_2018_21766_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/7358fa63693d/41598_2018_21766_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c76f/5834459/4fdbbb63d7c0/41598_2018_21766_Fig10_HTML.jpg

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