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作物学报 ›› 2009, Vol. 35 ›› Issue (12): 2150-2158.doi: 10.3724/SP.J.1006.2009.02150

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

中棉所12配制的2个杂交棉DNA甲基化遗传与传递

朱新霞1,2,汪保华1,郭旺珍1,张天真1,*   

  1. 1南京农业大学作物遗传与种质创新国家重点实验室/棉花研究所,江苏南京210095;2石河子大学生命科学院,新疆石河子 832000
  • 收稿日期:2009-04-13 修回日期:2009-07-25 出版日期:2009-12-10 网络出版日期:2009-10-13
  • 通讯作者: 张天真,E-mail:cotton@njau.edu.cn;Fax:025-84395307
  • 基金资助:

    本研究由国家重点基础研究发展计划(973计划)项目(2006CB101708)和高等学校创新引智计划(B08025)资助.

Inheritance of DNA Methylation in Two Cotton Hybrid Dericed from CRI-12

ZHU Xin-Xia1,2,WANG Bao-Hua1,GUO Wang-Zhen1,ZHANG Tian-Zhen1,*   

  1. 1National Key Laboratory of Crop Genetics & Germplasm Enhancement,Nanjing Agricultural University,Nanjing 210095,China;2Life Science College of Shihezi University,Shihezi 832003,China
  • Received:2009-04-13 Revised:2009-07-25 Published:2009-12-10 Published online:2009-10-13
  • Contact: ZHANG Tian-Zhen,E-mail:cotton@njau.edu.cn;Fax:025-84395307

摘要:

DNA甲基化在真核生物的生长发育过程中起着重要的调控作用。本研究用MSAP方法分析了中棉所12配制的2个杂交棉和亲本不同发育时期的基因组DNA 5′-CCGG位点胞嘧啶的甲基化水平及其遗传传递模式。研究表明: (1)杂交棉及其亲本不同发育时期的胞嘧啶甲基化水平不同,随着生育期的逐步推进,出现两头低而中间高现象;(2)两个杂交棉组合的DNA 甲基化总体水平为12.41%~20.05%,其中以内侧胞嘧啶全甲基化为主(约占6.90%~11.47%)(3)棉花中绝大多数CCGG胞嘧啶甲基化位点是由亲本稳定遗传给杂交种的,但杂交棉仍有1.14%~3.39%的位点显示了变异,其变异频率在不同亲本组合之间和不同发育时期都存在差异;(4)对甲基化差异条带测序分析发现,其功能涉及到富含亮氨酸重复、类PDRABC转运蛋白、GTP结合蛋白、病程相关蛋白、磷酸激酶、功能未知的蛋白质和反转录酶等,部分差异序列没有产生有意义的匹配。

关键词: 中棉所12, 杂交棉, 甲基化, MSAP

Abstract:

DNA methylation in the form of cytosine methylation is proposed as an evolutionary event, which contributes to genome evolution and plays an important role in maintaining genome integrity and controlling dynamics of gene activity. Hybridization and polyploidization play significant roles in the evolution of higher plants. Compared with animals, cytosine methylation is more abundant in plants, particularly at genomic regions containing transposons and their derivatives. Accumulated evidence had suggested that DNA methylation plays important roles in normal plant development. In different stages of plant growth, the changes in DNA methylation level play an important role in response to variations of its heredity and the environment. Notwithstanding these interesting findings, the causing factors for, and generality of, methylation dynamics in plants, particularly with hybrid formation and trans-generational heritability, remained largely vague. However, there is a paucity of evidence to support any direct link between the epigenetic phenomena of cytosine methylation alteration and gene silencing following hybridization and polyploidization. In this study, MSAP (methylation-sensitive amplified fragment length polymorphism) was used in this study to detect the DNA methylation patterns in the 5′-CCGG sites of two cotton hybrid derived from CRI-12 and their parents for understanding developmental stability and inheritance of cytosine methylation. It was found MSAP ratios, which were the ratios of MSAP type in the two cotton hybrids were 12.41%–20.05%, cytosine methylation profiles were variable, from increase to decrease during plant growth and development. Full methylation of internal cytosine (6.90%–11.47%) was the dominant in two cotton hybrids. Meanwhile, the MSAP profiles enable the monitoring of inheritance or variation of parental methylation patterns in hybrid progenies. It was found that a great majority (from 96.6 % to 98.86 %, depending on crosses) of the methylation profiles in cotton inbred lines transmitted to the inter-strain hybrids; however, from 1.14% to 3.39% of the profiles in the hybrids exhibited variation from the expected parental additivity. Both inherited and altered methylation profiles can be divided into distinct groups, and their frequencies are variable among the cross-combinations, and during plant growth and development. Bands in hybrids that appeared in both groups digested by Hpa II-EcoR I and Msp I-EcoR I, which were inherited from either or both of the maternal and paternal parent—this type apparently comprised the greatest majority, as all monomorphic bands belong to this type. In addition, sequencing of differentially methylated fragments and subsequent homology analysis of isolated bands that showed variation in hybrids indicated that diverse sequences were involved, including known-function cellular genes and mobile elements, Such as leucine-rich repeat family protein, PDR-like ABC-transporter, putative oligopeptide transporter, GTP-binding protein, similar to pathogenesis-related protein, DOMON domain-containing protein, putative adenosine phosphosulfate kinase, putative protein, RNA-directed DNA polymerase. The remaining 14 bands showed no homology to the database sequences. These results clearly demonstrated the power of the MSAP technique for large-scale DNA methylation detection in the cotton genome, and the complexity of DNA methylation change during plant growth and development. The different methylation levels may be induced by interspecific hybridization between two cotton hybrids, and indicated a direct relationship between cytosine methylation alteration and gene expression variation.

Key words: CRI-12, Hybrids cotton, DNA methylation, MSAP

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