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Five different cDNAs (termed wali1 to wali5 for Wheat Aluminum Induced) whose expression was induced by Al stress have been isolated from the root tips of Al-treated wheat (Triticum aestivum L.) plants. Four of these genes were induced 24 to 96 h after Al treatment, and their expression is reduced when the Al is removed. Each of these four genes was induced by inhibitory levels of Al in two wheat cultivars--Warigal, an Al-sensitive cultivar, and Waalt, an Al-tolerant cultivar. The fifth gene (wali2) showed a complex bimodal pattern of induction and was induced by Al only in the sensitive cultivar. Comparison of the nucleotide sequences of these clones to those in the sequence data bases showed that wali4 is homologous to phenylalanine ammonia-lyase and wali1 is homologous to a group of plant proteins that are cysteine-rich and have homology to metallothioneins. wali2 encodes a novel protein with a repeating motif of cysteine amino acids. The remaining two wali clones (wali3 and wali5) encode related, cysteine-rich proteins that show no significant homology to any known sequences. 相似文献
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Differential regulation of three functional ammonium transporter genes by nitrogen in root hairs and by light in leaves of tomato 总被引:16,自引:0,他引:16
von Wirén N Lauter FR Ninnemann O Gillissen B Walch-Liu P Engels C Jost W Frommer WB 《The Plant journal : for cell and molecular biology》2000,21(2):167-175
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采用水培法比较4种禾本科植物水稻(Oryza sativa L.)、玉米(Zea mays L.)、高粱(Sorghum bicolor(L.)Moench)和小麦(Triticum aestivum L.)8个基因型的抗铝(Al)能力,并对他们在Al积累后细胞壁的多糖组分进行分析。结果显示,在5~200 μmol/L Al处理下,水稻抗Al能力较强,而小麦抗Al能力较弱。在50 μmol/L Al处理下,小麦根尖的果胶和半纤维素1含量的增幅明显高于水稻。水稻基因型‘日本晴’与‘浙辐802’的细胞壁Al含量分别占根尖总Al含量的78.7%和91.6%;小麦基因型‘扬麦18’与‘扬麦16’Al含量分别占根尖总Al含量的64.9%和72.1%。Al吸附-解吸实验结果显示,小麦根尖细胞壁上Al的吸附量高于水稻。研究结果表明,细胞壁是Al积累的主要部位,对Al敏感的水稻和小麦基因型细胞壁中的Al主要分布在果胶中;而对Al耐性较强的水稻和小麦基因型细胞壁中的Al主要分布在半纤维素1中。 相似文献
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G. M. A. Cançado F. T. S. Nogueira S. R. Camargo R. D. Drummond R. A. Jorge M. Menossi 《Biologia Plantarum》2008,52(3):475-485
To investigate the molecular mechanisms of Al toxicity, cross-species cDNA array approach was employed to identify expressed
sequence tags (ESTs) regulated by Al stress in root tips of Al-tolerant maize (Zea mays) genotype Cat100-6 and Al-sensitive genotype S1587-17. Due to the high degree of conservation observed between sugarcane
and maize, we have analyzed the expression profiling of maize genes using 2 304 sugarcane (ESTs) obtained from different libraries.
We have identified 85 ESTs in Al stressed maize root tips with significantly altered expression. Among the up-regulated ESTs,
we have found genes encoding previously identified proteins induced by Al stress, such as phenyl ammonia-lyase, chitinase,
Bowman-Birk proteinase inhibitor, and wali7. In addition, several novel genes up-and downregulated by Al stress were identified
in both genotypes. 相似文献
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Yu Zou Xiaoyu LiuQing Wang Yu ChenCheng Liu Yang QiuWei Zhang 《Biochimica et Biophysica Acta (BBA)/General Subjects》2014