大刍草尼加拉瓜玉米不定根组成性气孔形成相关候选基因的筛选

IF 1 Q3 PLANT SCIENCES Plant Root Pub Date : 2012-10-16 DOI:10.3117/PLANTROOT.6.19
T. Abiko, M. Obara, Fumitaka Abe, K. Kawaguchi, A. Oyanagi, Takaki Yamauchi, M. Nakazono
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引用次数: 8

摘要

尼加拉瓜玉米(teosinte),玉米(Zea mays ssp.)的野生近缘种。在排水土壤中,玉米(自交系Mi29)在根皮层形成通气组织,这有助于植物耐涝,而玉米(自交系Mi29)则没有。在控制组成性通气组织形成的数量性状位点(qtl)中,LOD对数最高的位点是1号染色体上的Qaer1.05-6。在这里,我们试图通过比较Mi29, Z.尼加拉瓜ensis和携带Qaer1.05-6的杂种(BC4F1 #62)的cDNA文库来鉴定Qaer1.05-6基因。我们首先证实了在Z. ensis > BC4F1 #62 > Mi29中明显观察到组成性通气组织的形成。从三条细胞系汇集的cdna中组装Contigs。我们在1号染色体区域发现了1868个包含qaer1.06 -6的contigs。筛选这些contigs主要由BC4F1 #62和Z. nicaragua组成(不超过来自Mi29的cdna的10%)。发现了21个这样的contigs,并鉴定了它们所编码的基因。在实时逆转录聚合酶链反应(RT- PCR)分析中,这些基因中的6个在BC4F1 #62中的表达至少是在Mi29中的两倍,使它们成为与组成性通气组织形成相关的基因的候选基因。
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Screening of candidate genes associated with constitutive aerenchyma formation in adventitious roots of the teosinte Zea nicaraguensis
Zea nicaraguensis (teosinte), a wild relative of maize (Zea mays ssp. mays), constitutively forms aerenchyma, which contributes to plant waterlogging tolerance, in the root cortex in drained soil, whereas maize (inbred line Mi29) does not. One with highest logarithm of odds (LOD) among quantitative trait loci (QTLs) that control constitutive aerenchyma formation in Z. nicaraguensis is Qaer1.05-6 on chromosome 1. Here, we attempted to identify genes in Qaer1.05-6 by comparing cDNA libraries from Mi29, Z. nicaraguensis and a hybrid (BC4F1 #62) carrying Qaer1.05-6. We first confirmed that constitutive aerenchyma formation was apparently observed in the order Z. nicaraguensis > BC4F1 #62 > Mi29. Contigs were assembled from cDNAs pooled from the three lines. We identified 1,868 contigs in the region on chromosome 1 that contained Qaer1.05-6. These contigs were screened for contigs that were predominantly composed of cDNAs from BC4F1 #62 and Z. nicaraguensis (no more than 10% of cDNAs from Mi29). Twenty-one such contigs were found and the genes they encoded were identified. In a real-time reverse transcription-polymerase chain reaction (RT- PCR) analysis, expression of six of these genes in BC4F1 #62 was at least double that in Mi29, making them candidates for genes associated with constitutive aerenchyma formation.
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来源期刊
Plant Root
Plant Root PLANT SCIENCES-
CiteScore
1.50
自引率
0.00%
发文量
2
期刊介绍: Plant Root publishes original papers, either theoretical or experimental, that provide novel insights into plant roots. The Journal’s subjects include, but are not restricted to, anatomy and morphology, cellular and molecular biology, biochemistry, physiology, interactions with soil, mineral nutrients, water, symbionts and pathogens, food culture, together with ecological, genetic and methodological aspects related to plant roots and rhizosphere. Work at any scale, from the molecular to the community level, is welcomed.
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