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The B-hordein gene family was analyzed from two Tibetan hull-less barley cultivars Z09 and Z26 (Hordeum vulgare subsp. vulgare). Fourteen B-hordein genes, designated BZ09-2 to BZ09-5 (from Z09) and BZ26-1 to BZ26-10 (from Z26), were sequenced. Seven of them, similar to a previously reported BZ09-1 from Z09, were predicted to encode putative active proteins each with a signal peptide, a repetitive domain, and a C-terminal
region; seven of them were predicted to be pseudogenes. The B-hordein gene family was analyzed using all known representatives of B-hordein sequences and two most similar LMW-GSs of Triticum aestivum. Alignment of these seven putative proteins with known B-hordeins and two most similar LMW-GSs of T. aestivum revealed that they shared a common motif. A large variation was observed between numbers of repeat units of predicted B-hordeins
of Z26 and Z09. Phylogenetic analysis revealed that all BZ26 clones were clustered in a subgroup, and BZ09-1 formed another
subgroup by itself in the putative eight active genes. In addition, six 5′-upstream regulatory sequences of the B-hordein genes were isolated from the two accessions by a single oligonucleotide nested PCR, and several different mutations were
identified in the cis-acting element GLM and two distinctive sequences (Z09P-2 and Z26P-3). Phylogenetic analysis of 5′-upstream regulatory regions of the B-hordein genes showed that members from the same accession were clustered together except for two distinct members. Quantitative real
time PCR analysis indicated distinct expression levels of B-hordein genes in four developing stages of developing grains in two accessions. These findings suggest B-hordein genes have intrinsic differences between accessions, and this knowledge will be useful for incorporating the B-hordeins protein
in barley breeding programs. 相似文献
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Junjun Liang Guangbing Deng Hai Long Zhifen Pan Chunping Wang Peng Cai Deling Xu Zha-Xi Nima Maoqun Yu 《Molecular breeding : new strategies in plant improvement》2012,30(1):441-451
Expression of the late embryogenesis abundant (LEA) gene is usually associated with plant response to dehydration. In this study, a drought-tolerant genotype was screened from 48 accessions of Tibetan hulless barley (Hordeum vulgare ssp. vulgare). By using virus-induced gene silencing, the influence of two LEA genes (HVA1 and Dhn6) on drought tolerance of Tibetan hulless barley was investigated. Results of quantitative real-time PCR indicated that the relative expression levels of HVA1 and Dhn6 in silenced plants were significantly reduced compared with control plants. Both HVA1-silenced and Dhn6-silenced plants showed a consequently lower survival rate than control plants under drought stress. However, only HVA1-silenced plants exhibited a significantly higher water loss rate (WLR). These results suggested that HVA1 and Dhn6 might participate in adaptive responses to water deficit in different ways. Vegetative growth of HVA1-silenced plants was significantly retarded even under optimal growth conditions, and their biomass accumulation was also much lower than that of the controls. These results indicate that HVA1 might play a role in vegetative growth of Tibetan hulless barley. 相似文献
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通过种子半粒法,采用聚丙烯酰胺凝胶等电电泳和人工接种Meloidogynenaasi抗性鉴定相结合,分析Ae.variabilisNo.1×Ae.variabilisNo.2F2植株酯酶Est-5标记同功酶与抗性基因Rkn-mnl连锁程度,发现标记同功酶受染色体3U或3S~V长臂上1对共显性基因控制,与抗性基因连锁程度较高,重组率为12.96±0.40%,图距为13.26±10.46分摩。这样,在抗性基因Rkn-mnl转移中,可利用标记同功酶大量、快速、高效鉴定植株抗线虫性。 相似文献
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Haili Zhang Qiulan Huang Ling Yi Xiaona Song Lin Li Guangbing Deng Junjun Liang Fang Chen Maoqun Yu Hai Long 《The Plant journal : for cell and molecular biology》2021,107(3):698-712
The pathogen cereal cyst nematode (CCN) is deleterious to Triticeae crops and is a threat to the global crop yield. Accession no. 1 of Aegilops variabilis, a relative of Triticum aestivum (bread wheat), is highly resistant to CCN. Our previous study demonstrated that the expression of the phenylalanine ammonia lyase (PAL) gene AevPAL1 in Ae. variabilis is strongly induced by CCN. PAL, the first enzyme of phenylpropanoid metabolism, is involved in abiotic and biotic stress responses. However, its role in plant–CCN interaction remains unknown. In the present study, we proved that AevPAL1 helps to confer CCN resistance through affecting the synthesis of salicylic acid (SA) and downstream secondary metabolites. The silencing of AevPAL1 increased the incidence of CCN infection in roots and decreased the accumulation of SA and phenylalanine (Phe)-derived specialized metabolites. The exogenous pre-application of SA also improved CCN resistance. Additionally, the functions of PAL in phenylpropanoid metabolism correlated with tryptophan decarboxylase (TDC) functioning in tryptophan metabolism pathways. The silencing of either AevPAL1 or AevTDC1 exhibited a concomitant reduction in the expression of both genes and the contents of metabolites downstream of PAL and TDC. These results suggested that AevPAL1, possibly in coordination with AevTDC1, positively contributes to CCN resistance by altering the downstream secondary metabolites and SA content in Ae. variabilis. Moreover, AevPAL1 overexpression significantly enhanced CCN resistance in bread wheat and did not exhibit significant negative effects on yield-related traits, suggesting that AevPAL1 is valuable for the genetic improvement of CCN resistance in bread wheat. 相似文献