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  • 1
    Electronic Resource
    Electronic Resource
    A mutation causing proline requirement in Zea mays (1975)
    Springer
    Theoretical and applied genetics 46 (1975), S. 339-345 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A conditional seedling lethal, monogenic recessive, endosperm mutant is described. Phenotypic can be accomplished when embryos are cultured in vitro on media supplemented with proline. The efficiency of the repair is proportional to the concentration of proline in the medium. Normal growth is resumed at a dose of 160 mg/l. All the data collected are most easily interpreted by assuming that the mutant, symbolized pro has a genetic block in the biosynthetic route leading to proline. This is probably the first case of a strict genetic requirement for an amino acid to be reported in Zea mays. The possible reasons for the difficulties encountered in isolating obligate auxotrophs in higher plants are briefly reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00281675
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  • 2
    Electronic Resource
    Electronic Resource
    Cloning and molecular analysis of structural genes involved in flavonoid and stilbene biosynthesis in grape (Vitis vinifera L.) (1994)
    Springer
    Plant molecular biology 24 (1994), S. 743-755 
    Details
    ISSN: 1573-5028
    Keywords: anthocyanins ; cDNA cloning ; flavonoids ; gene expression ; genomic organization ; stilbenes ; Vitis vinifera L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genes involved in flavonoid and stilbene biosynthesis were isolated from grape (Vitis vinifera L.). Clones coding for phenylalanine ammonia-lyase (PAL), chalcone synthase (CHS), chalcone isomerase (CHI), flavanone 3-hydoxylase (F3H), dihydroflavonol 4-reductase (DFR), leucoanthocyanidin dioxygenase (LDOX) and UDP glucose:flavonoid 3-O-glucosyl transferase (UFGT), were isolated by screening a cDNA library, obtained from mRNA from seedlings grown in light for 48 h using snapdragon (Antirrhinum majus) and maize heterologous probes. A cDNA clone coding for stilbene synthase (StSy) was isolated by probing the library with a specific oligonucleotide. These clones were sequenced and when the putative products were compared to the published amino acid sequence for corresponding enzymes, the percentages of similarity ranged from 65% (UFGT) to 90% (CHS and PAL). The analysis of the genomic organization and expression of these genes in response to light shows that PAL and StSy genes belong to large multigene families, while the others are present in one to four copies per haploid genome. The steady-state level of mRNAs encoded by the flavonoid biosynthetic genes as determined in young seedlings is coordinately induced by light, except for PAL and StSy, which appear to be constitutively expressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029856
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic and molecular analysis of Sn, a light-inducible, tissue specific regulatory gene in maize (1991)
    Springer
    Molecular genetics and genomics 225 (1991), S. 401-410 
    Details
    ISSN: 1617-4623
    Keywords: Flavonoids ; Light regulation ; Sn locus ; Tissue-specificity ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The Sn locus of maize is functionally similar to the R and B loci, in that Sn differentially controls the tissue-specific deposition of anthocyanin pigments in certain seedling and plant cells. We show that Sn shows molecular similarity to the R gene and have used R DNA probes to characterize several Sn alleles. Northern analysis demonstrates that all Sn alleles encode a 2.5 kb transcript, which is expressed in a tissue-specific fashion consistent with the distribution of anthocyanins. Expression of the Sn gene is light-regulated. However, the Sn: bol3 allele allows Sn mRNA transcription to occur in the dark, leading to pigmentation in dark-grown seedlings and cob integuments. We report the isolation of genomic and cDNA clones of the light-independent Sn: bol3 allele. Using Sn cDNA as a probe, the spatial and temporal expression of Sn has been examined. The cell-specific localization of Sn mRNA has been confirmed by in situ hybridization using labelled antisense RNA probes. According to its proposed regulatory role, expression of Sn precedes and, in turn, causes a coordinate and tissue-specific accumulation of mRNA of structural genes for pigment synthesis and deposition, such as A1 and C2. The functional and structural relationship between R, B, Lc and Sn is discussed in terms of an evolutionary derivation from a single ancestral gene which gave rise this diverse gene family by successive duplication events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261680
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  • 4
    Electronic Resource
    Electronic Resource
    Antiparallel expression of the sense and antisense transcripts of maize α-tubulin genes (1993)
    Springer
    Molecular genetics and genomics 241 (1993), S. 161-169 
    Details
    ISSN: 1617-4623
    Keywords: α-Tubulin ; Zea mays ; In situ hybridization ; Developmental expression ; Antisense RNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In all eukaryotes α- and β-tubulins are encoded by small families of closely related genes and are highly conserved. In Zea mays, at least six different α-tubulin coding sequences are known. We describe the isolation from scutellar nodes of the maize inbred line W22 of a clone (CTM5) coding for an α-tubulin. On the basis of the 3′ end nucleotide sequence, this clone can be assigned to the already reported tua4 gene. Northern analysis demonstrates that CTM5 encodes a 1.5 kb transcript, which is expressed in different tissues of the seed and of the seedling. In order to define the spatial and temporal expression of α-tubulin genes, in situ hybridization experiments were performed on these tissues. Unexpectedly, a specific signal was detected with both antisense and sense RNA strands. Temporal and spatial distribution of the two RNAs, however, shows that high levels of the two transcripts are always discordant. In tissues where sense transcripts are highly abundant (embryos at various developmental stages, root tips, pollen grains), the antisense transcripts are expressed in relatively small amounts, while in pericarp, coleoptile, leaves, and scutellar node, where antisense transcripts accumulate, the sense transcript only reaches a very low level. Northern analysis using single-stranded DNA probes confirmed the presence of an antisense transcript of 1.5 kb, prompting speculation about the role of this transcript in the regulation of the expression of α-tubulin genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280213
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  • 5
    Electronic Resource
    Electronic Resource
    Light inducibility and tissue specificity of theR gene family in maize (1994)
    Springer
    Genetica 94 (1994), S. 225-234 
    Details
    ISSN: 1573-6857
    Keywords: anthocyanin ; maize ; helix-loop-helix ; tissue specificity ; paramutation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The red and purple anthocyanin pigments of plants are visible genetic markers and their spatial and temporal accumulation is strictly regulated. Anthocyanin biosynthesis is also modulated by environmental factors such as light and temperature. Thus this process represents an appealing model system for the study of gene regulation, as well as for studying developmental biology. In maize, the pattern of pigmentation of the plant is controlled by theR, Sn andB genes, a small family of HLH transcription factors. Here we report the pattern of light induction and tissue specific expression of the regulatory and structural genes involved in this biosynthesis. TwoSn alleles differing in their light response have been considered and analyzed by Northern andin situ hybridization experiments. An unusual phenomenon of interaction between the homologousR andSn genes leading to a partial gene silencing is reported. We hypothesize a model in which silencing is achieved through methylation of specific sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01443436
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  • 6
    Electronic Resource
    Electronic Resource
    Spatial regulation in the expression of structural and regulatory storage-protein genes in Zea mays endosperm (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Developmental Genetics 13 (1992), S. 264-276 
    Details
    ISSN: 0192-253X
    Keywords: Zea mays ; endosperm development ; in situ hybridization ; zein spatial expression ; highlysine mutants ; Opaque-2 transcript localization ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Endosperm development in maize seed involves the multiplication, enlargement, and differentiation of cells with consequent accumulation of storage products. The storage protein genes, encoding zeins, and glutelins (multigene families) are expressed and developmentally regulated by different loci. Wild-type lines and genotypes carrying mutations at loci affecting zein synthesis (o2, o7, fl2, and prol) were characterized at the molecular level and investigated by Northern analysis in order to define the expression of structural and regulatory genes. In situ hybridization in both wild-type and mutant lines was performed to visualize the spatial distribution of transcripts representing each gene family, during endosperm development. The zein and glutelin mRNAs are expressed in all endosperm cells, except for the aleurone layer. However, each mRNA type accumulates at a different level in the various endosperm regions, thus allowing to recognize specific territories of expression for each storage protein mRNA within the tissue. The spatial expression patterns appear early for each gene type and are maintained during the course of endosperm development. Also, the quantitative distribution of the same transcripts in endosperm of mutant lines is specific for each mutant and different from that of the wild-type. Furthermore, the amount of the O2 transcript, present in the nucleus and cytoplasm of wild-type cells, varies substantially in the different o2 mutations considered, in one mutant almost exclusively confined within the nucleus. These data suggest a specific control of the spatial expression of storage protein genes and a heterogeneous molecular composition of protein bodies throughout the endosperm tissue. © 1992 Wiley-Liss, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/dvg.1020130404
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