tryptophan/maís

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Movement of Indole-3-acetic Acid and Tryptophan-derived Indole-3-acetic Acid from the Endosperm to the Shoot of Zea mays L.

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The structures and the concentrations of all of the indolylic compounds that occur in the endosperm of the seeds of corn (Zea mays L.) are known. Thus, it should be possible to determine which, if any, of the indolylic compounds of the endosperm can be transported to the seedling in significant

[Effects of applying L-methionine, L-phenylalanine and L-tryptophan on Zea mays growth and its nutrient uptake].

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A pot experiment was conducted to evaluate the effects of applying L-methionine (L-MET), L-phenylalanine (LPHE) and L-tryptophan (L-TRP) on the growth of Zea mays and its nutrient uptake, and to determine the optimal application rate of them. The results showed that L-MET, L-PHE and L-TRP could

Translocation of Indole-3-acetic Acid-1'-C and Tryptophan-1-C in Seedlings of Phaseolus coccineus L. and Zea mays L.

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Indole-3-acetic acid-1'-(14)C (IAA-(14)C) and tryptophan-1-(14)C injected in small amounts into cotyledons of Phaseolus coccineus L. seedlings were found to be translocated acropetally into the epicotyls and young shoots. Similarly IAA-(14)C was translocated acropetally into coleoptiles of Zea mays

Quaternary Structure of the Tryptophan Synthase α-Subunit Homolog BX1 from Zea mays.

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BX1 from Zea mays (zmBX1) is an enzyme of plant secondary metabolism that generates indole for the synthesis of plant defensins. It is a homologue of the tryptophan synthase α-subunit, TrpA. Whereas TrpA itself is a monomer in solution, zmBX1 is dimeric, confirmed in our work by native MS.

Synechocystis PCC 6803 contains a single gene for the beta subunit of tryptophan synthase with strong homology to the trpB genes of Arabidopsis and maize (Zea mays L.).

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We report the sequence of the trpB gene of the cyanobacterium Synechocystis sp. PCC 6803. This gene was cloned from a plasmid library by functional complementation of a trpB mutant of Escherichia coli K-12. Among the known trpB sequences, the Synechocystis gene bears the greatest homology to the

An in Vitro System of Indole-3-Acetic Acid Formation from Tryptophan in Maize (Zea mays) Coleoptile Extracts.

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The formation of a product from tryptophan that had the same retention time as that of authentic indole-3-acetic acid (IAA) on high performance liquid chromatography was detected in crude extracts of maize (Zea mays) coleoptiles. The product was identified as IAA by mass spectrometry. The

Marker aided introgression of opaque 2 (o2) allele improving lysine and tryptophan in maize ( Zea mays L.)

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Maize is the predominant food source for the world population, but lack of lysine and tryptophan in maize endosperm cannot fulfill the nutritional requirements of humans. Hence, the improvement of lysine and tryptophan content is the ultimate goal of maize biofortification programs. In the present

Performance of commercial laying hens when six percent corn oil is added to the diet at various ages and with different levels of tryptophan and protein.

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Three experiments were conducted to evaluate the use of corn oil in the diet of commercial layers as a method of increasing egg weight. In the first experiment, the performance of commercial layers receiving 6% added corn oil beginning at 18 to 30 wk at 2-wk intervals was evaluated. In the second

Tryptophan synthase in maize (Zea mays L.): I. In vivo & in vitro demonstration of enzyme activity.

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Concentration and Metabolic Turnover of Indoles in Germinating Kernels of Zea mays L.

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The amounts and rates of metabolic turnover of the indolylic compounds in germinating kernels of sweet corn were determined. Knowledge of pool size and rate of pool turnover has permitted: (a) identification of indole-3-acetyl-myo-inositol as the major chemical form for transport of indole-3-acetic

Identification of essential amino acid residues in a sterol 8,7-isomerase from Zea mays reveals functional homology and diversity with the isomerases of animal and fungal origin.

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A putative 8,7SI (sterol 8,7-isomerase) from Zea mays, termed Zm8,7SI, has been isolated from an EST (expressed sequence tag) library and subcloned into the yeast erg2 mutant lacking 8,7SI activity. Zm8,7SI restored endogenous ergosterol synthesis. An in vitro enzymatic assay in the corresponding

Metabolism and Synthesis of Indole-3-Acetic Acid (IAA) in Zea mays (Levels of IAA during Kernel Development and the Use of in Vitro Endosperm Systems for Studying IAA Biosynthesis).

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Kernels of Zea mays on an intact plant accumulate indole-3-acetic acid (IAA) at the rate of 190 ng g-1 fresh weight h-1. Of the IAA synthesized, 97% is in the esterified form and less than 3% remains as the free acid. The site of biosynthesis of the IAA, whether synthesized in the leaf and

Some Physical Characteristics of the Enzymes of l-Tryptophan Biosynthesis in Higher Plants.

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Anthranilate synthetase, phosphoribosyltransferase, phosphoribosyl anthranilate isomerase, and indoleglycerol phosphate synthetase were examined in partially purified extracts of the monocotyledon, Zea mays and the dicotyledon, Pisum sativum. The plant extracts were chromatographed on DEAE-cellulose

Short term diet of precooked corn meal almost lacking in tryptophan and interspecific rat-mouse aggressive behaviour.

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The content of tryptophan in a precooked corn meal and in 4 types of selected corn seeds: Zea mays indurata, identata, opaque/2 and Marano synth., has been determined by three different methods: ion-exchange chromatography, spectrofluorometry and spectrophotometry. This content is very low, less

Accumulation of Brain Tryptophan in Rats after Administering Various Fats or Fatty Acids.

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The intragastric administration of various kinds of fat (corn oil, lard, safflower oil, perilla oil, and fish oil) or fatty acids (oleic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA)) caused a significant increase in brain tryptophan (especially

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