By R. M. Wallsgrove (editor)
Crops convert inorganic nitrogen into amino acids, the development blocks for proteins. in addition they make quite a lot of different nitrogen compounds to aid guard themselves from pests and illnesses. An realizing of those compounds can for that reason assist in devising higher crop safety and construction equipment. This quantity comprises essays via scientists who've studied facets of plant nitrogen meals and amino acid biosynthesis. There are chapters on protein amino acids, nonprotein amino acids, betaines, glutathione, polyamines, and different secondary metabolites derived from amino acids. the result of those experiences should be of curiosity to graduate scholars and execs in biochemistry and botany.
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Extra info for Amino Acids and their Derivatives in Higher Plants (Society for Experimental Biology Seminar Series (No. 56))
1. The aspartate-derived amino acid biosynthetic pathway and its main regulatory steps. Feedback inhibition: ( - ) ; feedback activation: (+); repression/induction: . Genetics of the aspartate pathway 31 induction and repression of enzyme synthesis by pathway products and feedback inhibition play a role in the regulation (Datta, 1969), the major method of regulation of the pathway in plants appears to be feedback inhibition at the level of the key enzymes, aspartate kinase (AK), the first enzyme of the pathway, dihydrodipicolinate synthase (DHDPS), the first enzyme of the lysine branch, and homoserine dehydrogenase (HSDH), the first enzyme of the branch leading to threonine and methionine.
1987). Furthermore, its expression is enhanced when the roots are fed with nitrate or ammonium ions, Interactions of N and C metabolism 21 the effect of the latter seeming to be more pronounced. In all conditions tried so far, CP46 is not expressed in roots. CP 21 is expressed in roots and leaves. In leaves, there is a slight induction by light but compared to CP46, this effect is negligible. , 1992). In leaves, the influence of nitrogen source on CP21 expression is not obvious. Therefore, the expression of this gene is controlled by the nitrogen source mainly in roots.
The resistance to AEC in the mutant RAEC-1 was inherited as a monogenic, dominant and nuclear trait. Enzymatic analysis revealed clearly that DHDPS was totally desensitized to the lysine feedback inhibition in the homozygous plant (Fig. 2). However, mutants characterized by high levels of free lysine (more than 20% of the total free amino acid content) were associated with an aberrant phenotype, resulting in reduced leaf blade size, absence of apical dominance, and sterility. Free lysine accumulation in seeds was not observed.