The Effect of Mineral Nutrient Deficiency on the Content of free Amino Acids in Setaria Sphacelata

Court, RD; Williams, W. T.; Hegarty, M. P.

doi:10.1071/bi9720077

Cited by 6 publications

References 5 publications

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Effects of nitrogen and phosphorus fertilisers on yield and on inorganic and organic composition of italian ryegrass grown on phosphorus‐deficient soil

1977

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Italian ryegrass (Lolium rnultiflorum) S22, grown in a greenhouse in phosphorusdeficient soil in pots was given 40 and 160 mg N/kg of soil (as ammonium nitrate) and 5, 25 and 100mgP/kg of soil (as calcium tetrahydrogen diorthophosphate). Giving more nitrogen increased yields only when adequate phosphorus was applied. A significant response to added phosphorus was obtained when ryegrass dry matter contained about 0.15 % P or less. Nitrogen increased the amount of sugars but decreased that of fructosan. Phosphorus increased the production of both sugars and fructosan. Protein N (expressed as a percentage of total N) increased with increasing amounts of phosphorus given. The largest values for protein N were obtained when grass contained about 0.3 % Pin the dry matter. In phosphorus-deficient grass nitrate-N accumulated and the predominant compounds within the free amino acid fraction were asparagine and glutamine. Adding phosphorus decreased the concentrations of both nitrate-N and the amides. The amino acid composition of the grass protein was not affected by the nitrogen and phosphorus treatments.

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Effects of nitrogen and phosphorus fertilisers on yield and on inorganic and organic composition of italian ryegrass grown on phosphorus‐deficient soil

1977

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The abundance of invertebrate herbivores in relation to the availability of nitrogen in stressed food plants

1984

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It has previously been postulated that when plants are stressed by certain changes in patterns of weather they become a better source of food for invertebrate herbivores because this stress causes an increase in the amount of nitrogen available in their tissues for young herbivores feeding on them. And this may cause outbreaks of such phytophagous invertebrates.Evidence is now presented that a similar physiological mechanism appears to operate when a wide variety of apparently unrelated environmental factors impinge on plants or parts of plants in such a way as to perturb their metabolism. A broken branch, lightning strike, fire, nutrient deficiencies or an otherwise adverse site; all may have this effect. With the advent of modern man the available agencies increase and diversify to include pesticides, irradiation and air pollutants.One common metabolic response by plants to all such agents impinging on them seems to be equivalent to that found in senescing plant tissues - the breakdown and mobilization of nitrogen in soluble form away from the senescing/stressed tissues. Young herbivores which chance to feed on such stressed/senescing tissues have a greater and more readily available supply of nitrogen in their food than they would have had if feeding on unstressed plants. As a result many more of them survive, and there is an increase in abundance of their kind. Such increases may be quite localised and short-lived or more widespread and persistent, depending on the extent and duration of the stress experienced by the plants. And in the face of this improved nutrition and survival of the very young, predators and parasites seem to have only a minor influence on subsequent changes in abundance of their herbivorous prey.Another effect of increased mobilization of nitrogen in stressed plants is an increase in the quantity of the seed that they set. This has led to the conclusion that increased abundance of some species of birds at such times is due to a greater supply of seeds as winter food for recent fledglings. But it may be that the increased abundance is due to the synchronous increase in phytophagous insects providing a richer source of protein food for laying hens and growing nestlings.

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Some aspects of relation between nitrogen metabolism inPisum sativum and mineral nutrition

Klein

Jäger

1978

Plant Soil

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The Effect of Mineral Nutrient Deficiency on the Content of free Amino Acids in Setaria Sphacelata

Cited by 6 publications

References 5 publications

Effects of nitrogen and phosphorus fertilisers on yield and on inorganic and organic composition of italian ryegrass grown on phosphorus‐deficient soil

Effects of nitrogen and phosphorus fertilisers on yield and on inorganic and organic composition of italian ryegrass grown on phosphorus‐deficient soil

The abundance of invertebrate herbivores in relation to the availability of nitrogen in stressed food plants

Some aspects of relation between nitrogen metabolism inPisum sativum and mineral nutrition

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