Pollutants Generated in Greenhouses During Co2 Enrichment

Mansfield, T.A.; Murray, A. J. S.

doi:10.17660/actahortic.1984.162.17

Cited by 2 publications

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“…Conditions around the root may also determine the response of a plant to NO and NO2 (Anderson & Mansfield, 1979;Mansfield & Murray, 1984). Normally, roots provide all the N requirements of the shoots and any changes in the metabolism of nitrate by roots in response to NO and NO2 is likely to determine the overall N balance of plants.…”

Section: Root Physiologymentioning

confidence: 99%

“…Law and Mansfield (1982) calculated that the input of N as NO from a 66 kW kerosene burner into a glasshouse with a floor area of 0.05 ha may amount to over 100 kg ha~^ in a growing season of 100 d. Theoretically, such a burner could fulfil virtually all the N requirement of a tomato crop. In practice, glasshouse crops seem to have a limited capacity to utilize N from NO since a supply of NO cannot compensate for the reduction in yield due to a deficiency of soil N (Mansfield & Murray, 1984; see also Fig. 1).…”

Section: Cycling Partitioning and Elimination Of No^-derived Nmentioning

confidence: 99%

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Tansley Review No. 24 Why are atmospheric oxides of nitrogen usually phytotoxic and not alternative fertilizers?

1990

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SUMMARY Atmospheric pollution by the oxides of nitrogen, NO and NO2, can cause reductions in growth but rarely visible injury. This review considers their uptake into foliage, as well as their subsequent metabolism and physiology, and attempts to explain why these gases are often phytotoxic. The combined stresses of resisting cellular acidification, enhanced levels of nitrite (and ammonia), and the direct interference of the free radical ('N=O) with critical enzymes, reaction centres and regulatory mechanisms are thought to be the main reasons why oxides of nitrogen, especially NO, inhibit growth. If other air pollutants such as SO2 are also present with NO or NO2 then free radical‐induced injury, similar to that caused by O3 alone, also occurs.

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Section: Root Physiologymentioning

confidence: 99%

Section: Cycling Partitioning and Elimination Of No^-derived Nmentioning

confidence: 99%

Tansley Review No. 24 Why are atmospheric oxides of nitrogen usually phytotoxic and not alternative fertilizers?

1990

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STUDIES OF NITRATE REDUCTASE ACTIVITY AND IN VIVO NITRATE REDUCTION IN BARLEY LEAVES FOLLOWING INFECTION BY ERYSIPHE GRAMINIS HORDEI

Murray

Ayres

1986

New Phytologist

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SUMMARYEffects of mildew on nitrate reductase (NaR) in leaves of barley were investigated throughout the second dark period and into the third photoperiod after inoculation using both in vivo and in vitro assays of the enzyme activity. Initially, infection depressed NaR activity, but as the dark period progressed the depression disappeared, only to reappear in the following photoperiod.An altered flux of nitrate from the roots was not responsible for decreased NaR activity, since infection stimulated this flux 2 d after inoculation. Similarly, a comparison of activities measured using an in vivo assay, with and without added nitrate, showed that the supply of the other substrate, NADH, was not limiting the rate of reduction.Although NaR activity was depressed during the second and third photoperiods, the rate of in vivo nitrate reduction, calculated from the difference between the flux of nitrate delivered to the leaves and the nitrate content of the leaves, was stimulated by infection over the initial 2 d after inoculation. Consequently, inferences made elsewhere which concern effects of mildew infection on nitrate metabolism, and which depend solely on measurements of NaR activity, may be unwarranted because even the infected plant contains an excess of active NaR.

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Pollutants Generated in Greenhouses During Co2 Enrichment

Cited by 2 publications

References 0 publications

Tansley Review No. 24 Why are atmospheric oxides of nitrogen usually phytotoxic and not alternative fertilizers?

Tansley Review No. 24 Why are atmospheric oxides of nitrogen usually phytotoxic and not alternative fertilizers?

STUDIES OF NITRATE REDUCTASE ACTIVITY AND IN VIVO NITRATE REDUCTION IN BARLEY LEAVES FOLLOWING INFECTION BY ERYSIPHE GRAMINIS HORDEI

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