The role of iron in higher plant chlorophyll biosynthesis, maintenance and chloroplast biogenesis

Pushnik, James C.; Miller, Gene W.; Manwaring, J. H.

doi:10.1080/01904168409363238

Cited by 79 publications

(30 citation statements)

References 46 publications

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“…The essential role of iron in chlorophyll biosynthesis (Pushnik et al 1984) was demonstrated by similar reductions in chl a for both NO 3-and NH4-grown cultures under iron depletion (Tables 1 and 2). The chlorotic nature of iron-deficient cells has been noted in other reports on iron-stressed phytoplankton (e.g.…”

Section: T Weissflogiimentioning

confidence: 50%

Aspects of iron and nitrogen nutrition in the red tide dinoflagellateGymnodinium sanguineum

Doucette

Harrison

1991

Mar. Biol.

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Abstract. Iron-stress-mediated effects on biochemical constituents of the red tide dinoflagellate Gymnodinium sanguineurn Hirasaka were examined in 1988 by comparing Fe-replete and Fe-deplete batch cultures. The influence of nitrogen source (NO 3 or NH4) on characteristics of Fe-deplete cells was also studied [i.e., Fe-deplete/NO 3-grown (= -Fe/NO3) vs Fe-deplete/NH4-grown (= -Fe/ NH4) ]. Common to both N sources were reductions of chlorophyll a (chl a) and Fe quotas (per cell volume) by 75% and ca.

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Section: T Weissflogiimentioning

confidence: 50%

Aspects of iron and nitrogen nutrition in the red tide dinoflagellateGymnodinium sanguineum

Doucette

Harrison

1991

Mar. Biol.

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“…Although iron is not present in the chlorophyll molecule, it controls the rate of δ-aminolevulinic acid (ALA) synthesis and is also required for the formation of protochlorophyllide from Mg-protoporphyrin (Miller et al, 1995;Pushnik et al, 1984). Iron is also essential in the synthesis of proteins required for the development of the lamellae structure of chloroplasts (Abadía et al, 1989a).…”

Section: Functions Of Iron In Plant Metabolismmentioning

confidence: 99%

Lime-Induced Iron Chlorosis in Fruit Trees

Pestana

Faria

Varennes³

2004

Production Practices and Quality Assessment of Food Crops

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“…N~trate-grown cells of a dinoflagellate also exhibited higher in vivo f1:chl a compared to ammonium-grown cells under Fe-stress (Doucette & Harrison 1991). Nitrogen limitation can also increase in vivo f l : chl a (Kiefer 1973, Sakshaug & Holm-Hansen 1977, as nitrogen is required as well a s Fe for the synthesis of cytochromes (Pushnik et al 1984). The nitrate concentration in the medium at the time of harvesting the Fe-stressed cells was >30 pM nitrate ( > l 0 pM ammonium for ammonium-grown cultures).…”

Section: Fe and Chlorophyll Carbon Nitrogenmentioning

confidence: 99%

Effects of iron and nitrogen source on the sinking rate, physiology and metal composition of an oceanic diatom from the subarctic Pacific

Dl¹,

Lecourt²,

Pj³

1996

Mar. Ecol. Prog. Ser.

106

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The effect of iron (Fe) on the sinking rate of a n oceanic diatom Actinocyclus sp. and an oceanic coccolithophore Emiliania huxleyi, both isolated from the subarctic Pacific, was examined in natural oceanic seawater. The Fe status of the diatom had a dramatic effect on its sinking rate, causing a 5 times increase from 0.17 to 0.93 m d-' from Fe-replete to Fe-stressed conditions. In contrast, Fe had no effect on the sinking rate of the oceanic coccolithophore, whlch maintained its sinking rate at 0.12 m d-' The cell volume of the d~a t o m decreased slightly under Fe-stressed conditions, but the cell volume of the coccolithophore decreased substantially (4tiC%) under Fe-stressed conditions. The effect of nitrogen source (nitrate vs a m m o n~u m ) on the chlorophyll a (chl a), carbon ( C ) , and nitrogen ( N ) quotas of the oceanic dlatom Act~nocyclus sp. was also examined. Under Fe-stressed conditions when the energystress on the cells is the greatest, ammoni.urn-grown cells appeared to have a physiological advantage over nitrate-grown cells In this oceanic diatom. Ammonium-grown cells were able to maintain normal N and C quotas under Fe-stress, whereas nitrate-grown cells were not, resulting in an 80% reduction In N cell-' for nltrate grown cells under FP-stress. Also, In vlvo f1uo1-escence:chl a increased and chl a C decreased more drastically for nitrate-grown cells under Fc-stress than for ammonium-grown cells, indicating that nitrate-grown cells under Fe-stress are less capable of trapping and utilizing light energy. These findings support theoretical predictions based on Fe and energy requirements for nitrate versus ammonium utilization. Metal quotas (Fe, Mn, Zn) were measured simultaneously using cold-metal techniques to determine the metal content of the cells. There were no significant differences in metal to carbon ratios between nitrate and ammonium-grown cells under Fe-replete conditions. Under Festressed conditions, nitrate-grown cells had significantly higher Mn:C and significantly lower Zn:C ratios than ammonium-grown cells, but there was no observed difference in Fe quotas. In this study we observed that 2 different species of phytoplankton from the subarctic Pacific responded physiologically differently to s~milar Fe conditions. Our results suggest that the sol~tary, centric, 20 to 60 pm diameter oceanlc dlatorn would have a higher sinking rate than the oceanlc coccolithophore in the subarct~c Pacific, perhaps havlng implications for biogenic fluxes to depth. Moreover, our data indicate that thls diatom is probably utll~zing ammonium to mcet its nltrogen requlrements in situ under the low Fe conditlons found In the northeast subarctic Pacific. A c~~~~o c~c~u s s~.appears incapable of effectively chang111g its cell volume to help alleviate Fe-(and other nutnent) stress, whereas the coccolithophore can reduce ~t s cell volume substantially, allowing it to reduce its requlrements for N, C, and Fe. These physiological results help to explain phytoplankton c o m p o s~t~o n dynamics in the ...

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The role of iron in higher plant chlorophyll biosynthesis, maintenance and chloroplast biogenesis

Cited by 79 publications

References 46 publications

Aspects of iron and nitrogen nutrition in the red tide dinoflagellateGymnodinium sanguineum

Aspects of iron and nitrogen nutrition in the red tide dinoflagellateGymnodinium sanguineum

Lime-Induced Iron Chlorosis in Fruit Trees

Effects of iron and nitrogen source on the sinking rate, physiology and metal composition of an oceanic diatom from the subarctic Pacific

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