The ultrastructural development of plastids in leaves of maize plants exposed to continuous illumination

Rascio, Nicoletta; Colombo, P. Mariani; Orsenigo, M.

doi:10.1007/bf01276953

Cited by 27 publications

(15 citation statements)

References 5 publications

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“…Both BS and M express SS enzymes (Spilatro and Preiss, 1987;Majeran and van Wijk, 2009) and synthesize starch (Rascio et al, 1980;Kanai and Edwards, 1999), so SS was allocated to BS between zero and total SS rate. PR is not essential to BS, so minimum PR was set at zero.…”

Section: Minimum and Maximum Bs Allocationmentioning

confidence: 99%

The Operation of Two Decarboxylases, Transamination, and Partitioning of C4 Metabolic Processes between Mesophyll and Bundle Sheath Cells Allows Light Capture To Be Balanced for the Maize C4 Pathway

2013

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The C 4 photosynthesis carbon-concentrating mechanism in maize (Zea mays) has two CO 2 delivery pathways to the bundle sheath (BS; via malate or aspartate), and rates of phosphoglyceric acid reduction, starch synthesis, and phosphoenolpyruvate regeneration also vary between BS and mesophyll (M) cells. The theoretical partitioning of ATP supply between M and BS cells was derived for these metabolic activities from simulated profiles of light penetration across a leaf, with a potential 3-fold difference in the fraction of ATP produced in the BS relative to M (from 0.29 to 0.96). A steady-state metabolic model was tested using varying light quality to differentially stimulate M or BS photosystems. CO 2 uptake, ATP production rate (J ATP ; derived with a low oxygen/chlorophyll fluorescence method), and carbon isotope discrimination were measured on plants under a low light intensity, which is considered to affect C 4 operating efficiency. The light quality treatments did not change the empirical ATP cost of gross CO 2 assimilation (J ATP /GA). Using the metabolic model, measured J ATP /GA was compared with the predicted ATP demand as metabolic functions were varied between M and BS. Transamination and the two decarboxylase systems (NADP-malic enzyme and phosphoenolpyruvate carboxykinase) were critical for matching ATP and reduced NADP demand in BS and M when light capture was varied under contrasting light qualities.

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Section: Minimum and Maximum Bs Allocationmentioning

confidence: 99%

The Operation of Two Decarboxylases, Transamination, and Partitioning of C4 Metabolic Processes between Mesophyll and Bundle Sheath Cells Allows Light Capture To Be Balanced for the Maize C4 Pathway

2013

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“…A transient appearance and disappearance of prolamellar bodies, according to the prevailing light intensity, seems to be a normal feature in developing chloroplasts of leaves (Kirk and Tilney-Bassett, 1978). However, Rascio, Colombo and Orsenigo (1980) considered that in maize plants subjected to continuous illumination, the presence of prolamellar bodies does not represent a plastid stage affected by light, but a normal stage of chloroplast ontogenesis. According to these authors, prolamellar body formation and dispersal is under direct control of the metabolic status of the cytoplasm.…”

Section: Discussionmentioning

confidence: 99%

THE DEVELOPMENT OF CHLOROPLASTS IN ROOT MERISTEMATIC TISSUE OF SECALE CEREALE L. SEEDLINGS

Oliveira¹

1982

New Phytologist

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SUMMARY Proplastids of the meristematic region of roots of rye, Secale cereale, seedlings can be induced to develop into chloroplasts after a lengthy period of continuous exposure to light. The transformation involves the formation of prolamellar bodies which eventually become the source of membrane material for the organization of granal and intergranal thylakoids. The process is also accompanied by a two‐step increase in the number of plastidial ribosomes which coincides with the extension of the intraplastidial membrane system and by a progressive accumulation of photosynthetic pigments and development of Hill reaction activity. Overall mature chloroplasts of root meristematic tissue compare well both structurally and functionally with those from the leaves of the same plant.

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“…Chloroplasts from C. japonica have much less organized thylakoids than those of such autotrophic higher plants as E/odea (M~hlethaler and Frey-Wyssling, 1959), Zea (Rascio et al, 1980;Gunning and Steer, 1996), Gossypium (Pe~Ligrew and Vaughn, 1998), and Nicotiana (Staehelin, 2003). Though their thylakoids are poorly organized into grana stacks, the C. japonica chloroplasts are capable of photosynthesis, thereby enabling seedlings to grow autotrophically.…”

Section: Plastidsmentioning

confidence: 96%

Ultrastructure and development of seedlings of the parasitic weedCuscuta japonica

Lee

2007

J. Plant Biol.

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Shoot subapical cells in the parasitic angiosperm Cuscuta japonica seedlings were ultrastructurally studied. Seedlings were grown for 3 d in the dark and then for an additional 3 d in sunlight. Under either lype of illumination, most cells in the primary meristem contained several vacuoles with or without electron-dense particles. These vacuoles were believed to be derived from degraded protein bodies with globoid crystals that were stored in the embryos. As growth progressed, the reserves were gradually depleted, while various cell organelles increased. This indicated that those storage reserves were utilized for seedling development and that, concurrently, cellular metabolism in the seedling cells converted from a quiescent to an active state. When seedlings were exposed to sunlight, etioplasts with prolamellar bodies developed into chloroplasts possessing thylakoids that were well-organized into grana. These observations suggest that C. japonica seedlings might exist autotmphically and photosynthesize during a free-living stage prior to parasitizing their hosts.

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The ultrastructural development of plastids in leaves of maize plants exposed to continuous illumination

Cited by 27 publications

References 5 publications

The Operation of Two Decarboxylases, Transamination, and Partitioning of C4 Metabolic Processes between Mesophyll and Bundle Sheath Cells Allows Light Capture To Be Balanced for the Maize C4 Pathway

The Operation of Two Decarboxylases, Transamination, and Partitioning of C4 Metabolic Processes between Mesophyll and Bundle Sheath Cells Allows Light Capture To Be Balanced for the Maize C4 Pathway

THE DEVELOPMENT OF CHLOROPLASTS IN ROOT MERISTEMATIC TISSUE OF SECALE CEREALE L. SEEDLINGS

Ultrastructure and development of seedlings of the parasitic weedCuscuta japonica

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