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pyrenoid
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pyrenoid
A Dictionary of Plant Sciences
pyrenoid A region of starch formation found in the
chloroplasts of various
algae (e.g.
Spirogyra and
Chlamydomonas).
Find more facts and information related to the .
© A Dictionary of Plant Sciences 1998, originally published by Oxford University Press 1998.
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Hanging on to the green stuff. (chloroplast retention by planktonic ciliates)
; ...they ingest and use them to their own advantage. Chloroplasts are the chlorophyll storage areas where photosynthesis and starch formation take place in plants. Diane K. Stoecker, Ann E. Michaels and Linda H. Davisdetermined the number of these planktonic ciliates...
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Inhibition of enzymic digestion of amylose by free fatty acids in vitro contributes to resistant starch formation
; ABSTRACT The effect of lipids on the enzymic breakdown of starch was investigated using an in vitro assay system. Mixtures of potato amylose, amylopectin and starch and various lipids were incubated at 37 deg C for 10 min and subjected to digestion by a-amylase (EC 3.2.1.1) and amyloglucosidase (EC
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Solid link between test weight, yield dispelled
; ...something else that cuts off grain fill quickly, corn usually has both low test weights and low yields. That's because starch formation stops quickly, so kernel or endosperm density ends up being low. Low kernel density usually means low test weight -- sort...
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Mutational analysis of the pullulanase-type debranching enzyme of maize indicates multiple functions in starch metabolism
; ...in linear maltooligosaccharides, indicating that the pullulanase-type DBE functions in glucan hydrolysis during kernel starch formation. Furthermore, in a background deficient in isoamylase-type DBE, zpu1-204 conditions a significant accumulation of phytoglycogen...
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Soil fertility basics. (The garden).
; ...quantities than any other nutrient, except perhaps nitrogen. It is vital in numerous plant functions including protein and starch formation, cell division, photosynthesis, cellular structure of stalks, and disease resistance. Most soils contain high levels of...
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Isolation and Characterization of Mutants of Common Ice Plant Deficient in Crassulacean Acid Metabolism1[W][OA]
; ...mutants were deficient in leaf starch and lacked plastidic phosphoglucomutase, an enzyme critical for gluconeogenesis and starch formation, resulting in substrate limitation of nocturnal C^sub 4^ acid formation. The restoration of nocturnal acidification by...
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Characterization of a granule-bound starch synthase isoform found in the pericarp of wheat
; ...Greenwood, 1970), and it appears that GBSSI plays little or no role in amylose synthesis in nonstorage tissues. In a review of starch formation in the vegetative organs of rice, starches were classified as either permanent (storage) or temporary (Sato, 1984). Temporary...
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Incompatibility systems in switchgrass. (Crop Breeding, Genetics & Cytology).
; ...crossed spikelets, they found that most of the seed was shriveled with a liquid endosperm and lacked starch or had sparse starch formation. Norrmann et al. (1994) concluded that the low diploid-tetraploid crossability was due to the existence of a postzygotic...
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Phosphorylation of the Amino Terminus of Maize Sucrose Synthase in Relation to Membrane Association and Enzyme Activity1
; ...the importance of its Suc cleavage activity is evidenced by SUS mutants that show reductions in cellulose, callose, and starch formation (Chourey et al., 1998; Sturm and Tang, 1999; Subbaiah and Sachs, 2001). The soluble SUS (s-SUS) enzyme has traditionally...
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Cross-linked resistant starch: Preparation and properties
; ...starch. I. Quantitative and qualitative influence of incubation time and temperature of autoclaved starch on resistant starch formation. Cereal Chem. 70:339-344. Englyst, H. N., Kingman, S. M., and Cummings, J. H. 1992. Classification and measurement of nutritionally...
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Related entries from encyclopedias, dictionaries, and thesauruses
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pyrenoid
pyrenoid A spherical protein body found in the chloroplasts of many algae and the hornworts (see Anthocerophyta ). Pyrenoids are associated with the storage of starch: layers of starch are often found around them.
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pyrenoid
see chloroplast .
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Anthocerophyta
...longitudinally to release the spores. Hornwort cells each contain a single chloroplast inside which, uniquely among plants, is a pyrenoid , associated with starch production. Some species have separate male and female plants, while others have both types of sexual...
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chloroplast
...pigments. Chloroplasts are thus the central site of the photosynthetic process in plants. The chloroplasts of algae are simpler than those of higher plants and may contain special, often conspicuous, starch-accumulating structures called pyrenoids.
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