chloroplast

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chloroplast

 [klor´o-plast]
the photosynthetic unit of a plant cell, containing all the chlorophyll.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

chlor·o·plast

(klōr'ō-plast),
A plant cell inclusion body containing chlorophyll; occurs in cells of leaves and young stems. Site of photosynthesis in higher plants.
[chloro- + G. plastos, formed]
Farlex Partner Medical Dictionary © Farlex 2012
Chloroplastclick for a larger image
Fig. 101 Chloroplast . (a) Thin section through a whole chloroplast. (b) Thylakoid arrangement. (c) An enlarged section of a granum.

chloroplast

a type of PLASTID containing CHLOROPHYLL found within the cells of plant leaves and stems. The chlorophyll is packed within granules called quantasomes which are located in the walls of flattened sacs called LAMELLAE or thylakoids. The lamellae lie closely together in certain areas to form grana and are more separate in the intergranal regions. LIGHT REACTIONS of photosynthesis are thought to take place in the quantasomes while DARK REACTIONS occur in the watery matrix surrounding the lamellae, the stroma.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Mizrachi found she could reliably predict - just by the initial reactions of the chloroplasts to the ROS signals - which cells would be dead a day later.
However, in a stressful environment, chloroplasts send an alarm back to the cell nucleus using retrograde signalling (creating a chloroplast-to-nucleus communication feedback loop).
After further analysis, the team unexpectedly found that GUN1 partners with another protein, MORF2 (an essential component of the plant RNA editing complex), to affect the efficiency of RNA editing during chloroplast-to-nucleus communication in damaged chloroplasts. Greater activity of MORF2 led to widespread editing changes as well as defects in chloroplast and leaf development even under normal growth conditions (see image).
crispata "clarki" ecotype has been investigated (Curtis et al., 2006, 2007; Pierce et al., 2006; Christa et al., 2014; Middlebrooks et al., 2014), the algal sources of the symbiotic chloroplasts in the E.
The endosymbiosis hypothesis was first proposed in the 1960s by biologist Lynn Margulis, who believed that organelles such as chloroplasts and mitochondria, the energy-producing organelles in all eukaryotic organisms, were originally free-living organisms that were conscripted into the bodies of larger cells.
With those two enzymes in balance, a chloroplast can still rid itself of excess energy but get back to full operations faster.
Research carried out by a team at the University of Essex confirmed that iridoplasts performed better at photosynthesis than normal chloroplasts in very low light levels.
In C3 plants, CO2 fixation and reduction via the Calvin cycle operates in the chloroplasts of mesophyll cells (MC), and the NADPH required for CO2 reduction also comes from MC.