Morphometric Analysis of Chloroplasts of Cotton Leaf and Fruiting Organs |
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Authors: | BR Bondada DM Oosterhuis |
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Institution: | (1) Soil and Water Sciences, University of Florida, 2169 McCarty Hall, P.O. Box 110290, Fayetteville, FL 32611, USA;(2) Department of Crops, Soils, and Environmental Sciences, University of Arkansas, 1366 Altheimer Drive, Altheimer Laboratory, Fayetteville, AR 72704, USA |
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Abstract: | We examined morphological and ultrastructural differences in chloroplasts of cotton leaves and the fruiting organs, bract,
and capsule wall to advance our understanding of their commonly observed differences in photosynthetic efficiency. Chloroplasts
from leaves were large (7.1 μm long in cross section), lens shaped with a well developed membrane system differentiated into
grana and stroma lamellae that occupied the large cross-sectional area (12.3 μm2) of the organelle. A few small plastoglobuli and starch grains were scattered in the stroma region. The bract chloroplasts
were correlative of leaf chloroplasts in size (6.8 μm in length) and shape with the exception that the bract chloroplasts
exhibited greater thylakoid number per granum (15.8) than the leaf chloroplasts (10.5). In contrast to leaf and bract, the
capsule wall chloroplasts were smaller in size (4.3 μm) and cross sectional area (6.8 μm2) than either the leaf or bract. The most intriguing feature of the capsule wall chloroplasts was its domination by large
starch granules (5.3 μm2) in the stroma which filled the whole chloroplast coercing the membrane system to move towards the periphery of the organelle.
Grana number and thylakoids per granum were lowest in the capsule wall chloroplasts.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | bract capsule wall Gossypium hirsutum grana starch thylakoids transmission electron microscopy |
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