Spongy Mesophyll
Spongy Mesophyll - Related Videos
01:09
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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone). Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
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Scalable Transfection of Maize Mesophyll Protoplasts
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Here, we present a high-throughput protocol to transiently transfect millions of maize protoplasts for testing large libraries of plasmids in maize mesophyll cells.
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Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy. C4 Pathway The C4 pathway is used by plants such as...
01:07
Anatomy of Chloroplasts
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Green algae and plants, including green stems and unripe fruit, harbor chloroplasts—the vital organelles where photosynthesis takes place. In plants, the highest density of chloroplasts is found in the mesophyll cells of leaves. A double membrane surrounds chloroplasts. The outer membrane faces the cytoplasm of the plant cell on one side and the intermembrane space of the chloroplast on the other. The inner membrane separates the narrow intermembrane space from the aqueous interior of the...
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FAQs
The key structural feature is the network of interconnected air spaces created by its irregular cells. These spaces provide internal routes for diffusion, so gases do not have to move only through densely packed cellular material. As a result, carbon dioxide can reach photosynthetic cells, while oxygen and water vapor can move toward stomata.
Although gas transport is its primary role, many spongy mesophyll cells contain chloroplasts. These organelles allow the cells to capture light and produce sugars, linking internal diffusion with photosynthetic output. The tissue therefore contributes to photosynthesis in two connected ways: it supports gas movement and also contains cells capable of light capture.
Spongy mesophyll differs from palisade mesophyll mainly in cellular packing and associated function. Palisade mesophyll is compact, whereas spongy mesophyll has irregular cells and connected air spaces. This contrast creates complementary leaf regions: one is associated with compact organization, while the other provides an internal pathway that supports gas exchange beneath it.
Stomata provide the leaf openings toward which water vapor and oxygen move after passing through the internal air spaces. Carbon dioxide travels in the opposite direction, entering through these openings and diffusing inward. This directional exchange connects internal leaf structure with the external atmosphere and allows the tissue to participate in continuous gas movement.
Examining this tissue helps connect leaf anatomy with gas exchange, photosynthetic performance, and transpiration. Because its structure mediates movement of carbon dioxide, oxygen, and water vapor, studying it helps explain how efficiently a leaf exchanges gases and supports sugar production. It therefore provides anatomical context for interpreting overall photosynthetic function.
Its role in internal gas transport makes spongy mesophyll part of the anatomical context for interpreting environmental responses. Studying the tissue can help explain how leaf gas exchange, photosynthetic performance, and transpiration relate to drought or limited carbon dioxide. This perspective connects environmental conditions with leaf structure rather than treating photosynthesis as an isolated process.