bundle sheath

American  

noun

Botany.

1. a layer of cells in plant leaves and stems that surrounds a vascular bundle.

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bundle sheath Scientific  

1. A layer or region of compactly arranged cells surrounding a vascular bundle in a plant. The bundle sheaths regulate the movement of substances between the vascular tissue and the parenchyma and, in leaves, protect the vascular tissue from exposure to air.

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Example Sentences

However, in C4 sorghum plants, this regulatory element was not only associated with bundle sheath identity genes -- it was also turning on the photosynthesis genes.

From Science Daily • Nov. 20, 2024

In C4 plants, however, the spatial separation of the C4 photosynthesis pathway helps prevent O3 from infiltrating the bundle sheath cells where sugars are made.

From Science Daily • Nov. 13, 2023

In C4 leaves, mesophyll cells radiate out around bundle sheath cells like spokes on a wheel, whereas in C3 leaves they are stacked on top of one another in a flat arrangement.

From Nature • Apr. 25, 2017

Instead of using rubisco, bundle sheath cells in this ring use the enzyme phosphoenolpyruvate carboxylase, which doesn't bind oxygen, to capture CO2 in a four-carbon compound.

From Nature • Apr. 25, 2017

The stem is traversed by a central fibro-vascular cylinder that separates easily from the surrounding tissue, owing to the rupture of the cells of the bundle sheath, this being particularly frequent in dried specimens.

From Elements of Structural and Systematic Botany For High Schools and Elementary College Courses by Campbell, Douglas Houghton