Sweet pea stem, light micrograph

Sweet pea stem, light micrograph

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Caption: Sweet pea stem. Light micrograph of a transverse section through the stem of a perennial sweet pea (Salicornia europaea) plant. The stem has evolved two green wings (left and right) to increase photosynthesis. These wings contain spongy mesophyll (pink), similar to a leaf, and several small vascular bundles (dark spots). The main stem has a ring of collateral vascular bundles (dark pink blobs) each with an outer layer of supporting fibres (sclerenchyma, green-orange-blue). Under this are phloem sieve tubes (pink), metaxylem (large vessels, brownish-red), and protoxylem (small vessels, pink). Most of the pith parenchyma has broken down leaving a hollow stem (white, centre). Magnification: x14 when printed 10 centimetres wide.

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Keywords: angiosperm, angiosperms, biological, biology, botanical, botany, bundles, cell, cell biology, cells, cortex, cytology, epidermis, fibres, flora, lathyrus latifolius, light micrograph, light microscope, lm, metaxylem, nature, parenchyma, perennial pea, perennial peavine, phloem, pith, plant, plant structure, protoxylem, sclerenchyma, section, sectioned, spongy mesophyll, stem, support, supporting fibre, supportive, sweet pea, vascular bundle, white background, xylem

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