Both are mesophyll tissues. Both types of cells have chloroplasts and appear in green colour. Together with the palisade, the spongy layer makes up the mesophyll of the leaf. Spongy cells of the leaf are loosely packed together and lie between the palisade and the lower epidermis with the air spaces connected to each other and the outside by stomata. Spongy tissue is a type of tissue found both in plants and animals. CONTENTS. A layer of cells in the interior of leaves, consisting of loosely arranged, irregularly shaped cells that have chloroplasts. Palisade and spongy mesophyll cells are sub-tissues that have different morphologies and physiologies. This is a single layer of cells found directly below the cuticle. Gases dissolve in this water as they move into and out of the cells. Mesophyll is a major tissue for photosynthesis, and contributes about 80% of total RNA from leaves. spongy mesophyll is the air spaces in a plant that allow air to diffuse among the cells which are producing and releasing both CO2 and O2. The ground tissue system, the mesophyll, is divided into two regions: the palisade parenchyma, located beneath the upper epidermis and composed of columnar cells oriented perpendicular to the leaf surface, and spongy parenchyma, located in the lower part of the leaf and composed of irregularly shaped cells. The spongy mesophyll with 2-4 layers consists of isodiametric parenchymatous cells with few intercellular spaces. They are palisade parenchyma and spongy parenchyma. In plants, it is part of the mesophyll, where it forms a layer next to the palisade cells in the leaf. The spongy mesophyll cells are less likely to go through photosynthesis than those in the palisade mesophyll. Mesophyll is the internal ground tissue located between the two epidermal cell layers of the leaf; and is composed of two kinds of tissues: the palisade parenchyma, an upper layer of elongated chlorenchyma cells containing large amounts of chloroplasts; and the spongy parenchyma, a lower layer of spherical or ovoid cells with few chloroplasts and very prominent intercellular air spaces (Fig. spongy mesophyll In a leaf, mesophyll tissue comprising cells of irregular shape, some of them lobed, separated by large spaces in which the atmosphere is humid. It lies just below the palisade layer. Overview and Key Difference 2. The spaces between cells create a larger surface area. The important functions of the spongy mesophyll are: The presence of chloroplast in the spongy mesophyll tissue also helps in performing the photosynthesis. 1. ; In Nymphaea plant sclereids which give mechanical support to the spongy tissue and secretory cells are also found in these cells. Spongy mesophyll cells are a type of parenchyma cells which is a part of the mesophyll tissue or ground tissue present below the epidermis of leaves in plants. Also called spongy mesophyll See more at photosynthesis. ; In xerophytic plants these cells stores water and food in the soluble forms. Thus, determining the palisade and spongy mesophyll-specific transcription factors from the respective sub-tissue-specific transcriptomes is vital to understanding or verifying functions of … The spongy parenchyma has many spaces between cells to facilitate the circulation of air and the exchange of gases. See also PALISADE MESOPHYLL. 3.2). Spongy mesophyll is the site of gaseous exchange for photosynthesis and respiration. Palisade parenchyma cells are present in dorsiventral leaves while spongy parenchyma cells are present in both dorsiventral and isobilateral leaves. The spongy mesophyll's function is to allow for the interchange of gases (CO2) that are needed for photosynthesis. 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