1. ; In xerophytic plants these cells stores water and food in the soluble forms. ; In Nymphaea plant sclereids which give mechanical support to the spongy tissue and secretory cells are also found in these cells. 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. Overview of Spongy Mesophyll The leaf is a vital organ of the plant where most of the functions related to the plant metabolism take place. 3.2). 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. The spongy mesophyll cells are covered by a thin layer of water. 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. The spongy mesophyll cells are less likely to go through photosynthesis than those in the palisade mesophyll. The spongy mesophyll with 2-4 layers consists of isodiametric parenchymatous cells with few intercellular spaces. They are palisade parenchyma and spongy parenchyma. This is a single layer of cells found directly below the cuticle. Palisade parenchyma cells are present in dorsiventral leaves while spongy parenchyma cells are present in both dorsiventral and isobilateral leaves. 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. 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. In plants, it is part of the mesophyll, where it forms a layer next to the palisade cells in the leaf. Gases dissolve in this water as they move into and out of the cells. Comparative Anatomical Studies on Three Endemic Ononis L. (Leguminosae) Species Growing in Turkey/Turkiye'de Yetisen Uc Endemik Ononis L. (Leguminosae) Turu Uzerinde Karsilastirmali Anatomik Calismalar Mesophyll is a major tissue for photosynthesis, and contributes about 80% of total RNA from leaves. The spongy parenchyma has many spaces between cells to facilitate the circulation of air and the exchange of gases. CONTENTS. Overview and Key Difference 2. Both types of cells have chloroplasts and appear in green colour. 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 … Together with the palisade, the spongy layer makes up the mesophyll of the leaf. A layer of cells in the interior of leaves, consisting of loosely arranged, irregularly shaped cells that have chloroplasts. The important functions of the spongy mesophyll are: The presence of chloroplast in the spongy mesophyll tissue also helps in performing the photosynthesis. The spongy mesophyll's function is to allow for the interchange of gases (CO2) that are needed for photosynthesis. Also called spongy mesophyll See more at photosynthesis. 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. Palisade and spongy mesophyll cells are sub-tissues that have different morphologies and physiologies. 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