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09-SEPTEMBER-2008 19:33:10 - Fruit anatomy Redirected from Endocarp Longitudinal section of female flower of squash courgette, showing ovary, ovules, pistil, and petals. Longitudinal section of female flower of squash courgette, showing ovary, ovules, pistil, and petals. A fruit in botany refers to a mature ovary. In fleshy fruits, the outer, often edible, layer is the pericarp, which is the tissue that develops from the ovary wall of the flower and surrounds the seeds. If seeds are considered to be akin to eggs eggs developing in the ovary of a fowl, the pericarp would be the female bird's uterus. However, there are a large number of fruits which are not adequately described by that analogy; for example in most nuts and legumes the edible part is the seed and not the pericarp. Many edible vegetables are actually stems, leaves, and even roots of the plant, but others like the cucumber, squash etc. are the common pericarp and are botanically considered to be fruits. Finally, in some seemingly pericarp fruits the edible portion is actually an aril. Contents 1 Categories of fruits 2 Anatomy of simple fruits 2.1 Pericarp layers 2.1.1 Exocarp 2.1.2 Mesocarp 2.1.3 Endocarp 2.2 Anatomy of grass fruits 3 See also 4 References Categories of fruits Fruits come in three main anatomical categories: Simple fruits are formed from a single ovary and may contain one to many seeds. They can be either fleshy or dry. Examples of simple fleshy fruits are berries, drupes and pomes. Examples of dry fruits include nuts and grains. Aggregate fruits are formed from a single compound flower and contain many ovaries. Examples include raspberries and blackberries. Multiple fruits are formed from the fused ovaries of multiple flowers. An example for a multiple fruit is pineapple. Anatomy of simple fruits Diagram of a typical drupe peach, showing both fruit and seed Diagram of a typical drupe peach, showing both fruit and seed In berries and drupes, the pericarp forms the edible tissue around the seeds. In accessory fruits, other tissues develop into the edible portion of the fruit instead, for example the receptacle of the flower in apples and strawberries. Pericarp layers The pericarp itself is typically made up of three distinct layers: the exocarp which is the most outside layer or peel, the mesocarp the middle layer or pith, and the endocarp the inner layer surrounding the hollowed ovary or the containing seeds. Exocarp Exocarp Gr. outside + fruit, is a botanical term for the outermost layer of the pericarp or fruit. The exocarp forms the tough outer skin of the fruit which bears oil glands and pigments. The exocarp is sometimes called the epicarp, or, especially in citruses, the flavedo. A schematic picture of an orange hesperidium A schematic picture of an orange hesperidium Flavedo is mostly composed of cellulosic material but also contains other components, such essential oils, paraffin waxes, steroids and triterpenoids, fatty acids, pigments carotenoids, chlorophylls, flavonoids, bitter principles limonene, and enzymes. In citrus fruits, the flavedo constitutes the peripheral surface of the pericarp. It is composed of several cell layers that become progressively thicker in the internal part; the epidermic layer is covered with wax and contains few stomata, which in many cases are closed when the fruit is ripe. When ripe, the flavedo cells contain carotenoids mostly xanthophyll inside chromoplasts which, in a previous developmental stage, contained chlorophyll. This hormonally controlled progression in development is responsible for the fruit's change of color from green to yellow upon ripening. The internal region of the flavedo is rich in multicellular bodies with spherical or pyriform shapes, which are full of essential oils. Mesocarp Mesocarp Gr. middle + fruit or Sarcocarp Gr. flesh + fruit, is the botanical term for the succulent and fleshy middle layer of the pericarp of drupaceous fruit, between the exocarp and the endocarp; it is usually the part of the fruit that is eaten. This term may also refer to any fruit which is fleshy throughout. In a hesperidium, the mesocarp is also referred to as albedo or pith because of its soft fiber. It is part of the peel which is commonly removed by hand. Endocarp Endocarp Gr. inside + fruit, is a botanical term for the inside layer of the pericarp or fruit, which directly surrounds the seeds. It may be membranous as in citrus where it is the only part consumed, or thick and hard as in the stone fruits of the subfamily Prunoideae such as peaches, cherries, plums, and apricots. In nuts, it is the stony layer that surrounds the kernel of pecans, walnuts etc. and which is removed prior to consumption. Anatomy of grass fruits The grains of grasses are single-seeded simple fruits where the pericarp ovary wall and seed coat are fused into one layer. This type of fruit is called a caryopsis. Examples include cereal grains, such as wheat, barley and rice. See also Wikimedia Commons has media related to: Fruit anatomy Peel fruit Hesperidium the common citrus berry. v d e Types of fruits Berries · False berries · Hesperidia · Drupes · Pomes · Compound fruits · Multiple fruits · Accessory fruit References Citrus fruits - contains diagram, although the page itself appears to have been poorly translated from another language This article incorporates text from the Encyclopædia Britannica Eleventh ion, a publication now in the public domain. Retrieved from http://en..org/wiki/Fruit_anatomy#Endocarp Categories: Citrus | Plant morphology Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Català Česky Deutsch Español Esperanto Français Ido Italiano 日本語 Português СрпÑ?ки / Srpski This page was last modified on 17 August 2008, at 06:20
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