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"The Result" PPT courseware
(1) The formation of fruits
The ovary develops into the fruit and the ovary wall becomes the pericarp. In addition to the ovary, other parts of angiosperms such as the receptacle and calyx are also involved in the formation of the exocarp, mesocarp, and endocarp of the fruit.
Parthenocarpy - spontaneous parthenocarpy: such as bananas, persimmons, papayas, etc.
Inducing parthenocarpy: tomatoes, grapes, and various growth hormones are sprayed on the stigma.
Seedless fruits: Due to the phenomenon of parthenocarpy, seedless fruits can be obtained.
Ripening: the process of a series of physiological changes that occur after the fruit stops growing.
(2) Types of fruits
Classification of fruits
Basis 1: Source of peel
The peel is only developed from the ovary wall → it is called a true fruit
Developed from the ovary wall and other parts of the flower → false fruit
Basis 2: Number of pistils in a flower
There is only one pistil, forming one fruit → single fruit
There are multiple pistils, forming multiple fruits, which are gathered together → aggregate fruit
The entire inflorescence develops into fruits together → Juhuaguo (complex fruit)
Basis 3: According to the properties of the peel
After maturity, the peel is thick and the flesh is called fleshy fruit.
After ripening, the peel is dry and juiceless and the fruit is called dried fruit.
Classification based on the properties of the peel when the fruit is ripe
fleshy fruit
Berries: Mesocarp and endocarp are fleshy, with many seeds. Tomatoes, melons, citrus
Drupe: The outer skin is membranous, medium fleshy, and the inner wood is woody, with 1 seed.
Pome: The ovary is inferior, the receptacle participates in fruit formation, and the endocarp is woody.
dried fruit
cracked fruit
Pod: single carpel, split along dorsal and ventral sutures. pod
Results: Single carpel, split along dorsal or ventral sutures. Star anise, peony
Capsule: connate carpel, 1 or more cells, many seeds, various dehiscence methods
Silique: 2-carpel, 2-chambered, with false septum, split along ventral suture. Rapeseed, cabbage
closed fruit
Achenes: small, 1 seed, hard skin, easy to separate from seeds, sunflower
Samara: the peel extends into a wing shape, which is easy to spread by the wind, maple, elm
Nuts: The peel is woody, with 1 seed and involucre, hazelnut, chestnut
Caryopsis: The pericarp is thin, leathery, healed with the seed coat, 1 seed. wheat
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