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Section six The seed Seed is a characteristic reproductive organs of seed plant. The flower through pollination and fertilization, ovule in ovary developed seed.
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For example Semen Armeniacae Amarum( 苦杏仁 ) ; Semen Astragali Complanati( 沙苑子 ) ; Semen Cassiae( 决明子 )and so on.
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Semen Armeniacae Amarum Semen Astragali Complanati Semen Cassiae
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Part one shape and structure of seed Shape, size, color, exterior texture and so on in different with different species.
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They have various form : roundness (coconut), elliptical(gingko), kidney-shaped(bean), heart- shaped( Semen Armeniacae Amarum ), diamond( Semen Cassiae ) and so on.
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sizes : large coconut, gingko and pinang. small seed of plantain, Gastrodia elata seed( 天麻种子 ) and Bletilla striata seed( 白芨种子 ).
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colour : mung bean and white haricot bean. surface : coarseness(coconut), rumple(Semen Euphorbiae), trichoma(Semen Strychni) etc.
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pinang gingko Gastrodia elata plantain coconut
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mung bean white haricot bean soya jequirity Vigna angularis
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Structure seed coat embryo endosperm
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Transverse section of Semen Armeniacae Amarum
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1.seed coat(integument) ① hilum : it is a round or elliptical scar falling from funicle or placenta of mature seed. ② micropyle : the reached part of radicle or of absorbed water when seed bourgeon. ③ chalaza : meeting dot of vascular bundle in seed coat. ④ raphe : ridgy line between hilum and chalaza.
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1.Hilum 2. chalaza 3. raphe 4.micropyle 5.seed coat 6. radicle 7. Plumule 8. cotyledon 9. embryo axis
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⑤ caruncle : integument extend a spongy tuber, absorbing water for helping bourgeon of seed. like castor-oil plant or croton. ⑥ aril : funicle and tissue in placenta extend to form. For example, lichi( 荔枝 ), longan( 龙眼 ) (succulent) and Fructus Amoni( 砂仁 ) ( membranaceous ).
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lichi longan Fructus Amoni
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2.embryo radicle: will develop main root embryo axis: will develop the part connecting root and stem plumule: will develop stem and leaf cotyledon:Dicotyledoneae and Monocotyledoneae.
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3.endosperm It has white colour and locates around embryo. It has nourishment, starch, protein or fat etc. Perisperm, it is a not entirely absorbing nourishment around embryo and endosperm in budding process of seed.
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1.Seedcoat 2.vascular bundle 3.putting wrong tissue 4.endosperm
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Part two the type of seed According endosperm have or not ① Albuminous seed Embryo is comparatively small, cotyledon is thin. Like wheat and rice etc.
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1.hilum2.raphe3.chalaza4.caruncle5.seed coat 6.cotyledon7.endosperm8. plumule9. embryo axis10.radicle
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② Exalbuminous seed Cotyledon is freshy without endosperm. like soya, almond and seed of pumpkin.
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1.Hilum 2. chalaza 3. raphe 4.micropyle 5.seed coat 6. radicle 7. Plumule 8. cotyledon 9. embryo axis
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Review Questions 一.Definition aril, hilum, micropyle, chalaza, raphe, caruncle 二.simple answer 1.what is the composing of the embryo?
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