種子與果實(shí)的發(fā)育課件

第九章種子與果實(shí)的發(fā)育Evaluauononr.chAsposeslidesforNET4odientPEvaluationonly.CreatedwithAsposeSlidesforNET4.0dientProfilo71Copyright2019-2019AsposePtyL種子的發(fā)育被子植物雙受精后,由合子發(fā)育成胚,由受精的極核(中央細(xì)胞)發(fā)育成胚乳,由珠被發(fā)育成種皮。胚、胚乳(或無)、種皮共同構(gòu)成種子。Evaluauononr.chAsposeslidesforNET4odientPEvaluationonly.CreatedwithAsposeSlidesforNET4.0dientProfilo71Copyright2019-2019AsposePtyL胚的發(fā)育(一)雙子葉植物胚的發(fā)育合子不均等的橫向分裂頂細(xì)胞和基細(xì)胞。基細(xì)胞多次橫分裂單列多細(xì)胞胚柄頂細(xì)胞縱分裂和橫分裂二細(xì)胞原胚、四細(xì)胞原胚、八細(xì)胞原胚各向分裂球形原胚、心形原胚。心形原胚胚的各個部分Evaluauononr.chAsposeslidesforNET4odientPEvaluationonly.CreatedwithAsposeSlidesforNET4.0dientProfilo71Copyright2019-2019AsposePtyL6頂細(xì)胞球狀胚體珠被芽胚乳球狀胚體胚芽胚0球形胚R.心形胚胚根薺菜胚的發(fā)育過程Evaluauononr.chAsposeslidesforNET4odientPEvaluationonly.CreatedwithAsposeSlidesforNET4.0dientProfilo71Copyright2019-2019AsposePtyL薺菜胚珠被胚粞胚乳球形胚乳基細(xì)EvaluadononlychAsposeslidesforNET4odientPEvaluationonly.CreatedwithAsposeSlidesforNET4.0dientProfilo71Copyright2019-2019AsposePtyL薺菜幼胚被胚chAsposeslidesforNET4odientPEvaluationonly.CreatedwithAsposeSlidesforNET4.0dientProfilo71Copyright2019-2019AsposePtyL子的進(jìn)人休眠狀態(tài),解除體喝受精△二形成纖維素形成經(jīng)一次橫分裂卵細(xì)胞6~10個細(xì)胞組成的柄頂端一個細(xì)胞參與形成近珠孔端基細(xì)趣、連續(xù)多次分裂形成個細(xì)胞部分胚根、胚軸近合點(diǎn)端次垂直的次橫分裂個細(xì)胞頂細(xì)胞分裂形動四細(xì)胞原胚形成→八細(xì)胞原胚個細(xì)胞進(jìn)進(jìn)行多次各十六細(xì)胞原胚次平周分裂方向的分裂子葉原基進(jìn)一步起形成子葉原基·心形胚生長,胚芽生出球形胚頂端兩側(cè)生長快突基部細(xì)胞形成胚魚雷胚期根的一部分Evaluauononr.chAsposeslidesforNET4odientPEvaluationonly.CreatedwithAsposeSlidesforNET4.0dientProfilo71Copyright2019-2019AsposePtyL(二)單子葉植物胚的發(fā)育(小麥)·受精卵(橫裂,斜向)→頂細(xì)胞(斜裂,次)4細(xì)胞原胚基細(xì)胞(同上)→(各向分裂)棒狀胚體→胚(單子葉)Evaluauononr.chAsposeslidesforNET4odientPEvaluationonly.CreatedwithAsposeSlidesforNET4.0dientProfilo71Copyright2019-2019AsposePtyL費(fèi)0盾片胚柄盾片生長維胚芽生長錐第一營養(yǎng)葉胚芽鞘外胚葉胚根胚根鞘胚芽鞘Evaluauononr.chAsposeslidesforNET4odientPalvetonoCreatedwithAsposeSlidesforNET4.0dientProfilo71Copyright2019-2019AsposePtyL胚乳愈合的果皮與種皮胚芽鞘外胚葉胚胚芽玉米穎果結(jié)構(gòu)圖胚軸胚根胚根鞘Evaluauononr.chAsposeslidesforNET4odien