เมล็ด

posted on 19 Jan 2011 16:43 by function-planty
 
เป็นส่วนที่พืชดอกใช้ กระจายพันธุ์ เจริญมาจากovuleประกอบด้วย 3 ส่วน คือ
1.เปลือกหุ้มเมล็ด(seed coat)เจริญมาจากintegumentที่หุ้ม ovule อยู่แต่ก่อน
2. endosperm เกิดจากการปฏิสนธิ ทำหน้าที่เป็นอาหารสะสมในการเจริญเติบโตของต้นอ่อน
3. เอมบริโอ เจริญzygote ประกอบด้วย
 3.1 epicotyl อยู่เหนือใบเลี้ยง
 3.2 ใบเลี้ยง(cotyledon) ทำหน้าที่สะสมอาหาร,ช่วยในการงอก, สังเคราะห์ด้วยแสง+protect
 3.3 hypocotylอยู่ใต้ใบเลี้ยง
 3.4 รากอ่อน(radicle) เจริญเป็นรากแก้วในพืชใบเลี้ยงคู่
 
 
 
 
พืชบางชนิดก็สะสมอาหารไว้ที่endospermแทนที่จะเป็นใบเลี้ยง จึงแบ่งประเภทเมล็ดได้ออกเป็น
1.albuminous seed เมล็ดที่มี endosperm สะสมอาหาร พบใน พืชใบเลี้ยงเดี่ยวส่วนมาก
   และใบเลี้ยงคู่เช่น ละหุ่ง ละมุด กาแฟ
2.exalbuminous seed เมล็ดที่ใบเลี้ยงหลั่งเอนไซม์amylase ออกมาย่อยendospermแล้วดูด
   อาหารมาสะสมไว้ที่ใบเลี้ยงเอง พบในใบเลี้ยงคู่ เว้น ละหุ่ง ละมุด กาแฟ 

edit @ 20 Jan 2011 20:49:23 by Bist503_g5#

edit @ 20 Jan 2011 20:59:48 by Bist503_g5#

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