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保衛細胞&氣孔開閉的機制 (guard cell's feature (氣孔 (一對腎形的guard cell form,…
保衛細胞&氣孔開閉的機制
guard cell's feature
氣孔
一對腎形的guard cell form
guard cell兩端接合.中間互相分離的縫隙
from表皮cell特化
型態.構造.功能皆異
葉綠體
表皮X
保衛O→光合作用
cell wall不均勻增厚
相鄰氣孔→厚
相鄰guard cell→薄
cell wall上纖維素微絲輻射排列圍繞guard cell
∵guard cell兩端相接
∴吸水膨脹時向外彎曲鼓起→氣孔open
氣孔開閉的機制
control by guard cell's膨壓
大量水分滲入cell內時.cell膨脹對cell wall產生的壓力
DAY
plant光合作用
guard cell transport K+ to cell內by主動運輸.[K+]↑
osmotic pressure↑
水滲入guard cell.膨壓↑.向cell wall較薄方向凸
two guard cells'內側cell wall被拉開
氣孔open
NIGHT
guard cell release K+.[K+]↓
osmotic pressure↓
水滲出guard cell.膨壓↓
two guard cell萎縮closer
氣孔close