“Etioplast”的意思、由来-开放百科全书

词条

Etioplast

释义

See also
References

Etioplasts are chloroplasts that have not been exposed to light. They are usually found in flowering plants (Angiosperms) grown in the dark. If a plant is kept out of light for several days, its normal chloroplasts will actually convert into etioplasts. Etioplasts lack active pigment and can technically be considered leucoplasts. High concentrations of etioplasts will cause leaves to appear yellow rather than green.^[1]

These plant organelles contain prolamellar bodies, which are membrane aggregations of semi-crystalline lattices of branched tubules that carry the precursor pigment for chlorophyll. The prolamellar bodies are often (and presumed always) arranged in geometric patterns.^[1]

They are converted to chloroplasts via the stimulation of chlorophyll synthesis by the plant hormone cytokinin soon after exposure to light. Thylakoids and grana arise from the prolamellar bodies during this process.

References

1. ^¹{{cite book|last=Wise|first=Robert|title=The Diversity of Plastid Form and Function|publisher=Springer|date=2007|chapter=1|url=http://www.springerlink.com/index/qp032630631337u6.pdf}}

2 : Organelles|Plant physiology

随便看

开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。

See also

References