BIO120H1 Study Guide - Midterm Guide: Interphase, Hydrolase, Zygote
36
BIO120H1 Full Course Notes
Verified Note
36 documents
Document Summary
Vascular connections are absent between embryo/endosperm and seed coat. Seed coat vascular tissue embryo (cid:144) cell wall and vacuolar acid invertase activity in seed coat is linked to cell division/growth (cid:144) cell wall acid invertase facilitates phloem unloading in seed coat. Increased sucrose stimulates transfer cell wall development in protoderm of embryo (cid:144) transfer cell wall development (cid:198) increase in expression sucrose/proton symporter in transfer cell membrane (cid:144) embryo transit from high-hexose state to high- sucrose state. Induces switch from mitotic growth to cell expansion. Hexoses act to upregulate transcription of transporters that move more hexoses in. Hexoses stimulate cell division, more cells in seed more compounds it can store. Innermost layer of cortex (cid:48) endodermal cells have casparian strip, hydrophobic suberin and lignin deposition in walls. Suberin strip forces water into cells so it crosses plasma membrane this helps plant control movement of ions and minerals via membrane pumping.
