Stomata Flashcards
What are the secondary responses by blue light (i.e., not proton gradient) that help increase osmotic pressure of stomata cells
Malate is produced by hydrolysis of starch in chloroplast
Uptake of K+ and Cl-
Acumination of sucrose by starch hydrolysis
De novo synthesis of sucrose by photosynthesis
What is a morphogen
Morphogens play key roles in providing positional cues
Auxin is the only plant hormone that is….
polarly transported from cell to cell in an energy dependent manner
What is basipetal and acropetal?
Basipetal -> movement towards the base
Acropetal -> movement away from the base
What is Aux1?
It is an auxin influx pump that pumps 2 H+ per IAA-
It is a permease
What is phyllotaxy
Phyllotaxy is the pattern of leaf formation in shoots
What is the quiescent center
Region of no cell division and elongation in the roots
What is the columella
A central cylinder of the root cap
What are the four root initials?
1) Columella initials
2) Stele initials
3) Epidermal-lateral root cap initial
4) Cortical-endodermal initial
What is endospermic vs. non-endospermic seeds?
Absence and presence of endosperm at seed maturity
What are the three major factors promoting germination?
Water
Oxygen
Temperature
What are the three examples of release from dormancy in the notes?
1) Stratification -> seeds must undergo chilling
2) Seeds must be exposed to certain chemicals to break dormancy
3) Seeds have to undergo dry storage before germination
What is imbibition
A process of water uptake by seeds
What are the two mechanisms of seed dormancy?
Coat imposed dormancy - seed coats can cause dormancy by limiting water permeability, physically constraining the radicle growth, inferring with gas exchange or providing germination inhibitors
Embryo dormancy - inherent nature of plants. It doesn’t want to germinate unless its under favorable conditions
What is the Cholody-Went hypothesis?
Lateral movement (asymmetric distribution) of auxin causes tropisms
