PSE 410 Exam 2 Questions & Answers 2024/2025
Adventitious Organs - ANSWERSPlant organs that arise in "unexpected" location
Adventitious roots - ANSWERSRoots that arise from stems leaves, or old root parts
Adventitious Organogenesis - ANSWERSRequires: De-differentiation of previously diff...
, Herbaceous plant adventitious root formation - ANSWERSOutside of, and between vascular bundles,
often phloem parenchyma
-Sometime on epidermis or elsewhere
Woody plant adventitious root formation - ANSWERS+occurs in phloem, cambium, vascular ray
parenchyma
+Epidermis, cortex, pith
+callus derived from all of the above
Stages of de novo adventitious root formation - ANSWERS1. Dedifferentiation of cells into meristematic
regions
2. Formation of root initials from newly meristematic cells
3. Development of root initials into organize root primordia
4. Root elongation: (a) root primordia elongating through cortex, pushing out sclereids (b) Two
adventitious primordia elongating through cortex and periderm
Time to root formation - ANSWERS+Variable, Some taxa are slow to form root primordia.
-Several months to form primordia, root emerge within a couple more weeks.
Direct root formation - ANSWERSEasier-to-root species, formation of primordia near vascular system
Root cuttings - ANSWERS-Require formation of adventitious shoots and roots, shoots will appear first
-Roots form from base of shoot
-Typically useful for "suckering" plants
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