Phloem sap mobility
nounPronunciation: /ˈfloʊəm sæp moʊˈbɪləti/
The movement and transport of carbohydrates, amino acids, and signaling molecules through the phloem tissue from source (photosynthetic) to sink tissues under conditions of stress and normal growth. Reduced phloem mobility during stress constrains nutrient allocation and stress signal distribution throughout the plant.
Plain English
The flow of sugars and nutrients through plant vascular tubes that delivers energy from leaves to roots and growing tissues.
Etymology & History
Usage
"Heat stress reduced phloem sap mobility, limiting carbohydrate delivery to developing grains and substantially decreasing final yield."
Style guide notes: Use 'phloem sap mobility' when emphasizing active transport dynamics; use 'phloem translocation' for general nutrient movement.
Also known as
Contrasted with
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Frequently Asked Questions
Why does heat stress reduce phloem sap mobility?
High temperatures disrupt protein structure in sieve elements, reducing active transport of sugars through phloem vessels.
How does reduced phloem mobility affect plant growth?
Insufficient nutrient delivery to sinks like roots and developing fruits limits growth and increases stress vulnerability.
Why Test Candidates on This?
Important for understanding yield formation limitations under heat and drought stress in crop physiology research.
Required skill level: Senior