Translocation of Solutes and Mass flow hypothesis

Ad

Ad

Ad

Ad

Ad

Ad

Ad

Ad

Ad

Ad

Ad

Ad

SUBMITTED BY
ANANDHALAKSHMI A. L
BSc Botany 2016-19
GOVERNMENT COLLEGE KOTTAYAM

 Long distance transport of materials through xylem and
phloem.
 Xylem translocation involves the transport of absorbed
...

Downward
translocation
 Occurs from leaves to
stem and roots
 The food synthesised in
leaves are transported to
sinks in...

 Occurs near stem apices or at the
growing points of stem nodes.
 The food received from mature leaves is
transported up...

Active
Physiological process
Passive
Physical process

 Phloem loading
 Phloem unloading

 The initial transfer of photosynthate from leaf mesophyll to
the seive elements of minor veins.
 It is the transfer of ...

 Seive tubes are connected to adjacent cells
through plamodesmata.
 Primitive and less efficient mechanism
 Plants with...

 Takesplace in the absence of
plasmodesmata connections.
 Acts against environmental adversaries,
such as drought and lo...

 Reverse of phloem loading
 Transfer of solutes from sieve tubes to
the sink
 Occurs in a concentration gradient
 Can ...

Short-distance translocation
 Protoplasmic streaming
 Contractile protein hypothesis
 Diffusion hypothesis
 Activated ...

Protoplasmic
streaming
hypothesis
•de Vries in 1885
•Later on accepted by Cany (1952) and Thaine (1962)
•Organic solutes m...

Activated
diffusion theory
• Proposed by Mason and Maskell (1936)
• Theory states that acceleration of the diffusion of
fo...

 Proposed by Munch (1926)
 Osmotic mechanism controls downward movement of organic
substances in phloem.
 During photos...

Solute
concentr
ation high
• As Carbohydrates
are continuously
synthesized
Osmotic
potential
increases
• As a result they
...

At the sink end like roots and storage
organs sugar is unloaded
Cells either consume it or convert it
into insoluble stora...

 Widely accepted
 It is supported by the fact that phloem sap,
containing high sugar content, exudates from
the cut end ...

 Explains about unidirectional flow whereas in plants its usually
bidirectional
 Does not account for an active role of ...

 Define
 Source
 Sink
 Downward translocation
 Upward translocation
 Radial translocation
 Bidirectional translocat...

Translocation of Solutes and Mass flow hypothesis

Share Slideshare

LinkedIn
Facebook
Twitter

Embed

Size (px)

Show related Slideshows at end

WordPress Shortcode

Link

Share
Email

2024 Trend Updates: What Really Wor... by Search Engine Jou... 1054718 views
Storytelling For The Web: Integrate... by Chiara Aliotta 970719 views
Artificial Intelligence, Data and C... by OECD Directorate ... 905165 views
How to Leverage AI to Boost Employe... by SocialHRCamp 382887 views
2024 State of Marketing Report – by... by Marius Sescu 216911 views
Everything You Need To Know About C... by Expeed Software 234552 views

View on Slideshare

1 of 27 Ad

View on Slideshare

1 of 27 Ad