Abstract
In their organs – roots, leaves, and stems – higher plants possess bidirectional barriers blocking apoplastic transport by diffusion of water and solutes. These are in the roots, (1) an endodermis (EN), (2) an exodermis (EX), and (3) EN-type cell layers in N2-fixing root nodules; in the leaves (4) envelopes of glands, gland hairs, and trichomes, (5) bundle sheaths, and (6) EN-type cell layers around the haustoria of rust fungi; (7) an EN-type cell layer in stems; and (8) a structurally invisible transport barrier in the root tip. Cell wall encrustations by lignin and adcrustations by suberin lamellae and by cutin prevent transport within the free spaces of the cell walls and transport across the cell walls. The latter is mediated by plasmodesmata.
Individually these transport barriers at strategic locations in the plant organs enforce switches between apoplastic and symplastic transport. These switches involve transport across membranes, and this ensures metabolic control over the solutes transported. Collectively the complement of the bidirectional transport barriers regulates the integrated harmonious functioning of the plants as whole entire organisms.
The cell wall structures of the apoplastic barriers in some cases, e.g., the root EN, have been shown not to be static anatomical elements but to be dynamic in response to internal development and environmental cues. Recent studies identify molecular signaling modules of developmental integrity of the radial cell wall encrustations in the Casparian strips in the root EN. Molecular studies also demonstrate hormonal control of reversible suberinization in response to environmental factors. The Scr gene and SCARECROW transcription factor regulate some of the barriers at distant locations within the plants. This opens a fascinating outlook for more work of plant molecular biology unraveling the integrated functioning of the transport-barrier complement.
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Abbreviations
- ABA:
-
Abscisic acid
- AFS:
-
Apparent free space
- BS:
-
Bundle sheath
- CASP:
-
CASPRIAN STRIP MEMBRANE DOMAIN PROTEINS
- CIF:
-
CASPARIAN STRIP INTEGRITY FACTORS
- CL:
-
Cellulose layers
- CS:
-
Casparian strip
- DFS :
-
Donnan free space
- EN:
-
Endodermis
- EX:
-
Exodermis
- M:
-
Mesophyll
- PD:
-
Plasmodesmos, plasmodesmata
- PEP:
-
Phosphoenolpyruvate
- PEPC:
-
Phosphoenolpyruvate carboxylase
- PM:
-
Plasma membrane
- PW:
-
Primary cell wall
- ROS:
-
Reactive oxygen species
- RuBISCO:
-
Ribulosebisphosphate carboxylase/oxygenase
- SGN:
-
SCHENGEN RECEPTOR LIKE KINASE
- SL:
-
Suberin lamellae
- WFS:
-
Water free space
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Acknowledgment
I thank C. Barry Osmond for his help with the literature on the mesophyll/bundle sheath interface in the leaves of C4 plants. I am grateful to Rainer Matyssek for reading a draft of the essay and making valuable comments and to Francisco Cánovas for editing the essay.
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Lüttge, U. (2019). Bidirectional Lateral Transport Barriers in Serving Plant Organs and Integral Plant Functioning: Localized Lignification, Suberinization, and Cutinization. In: Cánovas, F.M., Lüttge, U., Risueño, MC., Pretzsch, H. (eds) Progress in Botany Vol. 82. Progress in Botany, vol 82. Springer, Cham. https://doi.org/10.1007/124_2019_36
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