Pattern formation of a Schnakenberg-type plant root hair initiation model

AbstractUltrastructure was investigated along the files of developing epidermal cells in the root tip of a model plant Medicago sativa, in which all rhizodermal cells are potential hair-forming trichoblasts. Differentiation at subcellular level was observed up to the stage of bulge initiation in the trichoblasts. Root hair initiation indicated by the emergence of bulges from trichoblasts was detected at various distances from the root tip and, it was independent of the trichoblast size.During rhizodermal cell differentiation, starch grains accumulated in the plastids. Nuclei located in the central part of the young, meristematic cells moved towards the inner periclinal wall as the central vacuole enlarged. The bulging region of the trichoblasts located opposite the nucleus and was rich in mitochondria, ER, ribosomes, and Golgi bodies, and contained also vesicles enclosing fibrillar material. This material responded positively to phosphotungstic acid, which was used for detection of cell wall polysaccharides. The cell wall thickness within the bulging domain was significantly lower than in other parts of trichoblasts. We suggest that internalization of cell wall polysaccharides occurs within the bulging area, contributing to local thinning of the cell wall and providing a source of osmotically active compounds for maintaining turgor in the trichoblast. Thus, the internalization process might be necessary for root hair outgrowth.

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Identification of Symbiotically Defective Mutants of Lotus japonicus Affected in Infection Thread Growth

Molecular Plant-Microbe Interactions ◽

10.1094/mpmi-19-1444 ◽

2006 ◽

Vol 19 (12) ◽

pp. 1444-1450 ◽

Cited By ~ 20

Author(s):

Fabien Lombardo ◽

Anne B. Heckmann ◽

Hiroki Miwa ◽

Jillian A. Perry ◽

Koji Yano ◽

...

Keyword(s):

Root Hair ◽

Plant Cell Wall ◽

Plant Root ◽

Lotus Japonicus ◽

Cortical Cell ◽

Host Cells ◽

Infection Thread ◽

Mycorrhizal Symbiosis ◽

Symbiotic Interaction ◽

Infection Threads

During the symbiotic interaction between legumes and rhizobia, the host cell plasma membrane and associated plant cell wall invaginate to form a tunnel-like infection thread, a structure in which bacteria divide to reach the plant root cortex. We isolated four Lotus japonicus mutants that make infection pockets in root hairs but form very few infection threads after inoculation with Mesorhizobium loti. The few infection threads that did initiate in the mutants usually did not progress further than the root hair cell. These infection-thread deficient (itd) mutants were unaffected for early symbiotic responses such as calcium spiking, root hair deformation, and curling, as well as for the induction of cortical cell division and the arbuscular mycorrhizal symbiosis. Complementation tests and genetic mapping indicate that itd2 is allelic to Ljsym7, whereas the itd1, itd3, and itd4 mutations identified novel loci. Bacterial release into host cells did occur occasionally in the itd1, itd2, and itd3 mutants suggesting that some infections may succeed after a long period and that infection of nodule cells could occur normally if the few abnormal infection threads that were formed reached the appropriate nodule cells.

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Effects of glucose and ethylene on root hair initiation and elongation in lettuce (Lactuca sativa L.) seedlings

Journal of Plant Research ◽

10.1007/s10265-017-1003-8 ◽

2017 ◽

Vol 131 (3) ◽

pp. 543-554 ◽

Cited By ~ 1

Author(s):

Wakana Harigaya ◽

Hidenori Takahashi

Keyword(s):

Lactuca Sativa ◽

Root Hair ◽

Lactuca Sativa L ◽

Root Hair Initiation

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Plant Root Hair Growth in Response to Hormones

Notulae Botanicae Horti Agrobotanici Cluj-Napoca ◽

10.15835/nbha47111350 ◽

2018 ◽

Vol 47 (2) ◽

pp. 278-281 ◽

Cited By ~ 2

Author(s):

Dejian ZHANG ◽

Chunyan LIU ◽

Yujie YANG ◽

Qiangsheng WU ◽

Yeyun LI

Keyword(s):

Jasmonic Acid ◽

Methyl Jasmonate ◽

Root Hair ◽

Hair Growth ◽

Reverse Genetics ◽

Current Knowledge ◽

Plant Root ◽

Root Surface Area ◽

Acid Methyl ◽

Root Hair Growth

Plant root hair is tubular projections from the root epidermis. Its can increase root surface area, which is very important for nutrients and water uptake as well as interaction with soil microorganisms. In this short review, we discussed the effects of hormones (auxin, ethylene, jasmonic acid, methyl jasmonate, strigolactones, and brassinosteroids) on root hair growth. It was highlight the interaction between auxin and ethylene on root hair growth. Furthermore, the mechanisms of jasmonic acid, methyl jasmonate, strigolactone and brassinosteroids on root hair growth may through auxin or ethylene signaling pathway partly. In future, more genes relating to root hair growth needed clone and elucidate their roles, as well as undertaking reverse genetics and mutant complementation studies to add the current knowledge of the signaling networks, which are involved in root hair growth that regulated by hormones.

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Regulation of Root Hair Initiation and Expansin Gene Expression in Arabidopsis

The Plant Cell ◽

10.1105/tpc.006437 ◽

2002 ◽

Vol 14 (12) ◽

pp. 3237-3253 ◽

Cited By ~ 266

Author(s):

Hyung-Taeg Cho ◽

Daniel J. Cosgrove

Keyword(s):

Gene Expression ◽

Root Hair ◽

Expansin Gene ◽

Root Hair Initiation

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