Plasmodesma 2001: on safari through the symplast.
نویسندگان
چکیده
Plant cells need to communicate with each other to orchestrate lifelong development, to integrate physiological processes, and to coordinate pathogen defense responses. The transmission of intercellular signals is an important means of regulating all plant life processes, from fertilization to senescence. In this framework, plasmodesmata (PD)— nanopores lined by plasma membrane that bridge the cytoplasm of most plant cells to their neighbors—play a pivotal role. PD function as relay stations in a unique cellular internet for the rapid exchange of water, metabolites, and even macromolecules. Exciting progress has been made in the field of plasmodesmal research, as reported at the 4th International Plasmodesma meeting in Cape Town, South Africa, in August 2001.
منابع مشابه
Transpiration rate. An important factor controlling the sucrose content of the guard cell apoplast of broad bean.
Evaporation of water from the guard cell wall concentrates apoplastic solutes. We hypothesize that this phenomenon provides two mechanisms for responding to high transpiration rates. First, apoplastic abscisic acid is concentrated in the guard cell wall. Second, by accumulating in the guard cell wall, apoplastic sucrose (Suc) provides a direct osmotic feedback to guard cells. As a means of test...
متن کاملThe structure of plasmodesmata as revealed by plasmolysis, detergent extraction, and protease digestion
Plasmodesmata or intercellular bridges that connect plant cells are cylindrical channels approximately 40 nm in diameter. Running through the center of each is a dense rod, the desmotubule, that is connected to the endoplasmic reticulum of adjacent cells. Fern, Onoclea sensibilis, gametophytes were cut in half and the cut surfaces exposed to the detergent, Triton X 100, then fixed. Although the...
متن کاملMany rivers to cross: the journey of zinc from soil to seed
An important goal of micronutrient biofortification is to enhance the amount of bioavailable zinc in the edible seed of cereals and more specifically in the endosperm. The picture is starting to emerge for how zinc is translocated from the soil through the mother plant to the developing seed. On this journey, zinc is transported from symplast to symplast via multiple apoplastic spaces. During e...
متن کاملLeaf water relations and maintenance of gas exchange in coffee cultivars grown in drying soil.
Plant water status, leaf tissue pressure-volume relationships, and photosynthetic gas exchange were monitored in five coffee (Coffea arabica L.) cultivars growing in drying soil in the field. There were large differences among cultivars in the rates at which leaf water potential (Psi(L)) and gas exchange activity declined when irrigation was discontinued. Pressure-volume curve analysis indicate...
متن کاملOnion root water transport sensitive to water channel and K+ channel inhibitors.
Transroot osmotic water flux (Jos) and radial hydraulic conductivity (Lpr) in onion roots were greatly increased by three means; infiltration of roots by pressurization, repetition of osmosis and chilling at 5 degrees C. Jos was strongly reduced by the water channel inhibitor HgCl2 (91%) and the K+ channel inhibitor nonyltriethylammonium (C9, 75%), which actually made the membrane potential of ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- The Plant cell
دوره 14 1 شماره
صفحات -
تاریخ انتشار 2002