Nucellar projection transfer cells in the developing wheat grain

PROTOPLASMA ◽  
1994 ◽  
Vol 182 (1-2) ◽  
pp. 39-52 ◽  
Author(s):  
H. L. Wang ◽  
C. E. Offler ◽  
J. W. Patrick
Keyword(s):  
Transfer Cells ◽  
Wheat Grain ◽  
Nucellar Projection

scholarly journals Localization, Gene Expression, and Functions of Glutamine Synthetase Isozymes in Wheat Grain (Triticum aestivum L.)

2021 ◽  
Vol 12 ◽  
Author(s):  
Yihao Wei ◽  
Shuping Xiong ◽  
Zhiyong Zhang ◽  
Xiaodan Meng ◽  
Lulu Wang ◽  
...  
Keyword(s):  
Glutamine Synthetase ◽  
Nitrogen Metabolism ◽  
Glutamate Synthase ◽  
Grain Filling ◽  
Maximum Activity ◽  
Transfer Cells ◽  
Aleurone Layer ◽  
Wheat Grain ◽  
Plant Nitrogen ◽  
Endosperm Transfer Cells

Glutamine synthetase (GS) plays a major role in plant nitrogen metabolism, but the roles of individual GS isoforms in grains are unknown. Here, the localization and expression of individual TaGS isozymes in wheat grain were probed with TaGS isoenzyme-specific antibodies, and the nitrogen metabolism of grain during the grain filling stage were investigated. Immunofluorescence revealed that TaGS1;1, TaGS1;3, and TaGS2 were expressed in different regions of the embryo. In grain transporting tissues, TaGS1;2 was localized in vascular bundle; TaGS1;2 and TaGS1;1 were in chalaza and placentochalaza; TaGS1;1 and TaGS1;3 were in endosperm transfer cells; and TaGS1;3 and TaGS2 were in aleurone layer. GS exhibited maximum activity and expression at 8 days after flowering (DAF) with peak glutamine content in grains; from then, NH4+ increased largely from NO3- reduction, glutamate dehydrogenase (GDH) aminating activity increased continuously, and the activities of GS and glutamate synthase (GOGAT) decreased, while only TaGS1;3 kept a stable expression in different TaGS isozymes. Hence, GS-GOGAT cycle and GDH play different roles in NH4+ assimilation of grain in different stages of grain development; TaGS1;3, located in aleurone layer and endosperm transfer cells, plays a key role in Gln into endosperm for gluten synthesis. At 30 DAF, grain amino acids are mainly transported from maternal phloem.

Lectins as Cytochemical Probes of the Developing Wheat Grain. I. Fluorescein-Labelled Lectins Covering a Range of Specificities With Emphasis on Those That Bind D-Galactose.

1982 ◽  
Vol 9 (6) ◽  
pp. 647 ◽  
Author(s):  
BA Baldo ◽  
PA Boniface ◽  
DH Simmonds
Keyword(s):  
Cell Walls ◽  
Starch Granules ◽  
Fluorescent Staining ◽  
Frozen Sections ◽  
Wheat Grain ◽  
Ulex Europaeus ◽  
Abrus Precatorius ◽  
Nucellar Projection ◽  
Specific Reactions ◽  
Binding Lectin

Twelve fluorescein-labelled lectins with combining sites that collectively recognize a range of sugars were used as specific cytochemical probes to study both plastic-embedded and frozen sections of developing wheat grain. Specific reactions, inhibited by preincubation of lectin with sugars complementary to the specific combining sites, were observed with all of the lectins except the L- fucose-binding agglutinins from Lotus tetragonolobus and Ulex europaeus, and the N-acetyl-D-glucosamine-binding lectin from U. europaeus. Lectins from Canavalia ensiformis, Pisum sativum and Bandeiraea simplicifolia reacted with the starch granules. Potato and wheat-germ agglutinins, both of which bind N-acetyl-D-glucosamine, stained protein bodies. The latter lectin also reacted strongly with the nucellar epidermis in the immature grain. Four D-galactose-binding lectins from Abrus precatorius, Arachis hypogaea, Bandeiraea simplicifolia and Glycine max reacted with the cell walls of both the nucellar epidermis and the nucellar projection. Fluorescent staining of the nucellar epidermis was most uniform and intense at about 14 days post-anthesis (p.a.) and declined thereafter until it had completely disappeared by 35 days p.a. However, staining of the nucellar projection persisted throughout the period of examination.

scholarly journals Structure and histochemistry of sorghum caryopsis in relation to grain-filling

2020 ◽  
Vol 12 (4) ◽  
pp. 852-868
Author(s):  
S. RAVI SHANKAR ◽  
P. DAYANANDAN
Keyword(s):  
Single Layer ◽  
Grain Filling ◽  
Vascular Supply ◽  
Transfer Cells ◽  
Stages Of Development ◽  
Nucellar Projection ◽  
Wall Ingrowth ◽  
Vascular Parenchyma ◽  
C3 Grasses ◽  
Pigment Strand

Anatomical and histochemical studies of ovary and caryopsis of sorghum reveal the importance of the chalazal complex in transporting nutrients from maternal sources to the filial diploid embryo and triploid endosperm. The presence of starch, protein, lipid, Ca, K, Mg, and Fe in various tissues at different stages of development can be revealed by a variety of histochemical techniques. Vascular supply ends at the base of the ovary and transport occurs through vascular parenchyma, pigment strand and nucellar projection where symplastic continuity is broken. Nutrients unloaded into an apoplastic placental sac then enter the endosperm and embryo through the aleurone transfer cells. The later possess characteristic wall ingrowth. The single layer of aleurone surrounding the endosperm may also help in transport during later stages of grain-filling. Grain-filling in C4 sorghum is compared with other C4 and C3 grasses showing the variety of strategies evolved to transport nutrients into filial tissues. Standardization of terminologies to describe the tissues of the crease region will help in further research and communication.

Sucrose transport-related genes are expressed in both maternal and filial tissues of developing wheat grains

2000 ◽  
Vol 27 (11) ◽  
pp. 1009 ◽  
Author(s):  
Neil Bagnall ◽  
Xin-Ding Wang ◽  
Graham N. Scofield ◽  
Robert T. Furbank ◽  
Christina E. Offler ◽  
...  
Keyword(s):  
Membrane Transport ◽  
Plasma Membranes ◽  
Triticum Turgidum ◽  
Proton Pumping ◽  
Transfer Cells ◽  
Sucrose Transport ◽  
Wheat Grains ◽  
Nucellar Projection ◽  
Vascular Parenchyma ◽  
P Type

In developing wheat grains (Triticum turgidum var. durum cv. Fransawi), post-sieve element transport of phloem-imported photoassimilates (sucrose) includes membrane transport, to and from the grain apoplasm, between symplasmically-isolated maternal and filial tissues. The cellular location and mechanism of these membrane transport steps were explored during rapid grain fill. Genomic Southern analysis indicated the presence of a multigene family of sucrose/H + symporters (SUTs). One or more SUTs were highly expressed in developing grains, as were P-type H + /ATPase(s) and a sucrose binding protein (SBP). Transcripts of these genes were detected in vascular parenchyma, nucellar projection and aleurone cells. Antibodies, raised against a SUT, an H + /ATPase and a SBP, were selectively bound to plasma membranes of vascular parenchyma cells, nucellar projection transfer cells and modified aleurone/sub-aleurone transfer cells. The nucellar projection transfer cells and modified aleurone/sub-aleurone transfer cells exhibited strong proton pumping activity. In contrast, SUT transport function was restricted to filial tissues containing modified aleurone/sub-aleurone transfer cells. Based on these findings, we conclude that SUTs expressed in maternal tissues do not function as sucrose/H + symporters. Membrane exchange from nucellar projection transfer cells to the endosperm cavity occurs by an as yet unresolved mechanism. Sucrose uptake from the endosperm cavity into filial tissues is mediated by a SUT localised to plasma membranes of the modified aleurone/sub-aleurone transfer cells.

Pattern of endoproteolysis following wheat grain germination

1995 ◽  
Vol 95 (2) ◽  
pp. 253-259 ◽  
Author(s):  
Fernando Dominguez ◽  
Francisco J. Cejudo
Keyword(s):  
Wheat Grain

Quantitative evaluation of wheat grain glassiness by vision technique

2019 ◽  
pp. 52-55
Author(s):  
D. E. Troshkin ◽  
◽  
E.V. Gorbunov ◽  
A.A. Aleykchin ◽  
A.A. Gorbachyev ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Wheat Grain ◽  
Vision Technique

Influence of yellow rust on quality indicators of bread wheat grain (t. Aestivuml.)

2019 ◽  
Vol 326 (1) ◽  
pp. 158-161
Author(s):  
G.M. Hasanova ◽  
◽  
Kh.N. Rustamov ◽  
Keyword(s):  
Bread Wheat ◽  
Quality Indicators ◽  
Yellow Rust ◽  
Wheat Grain
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