Pollen and coenocytic microspore germination in male-fertile and malesterilemsl soybean     

L. F. Chen  M. C. Albertsen  R. G. Palmer 《Euphytica》1987,36(1):333-343

Summary Light and fluorescence microscopy were used to study coenocytic microspore germination from male-sterile (ms1 ms1) soybean plants. Anther squashes from male-sterile plants revealed that a low frequency of natural coenocytic microspore germination occurred in male-sterile anthers of four independent lines; [ms1-North carolina (T260H),ms1-Urbana (T266H),ms1-Tonica (T267H), andms1-Ames (T268H)]. Abnormalities such as giant tubes, branched tubes, tubes with swollen areas, and multiple tubes were observed from coenocytic microspores from all four lines. The Urbana line, however, demonstrated a higher percentage of coenocytic microspore germination than did the other three lines. Flowers of the Urbana line from both malefertile and male-sterile plants, as well as gynoecia pollinated with coenocytic microspores from sterile plants, were used for in vivo studies. Pollen-tube growth appeared normal in male-fertile plants. In contrast, coenocytic microspore tubes rarely were observed in gynoecia from male-sterile plants or in gynoecia from malefertile plants that had been artificially cross-pollinated withms1 ms1 plants. Few tubes from coenocytic microspores were observed in the vicinity of the micropylar region. A low frequency of seed set was achieved in the greenhouse on Urbana male-sterile plants grown in the absence of male-fertile plants. Thus, we believe either that some gametes from coenocytic microspores are able to participate in fertilization at low frequency or that apomixis occurs inms1 ms1 plants.Joint contribution: Agricultural Research Service, U.S. Department of Agriculture, and Journal Paper No. J-12310 of the Iowa Agriculture and Home Economics Experiment Station, Ames IA, 50011 USA. Project 2471.  相似文献   

A partially male-sterile mutant line of soybeans,Glycine max (L.) Merr.: inheritance     

David M. Stelly  Reid G. Palmer 《Euphytica》1980,29(2):295-303

Summary A partial male sterility system in the soybean (Glycine max (L.) Merr.) germplasm population AP6(SI)CI was found to be controlled monogenically by a recessive allele, msp. Observations of msp msp plants in different environments suggested that environmental conditions significantly affect expressivity of the msp allele with respect to male sterility. We obtained no experimental evidence of cytoplasmic effects on msp expression. Background genotypes, however, seem to affect msp expressivity through their determination of flowering dates and resultant interactions with varying environmental conditions.Homogeneous populations of partially male-sterile plants can be generated by increasing families of msp msp plants in fertility-inducing environments, if measures are implemented to prevent the introduction and/or build-up of fertile genotypes that arise from natural cross-pollinations.Joint contribution: North Central Region, Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, and Journal Paper No. J-9596 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa 50011; Project 2107.  相似文献   

Residues of chlorophenoxy acid herbicides and their phenolic metabolites in tissues of sheep and cattle.     

D E Clark  J S Palmer  R D Radeleff  H R Crookshank  F M Farr 《Journal of agricultural and food chemistry》1975,23(3):573-578

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Requirement for cotolerogenic gene products in the clonal deletion of I-E reactive T cells   总被引：22，自引：0，他引：22  

D Woodland  M P Happ  J Bill  E Palmer 《Science (New York, N.Y.)》1990,247(4945):964-967

T cells that express the T cell receptor V beta 5.2 domain react with the class II major histocompatibility complex (MHC) molecule I-E, and V beta 5.2+ T cells are deleted in mouse strains that express I-E glycoproteins. By examination of genetically defined recombinant inbred (RI) mouse strains, it was found that the deletion was dependent on the expression of I-E and one of a limited number of non-MHC gene products (cotolerogens). The gene encoding one of these cotolerogens maps to chromosome 12 and is linked to the endogenous provirus Mtv-9. These observations suggest that the I-E-mediated and minor lymphocyte-stimulating antigen (Mls)-mediated deletions of alpha beta T cells from the repertoire are similar; both require the expression of a class II MHC glycoprotein and a second non-MHC gene product.  相似文献   

Disordered systems     

Palmer RG 《Science (New York, N.Y.)》1980,208(4447):1025

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Nuclear safety. Brazil's nuclear puzzle     

Palmer L  Milhollin G 《Science (New York, N.Y.)》2004,306(5696):617

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URONIC ACIDS IN ANIMAL BODIES     

Baier WE  Bryant EF  Joseph GH  Palmer GH 《Science (New York, N.Y.)》1945,101(2635):670-671

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REVERSAL OF THE SODIUM LINE     

Palmer CS 《Science (New York, N.Y.)》1920,52(1338):176-177

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A trap-door spider at work     

Palmer MT 《Science (New York, N.Y.)》1886,7(162):240-241

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NANSEN'S DISCOVERY OF THE BREEDING GROUNDS OF THE ROSY GULL     

Palmer TS 《Science (New York, N.Y.)》1897,5(109):175-176

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