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A multi-nucleate male-sterile mutant of maize with gametophytic expression (1997)

Sari-Gorla, M. ; Gatti, Emanuele ; Villa, Marzio ; [et al.]

Springer

Sexual plant reproduction 10 (1997), S. 22-26

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ISSN: 1432-2145

Keywords: Key words Maize ; Pollen ; Male sterility ; Gametophytic mutants

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract In order to dissect the complex genetic system that controls pollen development, we have undertaken a program of transposon insertion mutagenesis, with the purpose of producing mutations in gametophytically acting genes that are important for this process. The present work reports the developmental cytology of one of the mutants isolated, gaMS-2 (gametophytic male sterile-2). A peculiar feature of the mutant grains was lack of differentiation between the vegetative and the generative nuclei, leading to alteration in number, conformation and placement of nuclei. At anthesis, the grains carrying the mutant allele are about 40% of the normal grain size, contain a very reduced amount of starch and exhibit various nuclear abnormalities.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s004970050063

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Regiospecific Synthesis of 3,4-Disubstituted Furans and ThiophenesDedicated to Professor Xi-Kui Jiang, Shanghai Institute of Organic Chemistry, on the occasion of his 70th birthday. (1997)

Ye, Xin-Shan ; Yu, Pe ; Wong, Henry N. C.

Weinheim : Wiley-Blackwell

Liebigs Annalen 1997 (1997), S. 459-466

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ISSN: 0947-3440

Keywords: Furans ; Thiophens ; Palladium catalysis ; Coupling reactions ; Heterocycles ; Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The regiospecific synthesis of 3,4-disubstituted furans and thiophenes is reviewed. Our initial approach used 3,4-bis(tri-n-butylstannyl)furan as a building block, which led to many structurally diverse 3,4-disubstituted furans. Another avenue was explored by using 3,4-bis(trimethylsilyl)furan and 3,4-bis(trimethylsilyl)thiophene as precursors. A variety of unsymmetrically 3,4-disubstituted furans and thiophenes were prepared in this way. The advantages of our strategy lie in its stepwise manner as well as its prospect of yielding 3,4-disubstituted furans and thiophenes with rather different substitution pattern.

Additional Material: 5 Tab.