نتایج جستجو برای: microspore viability

تعداد نتایج: 66375  

2009
Ugur Bal Sebnem Ellialtioglu Kazim Abak

A modification of a protocol used to induce tobacco microspore embryogenesis was tested in eggplant (Solanum melongena L.). In tobacco, uninucleate microspores are subjected to stress treatment by culturing in mannitol containing “B” medium at 33°C for six days. The microspores are then transferred to maltose containing AT3 medium for further development. In the experiment presented here late u...

Journal: :Current Biology 1998
Melissa Spielman

In flowering plants, male meiosis occurs in the microsporocyte to produce four microspores, each of which develops into a pollen grain. The image at top left is a transmission electron micrograph of a wild-type microspore from Arabidopsis thaliana, showing the single, central nucleus. The tetraspore (tes) mutant of Arabidopsis fails to undergo cytokinesis at the end of male meiosis and all four...

Journal: :The Plant cell 1992
D Worrall D L Hird R Hodge W Paul J Draper R Scott

Male sterility in a petunia cytoplasmic male sterile line has been attributed to the early appearance of active callase, a beta-1,3-glucanase, in the anther locule. This leads to premature dissolution of the callose walls surrounding the microsporogenous cells. We have mimicked this aspect of the petunia line in transgenic tobacco by engineering the secretion of a modified pathogenesis-related ...

Journal: :The Plant cell 2010
Hui Li Franck Pinot Vincent Sauveplane Danièle Werck-Reichhart Patrik Diehl Lukas Schreiber Rochus Franke Ping Zhang Liang Chen Yawei Gao Wanqi Liang Dabing Zhang

The anther cuticle and microspore exine act as protective barriers for the male gametophyte and pollen grain, but relatively little is known about the mechanisms underlying the biosynthesis of the monomers of which they are composed. We report here the isolation and characterization of a rice (Oryza sativa) male sterile mutant, cyp704B2, which exhibits a swollen sporophytic tapetal layer, abort...

Journal: :caspian journal of internal medicine 0
azin aghamajidi student research committee, babol university of medical sciences, babol, iran hesam babaei khameneh student research committee, babol university of medical sciences, babol, iran narges amirjamshidi student research committee, babol university of medical sciences, babol, iran zeinab abedian cellular and molecular biology research center, health research institute, babol university of medical sciences, babol, iran hamidreza khorasani ...cellular and molecular biology research center, health research institute, babol university of medical sciences, babol, iran amrollah mostafazadeh cellular and molecular biology research center, health research institute, babol university of medical sciences, babol, iran

background: similar to inflammatory cells, peripheral blood mononuclear cells (pbmcs) can also infiltrate in to kidney and urinary tracts and subsequently excreted by urine. in this study we determined the viability rate and response to phytohemagglutinin-a (pha) of human pbmcs in normal urine. methods: a number of 1×106 ficoll-hypaque isolated pbmcs were dispensed in 1 ml normal urine and 6 mo...

2015
Jose M. Seguí-Simarro

Doubled haploid (DH) technology is a powerful tool in plant breeding to reduce the time and costs needed to produce pure lines, the cornerstone of hybrid seed production. This biotechnological alternative to classic methods allows for a reduction of the typical 7–8 inbreeding generations needed to fix a hybrid genotype to only one in vitro generation. It is therefore much faster and cheaper, be...

Journal: :iranian journal of biotechnology 2007
amir mortazavian seyed hadi razavi mohammad reza ehsani sara sohrabvandi

worldwide popularity of probiotic- microorganisms and their products on the one hand, and their general weak viability in food products (especially fermented types) as well as gastrointestinal conditions on the other hand, has encouraged researchers to innovate different methods of probiotics viability improvement.  microencapsulation of the probiotic cells is one of the newest and highly effic...

Journal: :iranian journal of pharmaceutical research 0
mohammad rahmati roudsari skin research center, vice presidency of research and technology, shahid beheshti university of medical sciences, p.o. box 19395-4741, tehran, iran. sara sohrabvandi department of food technologyresearch, national nutrition and food technology research institute, shahid beheshti university of medical sciences, p.o. box 19395-4741, tehran, iran. aziz homayouni rad department of food science and technology, faculty of nutrition, tabriz university of medical sciences, tabriz, iran. amir mohammad mortazavian department of food science and technology, national nutrition and food technology research institute, faculty of nutrition sciences, food science and technology, shahid beheshti university of medical sciences, p.o. box 19395-4741, tehran, iran.

the combined effects of inoculation level (4 or 8-fold compared to standard inoculation) and sequence (standard inoculation before fermentation and 3-fold inoculation at the end of fermentation=1+3, two-fold inoculation before fermentation and the same at the end of fermentation=2+2, 2+6, 4-fold before fermentation=4, 4+4, and 8) of culture inoculum containing probiotics on biochemical and micr...

Journal: :international journal of advanced biological and biomedical research 2013
morad shaban

influences on viability and germination of seeds have been studied intensively for many years, particularly for the numer-ous commercially important agricultural, ornamental, and timber species. high germinating seed lots may differ substantially in field emergence when sown at the same time in the same field, and/or may differ in performance after storage in the same environment or transport t...

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