Posted in Biotechnology

Download Biotechnology and Ecology of Pollen: Proceedings of the by M. B. Singh, R. B. Knox (auth.), David L. Mulcahy, Gabriella PDF

By M. B. Singh, R. B. Knox (auth.), David L. Mulcahy, Gabriella Bergamini Mulcahy, Ercole Ottaviano (eds.)

In acceptance of the Forgotten new release D. L. MULCAHyl Pollen was once lengthy believed to serve essentially a unmarried functionality, that of providing male gametes to the egge A secondary and usually ignored worth of pollen is that it serves to dam the transmission of many faulty alleles and gene combos into the subsequent iteration. This latter functionality comes approximately just because pollen tubes sporting faulty haploid genotypes usually fail to accomplish development in the course of the complete size of the fashion. despite the fact that, the worthy outcomes of this pollen choice are diluted through the truth that a similar deleterious genotypes are frequently transmitted in the course of the egg at strictly mendelian frequencies (Khush, 1973). Gene expression within the pollen may possibly therefore not less than seem to be a phenomenon of trivial final result. certainly, Heslop-Harrison (1979) rightly termed the gametophytic section of the angiosperm existence cycle, the "forgotten generation." This forget, although, happened regardless of sophisticated yet consistent symptoms that pollen is the location of excessive gene job and choice. for instance, Mok and Peloquin (1975) verified that particularly heterozygous diploid pollen indicates heterotic features while particularly homozygous diploid pOllen doesn't. This was once facts confident that genes are expressed (that is, transcribed and translated) within the pollen. 1 division of Botany, college of Massachusetts Amherst, MA 01003, united states viii besides the fact that, the results for pollen biology of even this fresh and popular examine weren't commonly recognized.

Show description

Read or Download Biotechnology and Ecology of Pollen: Proceedings of the International Conference on the Biotechnology and Ecology of Pollen, 9–11 July, 1985, University of Massachusetts, Amherst, MA, USA PDF

Best biotechnology books

A Many-Colored Glass: Reflections on the Place of Life in the Universe

Freeman Dyson’s most modern e-book doesn't try to compile all the celebrated physicist’s innovations on technological know-how and expertise right into a unified idea. The emphasis is, in its place, at the myriad ways that the universe offers itself to us--and how, as observers and members in its approaches, we reply to it.

New Market Intelligence: Identifizieren und Evaluieren von Auslandsmärkten für Dienstleistungen in der roten Biotechnologie

Ausgehend von einer systematischen Bestandsaufnahme in der roten Biotechnologie und 30 Fallstudien leiten die Autoren Managementempfehlungen für das Vorgehen in der strategischen Vorausschau neuer Märkte und Geschäftsmöglichkeiten ab und geben einen Überblick über Geschäftsmöglichkeiten und Markteintrittsbarrieren für deutsche Biotechnologieunternehmen in Asien und in Singapur.

Handbook of Marine Macroalgae: Biotechnology and Applied Phycology

The guide of Macroalgae: Biotechnology and utilized Phycology describes the organic, biotechnological and the commercial purposes of seaweeds. mammoth learn into the cultivation of seaweeds is presently being undertaken yet there's a loss of methodological thoughts in position to increase novel medications from those assets.

Additional resources for Biotechnology and Ecology of Pollen: Proceedings of the International Conference on the Biotechnology and Ecology of Pollen, 9–11 July, 1985, University of Massachusetts, Amherst, MA, USA

Example text

This estimate agrees with data obtained by Willing and Mascarenhas by mRNA analysis in Tradescantia (13) and co rn (4), and by Tanksley in tomate (11). Information about mechanisms and genes involved in regulation of gametophytic gene expression is not yet available. However, it can be concluded that a large part of the genome is expressed in the haploid phase and of this a good portion is common to the sporophyte. The extensive overlap between gametophytic and sporophytic phases may constitue the biological basis of the observed sporophytic responses to gametophytic selection and thus may have been a significant factor in the evolution of the Angiosperms (6).

The results are summarized in table 1. Table 1. EFFECTS OF GAMETOPHYTIC RECURRENT SELECTION Families from mean 1 ) BASE POPUL. 31 2) APEX POPUL. 53 11. 02 11. 68 n . s . 04 n . s . 05) . The mean value of gametophytic competitive ability in the progeny produced at higher selection intensity is higher than that of the progeny produced at low selection intensity, showing that the variability of the character is largely based on genes expressed in the gametophytic phase. Sporophytic effects could also play an important role; however, considering the selection procedure used, they should not contribute to the selection response obtained.

During this phase, expecially in trinucleate pollen, many i~portant metabolie processes relating to germination and pollen tube growth are concluded. Thus one could suppose that the response to environmental stresses woul{ be critical in this stage of pollen life, and influence competitive ability during the fertilization process. Dipartimento di Biolog"ia, Sezione di Genetica e :ücrobiologia, Via Celoria 26 - 20133 ilUlano, Italy, tel. 23. 34 In this charter we report data showing that hsp's are induced, at different stages of pollen grain development.

Download PDF sample

Rated 4.83 of 5 – based on 9 votes