Download The Pollen Tube: A Cellular and Molecular Perspective by Rui Malhó (auth.), Rui Malhó (eds.) PDF

By Rui Malhó (auth.), Rui Malhó (eds.)

The huge, immense quantity of knowledge now on hand concerning the pollen tube essentially displays its features as a organic version that cross a lot past that of a service of sperm cells crucial for plant copy. the range of concepts and methodologies presently used to review pollen and pollen tube progress is mirrored during this ebook written by means of biochemists, mobile biologists, molecular biologists and geneticists. Their diverse views show that pollen tubes are very good types for plant phone learn, rather compatible for investigations on cellphone tip development and polarization, sign transduction, channel and ion flux job, gene expression, cytoskeleton and wall constitution, membrane dynamics or even cell–cell communication.

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2004a,b; Procissi et al. 2001). Morphological screens are labor intensive, but have proven effective in the identification of several important mutants with novel phenotypes (Table 1). These include mutants that disturb asymmetric cell division at pollen mitosis I (Chen and McCormick 1996; Twell et al. 1998, 2002; Oh et al. 2005), generative cell division (Grini et al. 1999; Durbarry and Twell 2005; Rotman et al. 2005), generative cell migration (Howden et al. 1998), the positioning and structure of the male germ unit (Lalanne and Twell 2002), callose wall deposition and the repression of pollen germination within the anther (Johnson and McCormick 2001).

DUO1 was recently identified as a novel R2R3 MYB protein specifically expressed in generative and sperm cells (Rotman et al. 2005). DUO1 represents the first germ line specific regulator to be identified and DUO1 homologues in maize, rice and tobacco all possess a supernumerary lysine signature in the R3 MYB domain that defines the DUO1 family (Rotman et al. 2005). Mutant generative cells in duo1 pollen fail to enter PMII and enter a partial endocycle, suggesting that DUO1 may be a specific regulator of genes required for G2 to M-phase transition (Durbarry et al.

Some transcription factors and receptor proteins), we can expect many gametophytic genes with important functions to be relatively highly expressed. The contribution of such genes is more easily visualized when only mRNAs forming the high-abundance class5 are considered (2197 genes). Within the high abundance class, genes involved in protein synthesis are again the most numerous (15% of all 2197 genes) and the most highly expressed (25% of overall signal intensity). The increase of other over-represented functional categories (metabolism, protein fate) was less dramatic with only a 1–3% increase in gene number and signal intensity.

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