In order to get an insight in the transcriptomic changes underlying the phenotypic differences induced by the distinct N fertilization treatments, the xylem tissues of 20 young trees of E. urophylla × E. grandis were sampled and pooled for each N treatment (N-, N, N + and NO3).
Because distinct SFPs affect male fertilization success in females of different age [ 39], we estimated both short- and long-term effects.
Orthodox seed (Roberts, 1973) development typically may be divided into three distinct phases following ovule fertilization: histodifferentiation, during which embryonic tissues are formed; seed filling, when reserve deposition takes place; and maturation drying, characterized by water loss and reduced metabolism (Kermode et al., 1986; Bewley and Black, 1994).
These results provide strong evidence for niche differentiation of phylogenetically distinct AMF populations under different fertilization regimes.
This fusion allows the joining of two distinct structures as in the fertilization of an egg by sperm or the entry of a virus into a cell.
As argued by Bedford (1, 34), eutherian mammals appear to have developed a fertilization strategy quite distinct from that described for marine invertebrates, and its evolution seems to have been determined by the small alecithal egg intolerant to polyspermy.
We propose that presence of alternative fertilization environments with distinct characteristics (i.e. internal or external), whether or not in combination with the effects of sperm competition, can drive the disruptive evolution of sperm size.
SPA evaluates sperm function capacity by examining sperm competence in distinct biological processes required for fertilization; capacitation, acrosome reaction, spontaneous recognition of and fusion with vitelline membrane to the end-point of chromatin decondensation [ 13].
We would like to add the role of the New Ballard Scoring and, as they may help clinch the diagnosis, even where suggestive fortuitous circumstances as in this case (distinct marker separating the two fertilizations in the form of bleeding on implantation of first ovum) are not available.
In flowering plants, the specification of cells destined to enter meiosis occurs late in development, gametic and accessory cells are usually derived from the same meiotic product, and two distinct female gametes involved in double fertilization differentiate.
