By Dreux de Nettancourt
Advances in plant mobile molecular biology have significantly elevated our knowing of pollen-pistil limitations, really these operated through incompatibility mechanisms, and, while, proven the complexity and variety of rejection platforms as soon as thought of to be rather basic. This publication stories the notable wisdom obtained within the final century at the biology, quite the inheritance and inhabitants genetics of self-incompatibility, and offers the hot methods to the learn of the constitution, functionality and evolution of incompatibility alleles and the research of cell-cell popularity and pollen rejection. different tools now on hand for reworking the breeding behaviour of upper vegetation also are discussed.
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Extra info for Incompatibility and Incongruity in Wild and Cultivated Plants
Sample text
Segregations for pin and thrum (distylic system) and long, mid and short (tristyly) after compatible mating. (de Nettancourt 1972) sists of two classes of self-incompatible individuals that are reciprocally cross-compatible between classes and cross-incompatible within each class (Fig. 1). If there are no selective disadvantages operating against one of the two phenotypes, the progenies of cross-compatible plants will again consist of two phenotypic classes, pin and thrum, which are present in equal proportions (isoplethy).
The rationale of Brewbaker is essentially based on the strong relationship between the stage at which the second mitotic division (pollen or pollen tube) and the site of the incompatibility reaction (style or stigma). The growth of pollen tubes depends on certain concentrations of a pollen growth factor, which is exhausted at the time of the second mitosis and can no longer be produced, utilized or transferred to the pollen in the case of an incompatible mating (Brewbaker and Majunder 1961). Of course, the techniques available at the beginning of the year 2000 enable us to time gene action during microsporogenesis, pollen maturation and pollen growth.
According to Roberts et al. (l980), the basic response in Brassica after the recognition reaction, is the failure of pollen hydration, from which all other manifestations of SI result. Ikeda et al. (1997) consider that this inhibition of water supply, which occurs immediately after a kinase receptor has received a diffusible signal from the pollen coat, could be the consequence of the intervention of an activated aquaporin-related gene (Sects. 2). Function losses affecting this gene prevent rejection and the expression of SI.