Compartmentalization of S-RNase and HT-B degradation in self-incompatible Nicotiana

Article Abstract:

Three events contributing to S-specific pollen recognition and rejection, S-RNase uptake and sequestration, an S-specific recognition step that affects HT-B stability and, in incompatible pollen, a self -reinforcing cytotoxic step that results in rejection, are recognized. Each step involves interactions between pollen and pistil factors and both S-RNase in an S-heterozygote contribute to rejection once the internal compartment breaks down.

Analysis, Physiological aspects, Pollination, Nicotiana, Palynology

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Evidence for ecology's role in speciation

Article Abstract:

The study represents that the parallel build-up of mating incompabilities between stickleback populations can be largely accounted for by assortative mating based on one trait, body size, which evolves predictably according to environment. The results of this study reveal that speciation may arise largely as a by-product of ecological differences and divergent selection on a small number of phenotypic traits.

Ecological balance, Environmental research, Environment

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Pillow talk in plants

Article Abstract:

Flowering plants have a sophisticated mating imperatives just like humans, but they lack sensory faculties, are largely immobile, and rely on the vagaries of factors such as wind or insects to assist mating. An opportunity for a two-sided conversation in which a decision can be made about whether pollen should be accepted or rejected is presented.

Angiosperms

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