annals-of-botany
The assertion that plants at lower latitudes should be better defended against enemies has a long historical basis but is still controversial. In the current study,
annals-of-botany
Heteroblastic species show an abrupt change in morphology at a fixed ontogenetic stage, and are relatively frequent in Mediterranean type ecosystems with regular fires. Using the
annals-of-botany
Plants take up and assimilate nitrogen (N) in the form of nitrate (NO3–) or ammonium (NH4+), or a combination of both. When oxygen availability is reduced
annals-of-botany
Guard cell walls are built to resist bending and deformation to open and close the pore. Pectins provide flexibility and resilience to walls; in particular arabinans
annals-of-botany
Global warming threatens species living in the highest and coldest areas. Alpine cushion plants are potentially endangered by stronger species expanding from lower elevations. This can
annals-of-botany
Evolution of large flowers and associated specialized pollination mechanisms may increase the genetic relatedness of seeds within multi-ovulate ovaries by pollination of all ovules by
annals-of-botany
Where do you find plants? Sometimes it seems the clue is in the name. For example, anyone looking for the Radnor Lily in the UK will
annals-of-botany
Most bladderworts (genera Pinguicula, Genlisea, Utricularia, Lentibulariaceae) are pollinated by insects. Bird pollination is rare and has probably evolved independently three times in this family. In
annals-of-botany
Enantiostyly, a reproductive system characterized by heteromorphic flowers with either left or right style deflection, compels reciprocal pollen transfer between floral types. The potential outcrossing advantage
annals-of-botany
Diverse breeding systems have evolved in angiosperms from the bisexual flowers of their last common ancestor. However, breeding system evolution remains poorly understood in many plant
annals-of-botany
Submergence is a severe stress for most plants. Striker et al. assess tolerances of partial and full submergence for fifteen accessions of Melilotus siculus (Fabaceae). Traits
annals-of-botany
One major and long-standing controversy in conifer evolution concerns the phylogenetic relationships in the subfamily Cupressoideae (Cupressaceae) between Juniperus, Cupressus and the Hesperocyparis-Callitropsis-Xanthocyparis