Tagged: germination








How does variation in traits of Tunisian oak seeds affect survival?

Oaks are the dominant species of tree in many Mediterranean forests. However, the climate of the Mediterranean basin is predicted to change dramatically. Will the make-up of the forests change similarly? To find out, Nabil Amimi and colleagues have been examining the ecophysiology of seed persistence and germination in Tunisian oaks. There are a number of oaks in Tunisia. The authors compared Quercus canariensis, Q. coccifera, Q. ilex and Q. suber. Normally, altitude, rainfall and temperature give each oak its favoured niche. “It is well established that Q. coccifera becomes dominant under warm and arid conditions. At the opposite end...

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A conceptual diagram of the processes studied

Integration between developmental pathways during reserve mobilization in palm seeds

Palm seeds are interesting models for studying seed reserve mobilization at the tissue level due to the abundance and complexity of reserves stored in their living endosperm cells and the development of a highly specialized haustorium. Dias et al. studied structural and physiological aspects of the initial phases of reserve mobilization in seeds of a neotropical palm, Butia capitata, and sought to characterize the interactions between the different developmental pathways of the haustorium and endosperm. The authors performed morphological and histochemical evaluations of the haustorium, the endosperm adjacent to the embryo, and the peripheral endosperm of dry, imbibed, dormant seeds...

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Effect of maturation under white light, a neutral filter and a green filter on germination of seeds

Within- and trans-generational plasticity: seed germination responses to light quantity and quality

Plants respond not only to the environment in which they find themselves, but also to that of their parents. The combination of within- and trans-generational phenotypic plasticity regulates plant development. The light environment also regulates many aspects of plant development, including seed germination. In a recent study published in AoB PLANTS, Vayda et al. investigate how seeds integrate environmental cues experienced at different times. In the study the authors quantified germination responses to changes in light quantity (irradiance) and quality (R:FR) experienced during seed maturation and seed imbibition in Arabidopsis thaliana genotypes that differ in their innate dormancy levels. The results...

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Intra-specific facilitation promotes the recruitment of a desert shrub

In stressful environments, nurse elements, such as shrubs or rocks, facilitate plant recruitment by providing less severe environments for seed germination and seedling survival. As seedlings develop, however, they may compete for resources with their nurse when it is a plant instead of a rock. In a recent study published in AoB PLANTS, Loayza et al. examined the role of conspecific plants and rocks as nurses of an endangered Atacama-Desert shrub, Myrcianthes coquimbensis (Myrtaceae). Establishment was highest under conspecific plants, revealing that in stressful environments plants can facilitate establishment of their own species. Their study contrasts with findings from other...

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Plant records: Can a plant be too trusting?

Name: Orchids Scientific name: Family: Orchidaceae Known for: Beauty, epiphytism, providing vanilla flavouring, tiny seeds, mycorrhizae, deceptive pollination, mycoheterotrophy, medicinal usage, vegetating Krakatoa… Record broken: The world’s most trusting plant… The orchid family, the Orchidaceae, is one of the biggest flowering plant families with an estimated number of species ranging from 26,460 [Maarten Christenhusz et al.,‎ Plants of the World: An Illustrated Encyclopedia of Vascular Plants; University of Chicago Press, 2017] to >27,000]. Whilst that arguably means that there can be almost 27,000 unique ways to be an orchid, this item will have to restrict itself to generalisations. In particular,...

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