Tagged: sugars

The experiment in progress

Interactive effects of prolonged drought and warming on plant growth and chemistry

Future shifts in precipitation regimes and temperature are expected to affect plant traits dramatically. To date, many studies have explored the effects of acute stresses, but few have investigated the consequences of prolonged shifts in climatic conditions on plant growth and chemistry. Orians and colleagues assessed plant size and metabolite profiles on naturally occurring Plantago lanceolata plants growing under different precipitation (ambient, 50 % less than ambient = drought) and temperature (ambient, +0.8, +2.4 and +4.0 °C above ambient) treatments at the Boston Area Climate Experiment (constructed in 2007). While the effect of warming on the metabolite profiles was less...

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Image: Wikimedia Commons.

Sugar versus Auxin: which is dominant?

Of the plethora of aspects of plant growth and development that the hormone (OK, plant growth regulator…) auxin is implicated in/involved with (e.g. embryo development, leaf formation, phototropism, gravitropism, fruit development, abscission, root initiation and development…), surely one of the most enduring is apical dominance. Apical dominance is the phenomenon whereby the outgrowth of buds on the side of a shoot is suppressed in favour of growth by the apical bud (hence its name…). Maintenance of this suppression has long been assumed to be due to the production of auxin by the apical bud and its transport down the stem, which effectively keeps the...

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Regulation of root morphogenesis in arbuscular mycorrhizae (Review)

Regulation of root morphogenesis in arbuscular mycorrhizae (Review)

Increased root branching is recognized as a general feature of arbuscular mycorrhizal (AM) roots, but a full understanding of the mechanisms involved is still lacking. Fusconi reviews the subject and concludes that fungal exudates are probably the main compounds regulating AM root morphogenesis during the first colonization steps, while a complex network of interactions governs root development in established AMs. The possible involvements of phosphate, which generally increases in AM plants, and of variations in sugar transport and in hormone homeostasis, signalling and interactions are also discussed.

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