DELLA genes restrict inflorescence meristem function independently of plant height
Blog, Plant Science Research Weekly, Research, Research BlogGibberellins (GA) have a role in cell proliferation in the shoot apical meristem (SAM). GA binds to the receptor GID1, leading to DELLA protein degradation, thus promoting stem growth. In absence of GA, DELLAs inhibit growth. In this paper, Serrano-Mislata et al. explore how DELLAs, mainly GAI and RGA,…
Brassinosteroid signaling-dependent root responses to prolonged elevated ambient temperature
Blog, Plant Science Research Weekly, Research, Research BlogTemperature is one of the major factors affecting plant growth and development. Martins et al. showed that elevated temperature increases root growth through elongated cell size, but reduced both meristem size and number of meristematic cells. The elongation of root growth during elevated temperature…
In Arabidopsis thaliana cadmium affects growth of the primary root by altering SCR expression and auxin-cytokinin crosstalk
Blog, Plant Science Research Weekly, Research, Research BlogCadmium is a toxic metal in our environment. Bruno et al. explored cadmium-mediated root-growth inhibition using the model plant Arabidopsis thaliana. Cadmium affects root growth longitudinally by reducing root meristem cell number and radially by controlling the number and width of stele cells. The…
Review: Auxin signaling
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Leyser summarizes our current understanding of the what, how and why of what auxin does (and doesn’t) do. For example, she points out that, “Auxin does not instruct cells to do anything in particular, but rather it influences the behavior of cells according to their pre-existing identity.” She…
Genetic architecture and molecular networks underlying leaf thickness in desert-adapted tomato
Blog, Plant Science Research Weekly, Research, Research BlogPlants with thicker leaves are better able to retain water and deal with water-limiting conditions. Coneva et al. explored the genetic basis for leaf thickness by comparing introgression lines of cultivated tomato (Solanum lycopersicum) and a species adapted to the desert (Solanum pennillii). They found…
J. Exp. Bot. reviews auxin ($)
Blog, Plant Science Research Weekly, Research, Research BlogThe Journal of Experimental Botany is publishing a good collection of review articles on auxin. Topics include ARF transcription factors, Auxin’s role in lateral root formation, Auxin research in rice and implications for crop improvement, Integration of multiple auxin signaling pathways, Evolution…
Rhamnose-containing cell wall polymers suppress helical plant growth independently of microtubule orientation
Blog, Plant Science Research Weekly, Research, Research BlogSaffer et al. identified an Arabidpsis mutant with swirled petals and with petal epidermal cells that show a left-handed (but never right-handed) twist. They mapped the mutation to the RHAMNOSE BIOSYNTHESIS1 (RHM1) gene, which is most highly expressed in petal epidermal cells and encodes an enzyme that…
Flowering time in banana (Musa spp.), a day neutral plant, is controlled by at least three FLOWERING LOCUS T homologues
Blog, Plant Science Research Weekly, Research, Research BlogFlowering time is regulated by FLOWERING LOCUS T (FT), its paralog TWIN SISTER OF FT (TSF), and related proteins. Banana (Musa spp.) is an economically-important day-neutral plant with a months-long vegetative phase prior to flowering. The banana cultivar Grand Nain has 14 FT/TSF-like genes spread…
A MicroRNA Switch that Controls Lateral Root Growth and Nodulation
Plant Physiology, Plant Physiology: On The Inside, Research, Research BlogLegume roots form two types of organs, lateral roots and symbiotic nodules, which participate, respectively, in the uptake of water and mineral nutrients and in nitrogen fixation. Since both organs have considerable impacts on plant growth, understanding the mechanisms underlying the development of lateral…