Stem cells are responsible for organogenesis, but it is largely unknown whether and how information from stem cells acts to direct organ patterning after organ primordia are formed. It has long been proposed that the stem cells at the plant shoot apex produce a signal, which promotes leaf adaxial-abaxial (dorsoventral) patterning. Here we show the existence of a transient low auxin zone in the adaxial domain of early leaf primordia. We also demonstrate that this adaxial low auxin domain contributes to leaf adaxial-abaxial patterning. The auxin signal is mediated by the auxin-responsive transcription factor MONOPTEROS (MP), whose constitutive activation in the adaxial domain promotes abaxial cell fate.

Plants adapt to their fluctuating environment by monitoring surrounding light conditions through several photoreceptors, such as phytochrome. It is widely believed that upon absorbing red light, phytochrome induces plant light responses by regulating the transcription of numerous target genes. In this study, we provide clear evidence that phytochrome controls not only transcription, but also alternative splicing in Arabidopsis.

Seasonal behavior is important for fitness in temperate environments but it is unclear how progeny gain their initial seasonal entrainment. Plants use temperature signals to measure time of year, and changes to life histories are therefore an important consequence of climate change. Here we show that in Arabidopsis the current and prior temperature experience of the mother plant is used to control germination of progeny seeds, via the activation of the florigen Flowering Locus T (FT) in fruit tissues.

Soybean cyst nematode (SCN, Heterodera glycines Ichinohe) is one of the most serious pests of soybean worldwide. PI 437655 has broader resistance to SCN HG types than PI 88788. The objectives of this study were to identify quantitative trait loci (QTL) underlying SCN resistance in PI 437655, and to evaluate the QTL for their contribution to SCN resistance. Two F_6:7 recombinant inbred line populations, derived from cv

Crop variety testing programs are conducted in many countries world-wide. Within each program, data are combined across locations and seasons, and analysed in order to provide information to assist growers in choosing the best varieties for their conditions. Despite major advances in the statistical analysis of multi-environment trial data, such methodology has not been adopted within national variety testing programs.

The terpenes are the largest class of plant natural products. This major class of compounds represents tremendous chemical diversity of which only a relatively small fraction has so far been accessed and used by industry. The primary drivers of terpene diversification are terpenoid synthases and cytochromes P450, which synthesize and modify terpene scaffolds.

The vacuole is the most prominent compartment in plant cells and is important for ion and protein storage. In our effort to search for key regulators in the plant vacuole sorting pathway, ribosomal large subunit 4 (rpl4d) was identified as a translational mutant defective in both vacuole trafficking and normal development. Polysome profiling of the rpl4d mutant showed reduction in polysome-bound mRNA compared with wild-type, but no significant change in the general mRNA distribution pattern.

Despite its importance, studies on the effect of transgenes in soybean (Glycine max (L.) Merr.) and the associated use of herbicides on biological nitrogen fixation (BNF) are relatively few. The transgenic soybean Cultivance CV127 contains the ahas gene, which confers resistance to imidazolinone herbicides. Mariangela Hungria of Embrapa Soja in Brazil, led a team of researchers in assessing the effects of the ahas transgene and of imidazolinone herbicide on BNF parameters and soybean yield.

Nucleotide sugars are donor substrates for the formation of glycan modifications, which are important for the function of many macromolecules such as proteins and lipids. Although most of the glycosylation reactions occur in the endoplasmic reticulum (ER) and Golgi of eukaryotic cells, nucleotide sugar activation occurs in the cytosol and specific transporters must carry these molecules across the membrane. We identified REPRESSOR OF CYTOKININ DEFICIENCY 1 (ROCK1) as an ER-localized transporter of UDP-GlcNAc and UDP-GalNAc in plants. In contrast to animals, nothing is known about the function of the two respective sugar residues in the plant ER

Obesity and associated metabolic disorders (e.g., cardiovascular disease and type 2 diabetes) are major public health concerns. These disorders result, in part, from hormonal dysregulation, particularly of glucocorticoids (GCs; central regulators of metabolism and adipogenesis). The specific mechanisms by which GCs modulate these processes remain largely unknown

Cassava (Manihot esculenta Crantz) is a major staple crop in Africa, Asia, and South America, and its starchy roots provide nourishment for 800 million people worldwide. Although native to South America, cassava was brought to Africa 400–500 years ago and is now widely cultivated across sub-Saharan Africa, but it is subject to biotic and abiotic stresses.

Banana is a climacteric fruit and has an ethylene dependent ripening. This makes postharvest ripening fast, shortening its postharvest life and resulting in huge losses. To better understand the mechanism of ripening, Mehar H. Asif and Prabodh K. Trivedi from the National Botanical Research Institute, Council of Scientific and Industrial Research and the Academy of Scientific and Innovative Research in India,

Drought stress induces the accumulation of the plant stress hormone abscisic acid (ABA). ABA then quickly activates the protein kinase OST1/SnRK2.6 to phosphorylate a number of proteins in guard cells, resulting in stomatal closure to reduce transpirational water loss. How SnRK2.6 is deactivated and how ABA signaling may be desensitized are unclear. This study found that nitric oxide (NO) resulting from ABA signaling causes S-nitrosylation of SnRK2.6 at a cysteine residue close to the kinase catalytic site, which blocks the kinase activity.

Researchers from University of Adelaide and Chinese Academy of Agricultural Sciences conducted a study which aims to improve soybean crop. They identified the gene necessary to enhance salt tolerance in soybean. By examining the gene sequences in different soybean varieties, they were able to identify and closely analyze GmSALT3. GmSALT3 is a salt tolerance gene in chromosome 3.

Climate and ecosystem changes in the Northeast Pacific decoupled primary and export productivity and organic carbon burial during climate warming of the last deglaciation. These findings challenge and clarify the meaning of paleoceanographic proxies of productivity and provide key constraints for modeling of the ocean’s biological pump as a potential carbon feedback mechanism associated with large-scale climate change. To our knowledge, this is the first clear demonstration that primary productivity, export productivity, and carbon burial are significantly decoupled under scenarios of large-scale climate change.

The emergence of human infection with a novel H7N9 avian influenza reassortant in China raises a pandemic concern. However, it is not fully understood how these H9N2 chicken viruses facilitated the genesis of the novel H7N9 viruses. Here we show that a “fittest” genotype (G57) emerged with changed antigenicity and improved adaptability in chickens. It became predominant in vaccinated farm chickens and caused widespread outbreaks before the H7N9 virus emergence

5-Hydroxymethylcytosine (5-hmC) is an intermediate in active demethylation in metazoans, as well as a potentially stable epigenetic mark. Previous reports investigating 5-hydroxymethylcytosine in plants have reached conflicting conclusions. We systematically investigated whether 5-hmC is present in plant DNA using a range of methods. Using the model organism Arabidopsis thaliana, in addition to other plant species, we assayed the amount or distribution of 5-hydroxymethylcytosine by thin-layer chromatography

Using leaf osmotic potential and plant survival rate as chilling‑tolerant trait indices, we iden‑ tified two major quantitative trait loci qLOP2 and qPSR2‑1 (39.3‑kb region) and Os02g0677300 as the cold‑inducible gene for these loci

Daily rhythms of gene expression ensure that biological processes occur at the optimal time of day. In plants, temporally regulated processes include traits of ecological and agricultural importance, and understanding how changes in daily rhythms of expression modify such traits has broad implications

DNA methylation, a chemical mark on chromatin, while not affecting DNA's primary sequence, plays important roles in silencing “bad DNA” that would become deleterious to cells if abnormally expressed. This DNA methylation-mediated silencing system against bad DNA is tightly regulated to prevent the misplacement of methylation on “good DNA.” In Arabidopsis thaliana,