Plant Biology Newsfeeds
-
EXO70A1-Mediated Vesicle Trafficking Is Critical for Tracheary Element Development in Arabidopsis
Plant Cell Advance Online Publication Papers 24 May 2013 | 10:10 amGenes encoding for EXO70, a component of the exocyst complex, are highly expanded in plant genomes, with reasons unknown. EXO70A1 expressed primarily in tracheary elements regulates vesicle trafficking during xylem formation, suggesting that individual EXO70 members in plants may act in cell type– or cargo-specific exocytosis.
-
Fungal-specific transcription factor AbPf2 activates pathogenicity in Alternaria brassicicola
The Plant Journal 24 May 2013 | 1:05 amSummary Alternaria brassicicola is a successful saprophyte and necrotrophic plant pathogen. To identify molecular determinants of pathogenicity, we created non-pathogenic mutants of a transcription factor-encoding gene, AbPf2. The frequency and timing of germination and appressorium formation on host plants were similar between the non-pathogenic ∆abpf2 mutants and wild-type A. brassicicola. The mutants were also similar in vitro to wild-type A. brassicicola in terms of vegetative growth, conidium production, and responses to a phytoalexin, reactive oxygen species and osmolites. The hyphae of the[…]
-
PYR/RCAR Receptors Contribute to Ozone-, Reduced Air Humidity-, Darkness- and CO2-Induced Stomatal Regulation
Plant Physiology Preview Papers 23 May 2013 | 3:00 pmRapid stomatal closure induced by changes in the environment, such as elevation of CO2, reduction of air humidity, darkness and pulses of air pollutant ozone (O3), involves the SLAC1 anion channel. SLAC1 is activated by OST1 and Ca2+-dependent protein kinases. OST1 activation is controlled through abscisic acid (ABA)-induced inhibition of PP2C protein phosphatases by PYR/RCAR receptor proteins. To address the role of signaling through PYR/RCARs for whole-plant steady-state stomatal conductance (gst) and stomatal closure induced by environmental factors, we used[…]
-
Perception of low red:far-red ratio compromises both salicylic acid- and jasmonic acid-dependent pathogen defences in Arabidopsis
The Plant Journal 22 May 2013 | 11:50 amSummary In dense stands of plants, such as agricultural monocultures, plants are exposed simultaneously to competition for light and other stresses such as pathogen infection. Here, we show that both salicylic acid (SA)-dependent and jasmonic acid (JA)-dependent disease resistance is inhibited by a simultaneously reduced red:far-red light ratio (R:FR), the early warning signal for plant competition. Conversely, SA- and JA-dependent induced defences did not affect shade-avoidance responses to low R:FR. Reduced pathogen resistance by low R:FR was accompanied by a[…]
-
SPL8 and miR156-targeted SPL genes redundantly regulate Arabidopsis gynoecium differential patterning
The Plant Journal 22 May 2013 | 11:47 amSummary SPL8 and miR156-targeted SPL genes are known to play an essential role in Arabidopsis anther development. Here we show that these SPL genes are also expressed within the developing gynoecium, where they redundantly control development of the female reproductive tract. Whereas the gynoecium morphology in the spl8 single mutant is largely normal, additional down-regulation of miR156-targeted SPL genes results in a shortened style and an apically swollen ovary narrowing onto an elongated gynophore. In particular, the septum does not[…]
-
A TIR–NBS protein encoded by Arabidopsis Chilling Sensitive 1 (CHS1) limits chloroplast damage and cell death at low temperature
The Plant Journal 22 May 2013 | 11:07 amSummary Survival of plants at low temperature depends on mechanisms for limiting physiological damage and maintaining growth. We mapped the chs1-1 (chilling sensitive1-1) mutation in Arabidopsis accession Columbia to the TIR-NBS gene At1g17610. In chs1-1, a single amino acid exchange at the CHS1 N-terminus close to the conserved TIR domain creates a stable mutant protein that fails to protect leaves against chilling stress. The sequence of another TIR-NBS gene (At5g40090) named CHL1 (CHS1-like 1) is related to that of CHS1. Over-expression[…]
-
Functional implication of {beta}-carotene hydroxylases in soybean nodulation
Plant Physiology Preview Papers 22 May 2013 | 10:10 amLegume-Rhizobium symbiosis requires signaling between the symbiotic partners, chemical communication between shoot and root, and differential expression of plant genes during nodule development. Previously we cloned a gene encoding a putative β-carotene hydroxylase (BCH) from soybean (Glycine max) whose expression increased during nodulation with Bradyrhizobium japonicum. In the present work we examined its possible role in nodule development. In situ hybridization revealed the expression of three GmBCHs (GmBCH1, GmBCH2, and GmBCH3) in the infected cells of root nodules, and their[…]
-
The Arabidopsis RING E3 Ubiquitin Ligase AtAIRP3/LOG2 Participates in Positive Regulation of High Salt and Drought Stress Responses
Plant Physiology Preview Papers 21 May 2013 | 1:01 pmRING E3 ubiquitin (Ub) ligases have been implicated in cellular response to the stress hormone abscisic acid (ABA) as well as to environmental stresses in higher plants. Here, an atairp3 (Arabidopsis thaliana ABA insensitive RING protein 3) loss-of-function mutant line was isolated due to its hyposensitivity to ABA during its germination stage as compared to wild-type plants. AtAIRP3 contains a single C3HC4-type RING motif, a putative myristoylation site, and a DAR2 domain. Unexpectedly, AtAIRP3 was identified as LOG2 (Loss of[…]
-
A methyltransferase essential for the methoxypyrazine-derived flavour of wine
The Plant Journal 21 May 2013 | 6:01 amSummary Methoxypyrazines are a family of potent volatile compounds of diverse biological significance. They are used by insects and plants in chemical defence, are present in many vegetables and fruit and, in particular, impart herbaceous/green/vegetal sensory attributes to wines of certain varieties, including Cabernet Sauvignon. While pathways for methoxypyrazine biosynthesis have been postulated, none of the steps have been confirmed genetically. We have used the F2 progeny of a cross between a rapid flowering grapevine dwarf mutant, which does not[…]
-
Regulation of transcription of NB-LRR-encoding genes SNC1 and RPP4 via H3K4 tri-methylation
Plant Physiology Preview Papers 20 May 2013 | 9:19 amPlant nucleotide-binding leucine-rich repeat (NB-LRR) proteins serve as intracellular sensors to detect pathogen effectors and trigger immune responses. Transcription of the NB-LRR-encoding Resistance (R) genes needs to be tightly controlled to avoid inappropriate defense activation. How the expression of the NB-LRR R genes is regulated is poorly understood. The Arabidopsis snc1 mutant carries a gain-of-function mutation in a TIR-NB-LRR-encoding gene, resulting in the constitutive activation of plant defence responses. A snc1 suppressor screen identified modifier of snc1, 9 (mos9), which[…]
Phone: +1 516.367.6872
Email:
This email address is being protected from spambots. You need JavaScript enabled to view it.
Instant Messenger: Online Librarian
Our librarians are here to assist you, whether you need to research a particular topic, obtain an article or book by inter-library loan, make color copies, or use any of the other services offered by the CSHL Library.
