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Mieke de Wit, Karin Ljung, Christian Fankhauser
Foliar shade triggers rapid growth of specific structures that facilitate access of the plant to direct sunlight. In leaves of many plant species, this growth response is complex because, although shade triggers the elongation of petioles, it reduces the growth of the lamina. How the same external cue leads to these contrasting growth responses in different parts of the leaf is not understood. Using mutant analysis, pharmacological treatment and gene expression analyses, we investigated the role of PHYTOCHROME INTERACTING FACTOR7 (PIF7) and the growth-promoting hormone auxin in these contrasting leaf growth responses...
October 2015: New Phytologist
Julien Lavenus, Tatsuaki Goh, Soazig Guyomarc'h, Kristine Hill, Mikael Lucas, Ute Voß, Kim Kenobi, Michael H Wilson, Etienne Farcot, Gretchen Hagen, Thomas J Guilfoyle, Hidehiro Fukaki, Laurent Laplaze, Malcolm J Bennett
A large number of genes involved in lateral root (LR) organogenesis have been identified over the last decade using forward and reverse genetic approaches in Arabidopsis thaliana. Nevertheless, how these genes interact to form a LR regulatory network largely remains to be elucidated. In this study, we developed a time-delay correlation algorithm (TDCor) to infer the gene regulatory network (GRN) controlling LR primordium initiation and patterning in Arabidopsis from a time-series transcriptomic data set. The predicted network topology links the very early-activated genes involved in LR initiation to later expressed cell identity markers through a multistep genetic cascade exhibiting both positive and negative feedback loops...
May 2015: Plant Cell
Aditi Gupta, Manjul Singh, Ashverya Laxmi
Glucose (Glc) plays a fundamental role in regulating lateral root (LR) development as well as LR emergence. In this study, we show that brassinosteroid (BR) signaling works downstream of Glc in controlling LR production/emergence in Arabidopsis (Arabidopsis thaliana) seedlings. Glc and BR can promote LR emergence at lower concentrations, while at higher concentrations, both have an inhibitory effect. The BR biosynthesis and perception mutants showed highly reduced numbers of emerged LRs at all the Glc concentrations tested...
May 2015: Plant Physiology
Ji Wang, Dilip Shah, Xinyuan Chen, R Rox Anderson, Mei X Wu
There is an urgent need of adjuvants for cutaneous vaccination. Here, we report that micro-sterile inflammation induced at inoculation sites can augment immune responses to influenza vaccines in animal models. The inoculation site is briefly illuminated with a handheld, non-ablative fractional laser before the vaccine is intradermally administered, which creates an array of self-healing microthermal zones (MTZs) in the skin. The dying cells in the MTZs send 'danger' signals that attract a large number of antigen-presenting cells, in particular, plasmacytoid dendritic cells (pDCs) around each MTZ forming a micro-sterile inflammation array...
July 18, 2014: Nature Communications
Yiyan Zheng, Yurong Xie, Yuxiang Jiang, Xiaolu Qu, Shanjin Huang
Actin filaments are often arranged into higher-order structures, such as the longitudinal actin cables that generate the reverse fountain cytoplasmic streaming pattern present in pollen tubes. While several actin binding proteins have been implicated in the generation of these cables, the mechanisms that regulate their dynamic turnover remain largely unknown. Here, we show that Arabidopsis thaliana actin-depolymerizing factor7 (ADF7) is required for turnover of longitudinal actin cables. In vitro biochemical analyses revealed that ADF7 is a typical ADF that prefers ADP-G-actin over ATP-G-actin...
September 2013: Plant Cell
Jiaqiang Sun, Linlin Qi, Yanan Li, Qingzhe Zhai, Chuanyou Li
Both blue light (BL) and auxin are essential for phototropism in Arabidopsis thaliana. However, the mechanisms by which light is molecularly linked to auxin during phototropism remain elusive. Here, we report that phytochrome interacting factoR4 (PIF4) and PIF5 act downstream of the BL sensor phototropin1 (PHOT1) to negatively modulate phototropism in Arabidopsis. We also reveal that PIF4 and PIF5 negatively regulate auxin signaling. Furthermore, we demonstrate that PIF4 directly activates the expression of the auxin/indole-3-acetic acid (IAA) genes IAA19 and IAA29 by binding to the G-box (CACGTG) motifs in their promoters...
June 2013: Plant Cell
Robert P Kumpf, Chun-Lin Shi, Antoine Larrieu, Ida Myhrer Stø, Melinka A Butenko, Benjamin Péret, Even Sannes Riiser, Malcolm J Bennett, Reidunn B Aalen
Throughout their life cycle, plants produce new organs, such as leaves, flowers, and lateral roots. Organs that have served their purpose may be shed after breakdown of primary cell walls between adjacent cell files at the site of detachment. In Arabidopsis, floral organs abscise after pollination, and this cell separation event is controlled by the peptide INFLORESCENCE DEFICIENT IN ABSCISSION (IDA), which signals through the leucine-rich repeat receptor-like kinases HAESA (HAE) and HAESA-LIKE2 (HSL2). Emergence of new lateral root primordia, initiated deep inside the root under the influence of auxin, is similarly dependent on cell wall dissolution between cells in the overlaying endodermal, cortical, and epidermal tissues...
March 26, 2013: Proceedings of the National Academy of Sciences of the United States of America
Esther Carrera, Omar Ruiz-Rivero, Lazaro Eustaquio Pereira Peres, Alejandro Atares, Jose Luis Garcia-Martinez
procera (pro) is a tall tomato (Solanum lycopersicum) mutant carrying a point mutation in the GRAS region of the gene encoding SlDELLA, a repressor in the gibberellin (GA) signaling pathway. Consistent with the SlDELLA loss of function, pro plants display a GA-constitutive response phenotype, mimicking wild-type plants treated with GA₃. The ovaries from both nonemasculated and emasculated pro flowers had very strong parthenocarpic capacity, associated with enhanced growth of preanthesis ovaries due to more and larger cells...
November 2012: Plant Physiology
June-Sik Kim, Junya Mizoi, Satoshi Kidokoro, Kyonoshin Maruyama, Jun Nakajima, Kazuo Nakashima, Nobutaka Mitsuda, Yuko Takiguchi, Masaru Ohme-Takagi, Youichi Kondou, Takeshi Yoshizumi, Minami Matsui, Kazuo Shinozaki, Kazuko Yamaguchi-Shinozaki
Arabidopsis thaliana DEHYDRATION-RESPONSIVE ELEMENT BINDING PROTEIN2A (DREB2A) functions as a transcriptional activator that increases tolerance to osmotic and heat stresses; however, its expression also leads to growth retardation and reduced reproduction. To avoid these adverse effects, the expression of DREB2A is predicted to be tightly regulated. We identified a short promoter region of DREB2A that represses its expression under nonstress conditions. Yeast one-hybrid screening for interacting factors identified GROWTH-REGULATING FACTOR7 (GRF7)...
August 2012: Plant Cell
Koichi Kobayashi, Shinsuke Baba, Takeshi Obayashi, Mayuko Sato, Kiminori Toyooka, Mika Keränen, Eva-Mari Aro, Hidehiro Fukaki, Hiroyuki Ohta, Keiko Sugimoto, Tatsuru Masuda
Tight coordination between plastid differentiation and plant development is best evidenced by the synchronized development of photosynthetic tissues and the biogenesis of chloroplasts. Here, we show that Arabidopsis thaliana roots demonstrate accelerated chlorophyll accumulation and chloroplast development when they are detached from shoots. However, this phenomenon is repressed by auxin treatment. Mutant analyses suggest that auxin transported from the shoot represses root greening via the function of indole-3-acetic acid14, auxin response factor7 (ARF7), and ARF19...
March 2012: Plant Cell
Satoshi Kidokoro, Kyonoshin Maruyama, Kazuo Nakashima, Yoshiyuki Imura, Yoshihiro Narusaka, Zabta K Shinwari, Yuriko Osakabe, Yasunari Fujita, Junya Mizoi, Kazuo Shinozaki, Kazuko Yamaguchi-Shinozaki
Transcription factors of the DRE-Binding1 (DREB1)/C-repeat binding factor family specifically interact with a cis-acting dehydration-responsive element/C-repeat involved in low-temperature stress-responsive gene expression in Arabidopsis (Arabidopsis thaliana). Expression of DREB1s is induced by low temperatures and is regulated by the circadian clock under unstressed conditions. Promoter sequences of DREB1s contain six conserved motifs, boxes I to VI. We analyzed the promoter region of DREB1C using transgenic plants and found that box V with the G-box sequence negatively regulates DREB1C expression under circadian control...
December 2009: Plant Physiology
Han Woo Lee, Nan Young Kim, Dong Ju Lee, Jungmook Kim
The LATERAL ORGAN BOUNDARIES DOMAIN/ASYMMETRIC LEAVES2-LIKE (LBD/ASL) genes encode proteins harboring a conserved amino acid domain, referred to as the LOB (for lateral organ boundaries) domain. While recent studies have revealed developmental functions of some LBD genes in Arabidopsis (Arabidopsis thaliana) and in crop plants, the biological functions of many other LBD genes remain to be determined. In this study, we have demonstrated that the lbd18 mutant evidenced a reduced number of lateral roots and that lbd16 lbd18 double mutants exhibited a dramatic reduction in the number of lateral roots compared with lbd16 or lbd18...
November 2009: Plant Physiology
Shucai Wang, Shiv B Tiwari, Gretchen Hagen, Tom J Guilfoyle
AUXIN RESPONSE FACTOR7 (ARF7) is one of five ARF transcriptional activators in Arabidopsis thaliana that is proposed to regulate auxin-responsive expression of genes containing TGTCTC auxin response elements in their promoters. An Arabidopsis mutant (nonphototropic hypocotyl4-1 [nph4-1]) that is a null for ARF7 showed strongly reduced expression of integrated auxin-responsive reporter genes and natural genes that were monitored in Arabidopsis leaf mesophyll protoplasts. Expression of the reporter and natural genes was restored in an auxin-dependent manner when protoplasts were transfected with a 35S:ARF7 effector gene, encoding a full-length ARF7 protein...
July 2005: Plant Cell
Kiyoshi Tatematsu, Satoshi Kumagai, Hideki Muto, Atsuko Sato, Masaaki K Watahiki, Reneé M Harper, Emmanuel Liscum, Kotaro T Yamamoto
We have isolated a dominant, auxin-insensitive mutant of Arabidopsis thaliana, massugu2 (msg2), that displays neither hypocotyl gravitropism nor phototropism, fails to maintain an apical hook as an etiolated seedling, and is defective in lateral root formation. Yet other aspects of growth and development of msg2 plants are almost normal. These characteristics of msg2 are similar to those of another auxin-insensitive mutant, non-phototropic hypocotyl4 (nph4), which is a loss-of-function mutant of AUXIN RESPONSE FACTOR7 (ARF7) (Harper et al...
February 2004: Plant Cell
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