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Physiologia Plantarum

Ping-Ping Hao, Guo-Ming Wang, Hai-Yan Cheng, Ya-Qi Ke, Kai-Jie Qi, Chao Gu, Shao-Ling Zhang
Ethylene response factor (ERF) has been widely studied in regulating fruit ripening in tomato, apple, banana and kiwifruit, but little is known in pear. In this study 1-methylcyclopropene (1-MCP) treatment, an inhibitor of ethylene perception, was conducted at approximately 30 days before harvest to delay fruit ripening in a climacteric white pear cultivar Yali. Transcriptome libraries were constructed and sequenced in pre-ripening, ripening, and 1-MCP treated fruits. Data analysis showed that 73 candidate genes related to fruit ripening were induced by 1-MCP, among which two were positively related, namely 1-aminocyclopropane-1-carboxyla oxidase and an ERF gene (designated as ACO54 and ERF24)...
November 16, 2017: Physiologia Plantarum
Lixiang Cheng, Yuping Wang, Yueshan Liu, Qingquan Zhang, Huihui Gao, Zhang Feng
Among the multiple environmental signals and hormonal factors regulating potato tuberization, gibberellins (GAs) are important components of the signaling pathways in these processes. To understand the GAs-signaling response mechanism of potato tuberization, a comparative proteomics approach was applied to analyze proteome change of potato tuberization in vitro subjected to a range of exogenous GA3 treatments (0, 0.01, 0.1 and 1.0 μΜ) using two-dimensional gel electrophoresis. Quantitative image analyses showed that a total of 37 protein spots have their abundance significantly altered more than 2-fold...
November 14, 2017: Physiologia Plantarum
Elias Kaiser, Shizue Matsubara, Jeremy Harbinson, Ep Heuvelink, Leo F M Marcelis
Plants in natural environments are often exposed to fluctuations in light intensity, and leaf-level acclimation to light may be affected by those fluctuations. Concurrently, leaves acclimated to a given light climate can become progressively shaded as new leaves emerge and grow above them. Acclimation to shade alters characteristics such as photosynthetic capacity. To investigate the interaction of fluctuating light and progressive shading, we exposed three-week old tomato (Solanum lycopersicum) plants to either lightflecks or constant light intensities...
November 10, 2017: Physiologia Plantarum
Mohammad Issawi, Damien Guillaumot, Vincent Sol, Catherine Riou
Antimicrobial Photodynamic Treatment based on the use of a photosensitizer to produce reactive oxygen species that induce cell death could be envisaged to fight against plant pathogens. For setting this strategy, we want to study how plants themselves respond to photodynamic treatment. In a previous work we showed that tomato plantlets were able to resist to photoactivated tetra (N-methylpyridyl) porphyrin (CP) or Zinc metalated form (CP-Zn). To enlarge our plant expertise related to exogenous porphyrins treatment and to further defend this approach, we studied how an adventice like Arabidopsis thaliana responded to exogenous supply of anionic and cationic porphyrins...
November 7, 2017: Physiologia Plantarum
Ahmed Ashoub, Niels Müller, José M Jiménez-Gómez, Wolfgang Brüggemann
Under field conditions, drought and heat stress typically happen simultaneously and their negative impact on the agricultural production is expected to increase worldwide under the climate change scenario. In this study, we performed RNA sequencing analysis on leaves of wild barley (Hordeum spontaneum) originated from the northern coastal region of Egypt following individual drought acclimation (DA) and heat shock (HS) treatments and their combination (CS) to distinguish the unique and shared differentially expressed genes...
November 7, 2017: Physiologia Plantarum
Konrad Weber, Meike Burow
Nitrogen, as limiting nutrient for plant growth and crop yield, is a main component of fertilizers and heavily used in modern agriculture. Early reports from over-application of fertilizers in crop production have shown to repress the transition from vegetative to reproductive phase. For the model plant Arabidopsis thaliana, there is evidence that low nitrogen conditions promote early flowering, while high nitrogen as well as nitrogen starvation conditions display the opposite effect. To gain a better understanding how nitrogen affects the onset of flowering, we reviewed the existing literature for A...
November 2, 2017: Physiologia Plantarum
Claudia A Bustamante, Yariv Brotman, Laura L Monti, Julieta Gabilondo, Claudio O Budde, María V Lara, Alisdair R Fernie, María F Drincovich
Peaches ripen and deteriorate rapidly at room temperature. Therefore, refrigeration is used to slow these processes and to extend fruit market life; however, many fruits develop chilling injury (CI) during storage at low temperature. Given that cell membranes are likely sites of the primary effects of chilling, the lipidome of six peach varieties with different susceptibility to CI was analyzed under different postharvest conditions. By using liquid chromatography coupled to mass spectrometry (LC-MS), 59 lipid species were detected, including diacyl and triacylglycerides...
November 2, 2017: Physiologia Plantarum
Dennis Eriksson, Henrik Brinch-Pedersen, Aakash Chawade, Inger Holme, Trine A K Hvoslef-Eide, Anneli Ritala, Teemu H Teeri, Tage Thorstensen
Plant research and breeding has a long and successful history in the Scandinavian countries Denmark, Finland, Norway and Sweden, and researchers in the region have been early in adopting plant gene technologies as they developed. This review gives a background, as well as discusses current and future progress of plant gene technology in these four countries. Country-specific details of the regulation of genetically modified plants are described, as well as similarities and differences in the approach to regulation of novel genome editing techniques...
October 28, 2017: Physiologia Plantarum
Qingxu Ma, Jun Wang, Yan Sun, Xin Yang, Jinzhao Ma, Tingqiang Li, Lianghuan Wu
The effects of elevated CO2 (eCO2 ) on the relative uptake of inorganic and organic nitrogen (N) are unclear. The uptake of different N sources by pakchoi (Brassica chinensis L.) seedlings supplied with a mixture of nitrate, glycine, and ammonium was studied using (15) N-labelling under ambient CO2 (aCO2 ) (350 ppm) or eCO2 (650 ppm) conditions. (15) N-labelled short-term uptake and (15) N-gas chromatography mass spectrometry (GC-MS) were applied to measure the effects of eCO2 on glycine uptake and metabolism...
October 28, 2017: Physiologia Plantarum
Maria Luz Annacondia, Melissa H Magerøy, German Martinez
Plants are sessile organisms that lack a specialized immune system to cope with biotic and abiotic stress. Instead, plants have complex regulatory networks that determine the appropriate distribution of resources between the developmental and the defence programs.
October 28, 2017: Physiologia Plantarum
Kirsten Krause, Hanne R Johnsen, Anna Pielach, Leidulf Lund, Karsten Fischer, Jocelyn K C Rose
The parasitic flowering plant genus Cuscuta (dodder) is a parasitic weed that infects many important crops. Once it winds around the shoots of potential host plants and initiates the development of penetration organs, called haustoria, only a few plant species have been shown to deploy effective defense mechanisms to ward off Cuscuta parasitization. However, a notable exception is Solanum lycopersicum (tomato), which exhibits a local hypersensitive reaction when attacked by giant dodder (C. reflexa). Interestingly, the closely related wild desert tomato, S...
October 28, 2017: Physiologia Plantarum
Anna De Luca, José M Pardo, Eduardo O Leidi
Cation antiporters of the NHX family are widely regarded as determinants of salt tolerance due to their capacity to drive sodium (Na) and sequester it into vacuoles. Recent work shows however that NHX transporters are primarily involved in vacuolar potassium (K) storage. Over-expression of the K/H antiporter AtNHX1 in tomato increases K accumulation into vacuoles and plant sensitivity to K deprivation. Here we show that the appearance of early leaf symptoms of K deficiency was associated with higher concentration of polyamines...
October 27, 2017: Physiologia Plantarum
Yanfei Liu, Bin Zhou, Yingwei Qi, Cuihua Liu, Zhande Liu, Xiaolin Ren
Much of the diversity of anthocyanin pigmentation in plant tissues is due to the action of glycosyltransferases, which attach sugar moieties to the anthocyanin aglycone. This step can increase both their solubility and stability. We investigated the pigmentation of the outer and inner pericarps of developing fruit of the red-fleshed kiwifruit Actinidia chinensis cv. 'Hongyang'. The results show that the red color of the inner pericarp is due to anthocyanin. Based on expression analyses of structural genes, AcUFGT was shown to be the key gene involved in the anthocyanin biosynthetic pathway...
October 23, 2017: Physiologia Plantarum
Hafiz B Ahmad, Frederic Lens, Gaelle Capdeville, Régis Burlett, Laurent J Lamarque, Sylvain Delzon
Drought-induced xylem embolism is a key process closely related to plant mortality during extreme drought events. However, this process has been little investigated in crop species to date, despite the observed decline of crop productivity under extreme drought conditions. Interspecific variation in hydraulic traits has frequently been reported, but less is known about intraspecific variation in crops. We assessed the intraspecific variability of embolism resistance in four sunflower (Helianthus annuus L) accessions grown in well-watered conditions...
October 23, 2017: Physiologia Plantarum
Xiaoxiao Wang, Wencheng Wang, Jianliang Huang, Shaobing Peng, Dongliang Xiong
Salinity significantly limits leaf photosynthesis but the photosynthetic limiting factors in salt- stressed leaves remain unclear. In the present work, photosynthetic and biochemical traits were investigated in four rice genotypes under two NaCl (0 and 150 mM) concentration to assess the stomatal, mesophyll and biochemical contributions to reduced photosynthetic rate (A) in salt stressed leaves. Our results indicated that salinity led to a decrease in A, leaf osmotic potential, electron transport rate and CO2 concentrations in the chloroplasts (Cc ) of rice leaves...
October 21, 2017: Physiologia Plantarum
Reyes Rodenas, Manuel Nieves-Cordones, Rosa María Rivero, Vicente Martinez, Francisco Rubio
Potassium (K(+) ) and Cesium (Cs(+) ) are chemically similar but while K(+) is an essential nutrient, Cs(+) can be toxic for living organisms, plants included. Two different situations could lead to problems derived from the presence of Cs(+) in agricultural systems: (1) presence of Cs(+) at high concentrations that could produce toxic effects on plants and (2) presence of micromolar concentrations of radiocesium, which can be accumulated in the plant and affect animal and human health through the food chain...
October 21, 2017: Physiologia Plantarum
Abid Ullah, Heng Sun, Hakim, Xiyan Yang, Xianlong Zhang
WRKY transcription factors are transcriptional regulators of signalling pathways involved in biotic and abiotic stress responses. In this study, we report that ectopic expression of the GhWRKY6-like gene significantly improved salt tolerance in Arabidopsis while silencing the GhWRKY6-like increase the sensitivity to abiotic stresses in cotton. GhWRKY6-like was localized to the nucleus. Expression of GhWRKY6-like was remarkably induced by salt, ethylene glycol (PEG) and abscisic acid (ABA) treatments. For further characterization, the GhWRKY6-like gene was cloned and transformed into Arabidopsis...
October 13, 2017: Physiologia Plantarum
Genaina Aparecida de Souza, Denise Cunha Fernandes Dos Santos Dias, Thaline Martins Pimenta, Andrea Lanna Almeida, Edgard Augusto de Toledo Picoli, Antônio de Pádua Alvarenga, José Cleydson Ferreira da Silva
Changes in the concentration of sugars and sucrose metabolism enzymes can characterize the developmental stages of a seed. In recalcitrant species such as Hevea brasiliensis L., little is known about these changes. We aimed to evaluate the three main stages of development of rubber tree seeds - histodifferentiation, cell elongation and accumulation of reserves. The activities of acid and neutral invertases (E.C. and sucrose synthase (EC, and the concentrations of reducing sugars (RS), total soluble sugars (TSS), and sucrose (Suc) were determined concomitantly with the histochemical and anatomical evaluation of seed structure...
October 9, 2017: Physiologia Plantarum
Jesús Rodríguez-Calcerrada, Ana Margarida Rodrigues, Pedro Perdiguero, Carla António, Owen K Atkin, Meng Li, Carmen Collada, Luis Gil
Drought-induced reduction of leaf gas exchange entails a complex regulation of the plant leaf metabolism. We used a combined molecular and physiological approach to understand leaf photosynthetic and respiratory responses of two-year-old Quercus ilex seedlings to drought. Mild drought stress resulted in glucose accumulation while net photosynthetic CO2 uptake (Pn ) remained unchanged, suggesting a role of glucose in stress signaling and/or osmoregulation. Simple sugars and sugar alcohols increased throughout moderate to very severe drought stress conditions, in parallel to a progressive decline in Pn and the quantum efficiency of photosystem II; by contrast, minor changes occurred in respiration rates until drought stress was very severe...
October 6, 2017: Physiologia Plantarum
Ryuuichi D Itoh, Hiroki Ishikawa, Kohdai P Nakajima, Shota Moriyama, Makoto T Fujiwara
Stromules, or stroma-filled tubules, are thin extensions of the plastid envelope membrane that are most frequently observed in undifferentiated or non-mesophyll cells. The formation of stromules is developmentally regulated and responsive to biotic and abiotic stress; however, the physiological roles and molecular mechanisms of the stromule formation remain enigmatic. Accordingly, we attempted to obtain Arabidopsis thaliana mutants with aberrant stromule biogenesis in the leaf epidermis. Here, we characterize one of the obtained mutants...
October 6, 2017: Physiologia Plantarum
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