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Journal of Plant Physiology

Shihab Uddin, Shahnaj Parvin, Markus Löw, Glenn J Fitzgerald, Sabine Tausz-Posch, Roger Armstrong, Michael Tausz
The 'CO2 fertilisation effect' is often predicted to be greater under drier than wetter conditions, mainly due to hypothesised early season water savings under elevated [CO2 ] (e[CO2 ]). However, water savings largely depend on the balance between CO2 -induced improvement of leaf-level water use efficiency and CO2 -stimulation of transpiring leaf area. The dynamics of water use during the growing season can therefore vary depending on leaf area development. Two canola (Brassica napus L.) cultivars of contrasting growth and vigour (vigorous hybrid cv...
August 8, 2018: Journal of Plant Physiology
Przemysław Bernat, Justyna Nykiel-Szymańska, Ewa Gajewska, Sylwia Różalska, Paulina Stolarek, Julia Dackowa, Mirosława Słaba
2,4-dichlorophenoxyacetic acid (2,4-D) is among the most commonly used herbicides applied for weed control during wheat cultivation. However, its application could affect wheat growth. The present study investigates the effect of the ascomycetous fungus Trichoderma harzianum on lipid peroxidation, phospholipids, signaling lipids and phospholipase D in the seedlings of wheat (Triticum aestivum L.) treated with 2,4-D (2.5 mg L-1 ). In the group of 4-day-old seedlings exposed to the herbicide, increased lipid peroxidation and inhibition of growth were observed in shoots and roots...
August 1, 2018: Journal of Plant Physiology
Michał Nosek, Katarzyna Gawrońska, Piotr Rozpądek, Magdalena Szechyńska-Hebda, Andrzej Kornaś, Zbigniew Miszalski
In Mesembryanthemum crystallinum, crassulacean acid metabolism (CAM) is seemingly reversible, but unequivocal evidence for functional CAM withdrawal has yet to be shown. In this study, we confirmed the rapid downregulation of PEPC1 expression just 1 h after the removal of NaCl from the plant growth media. At the same time, the Δ malate values in desalted plants rapidly (1 d) re-established to values typical for C3 plants. This phenomenon allowed us to confirm functional CAM withdrawal in the desalted plants...
August 1, 2018: Journal of Plant Physiology
Changxia Li, Biting Bian, Tingyu Gong, Weibiao Liao
Previous results have shown that hydrogen peroxide (H2 O2 ) is involved in abscisic acid (ABA)-induced adventitious root development under drought stress. In this study, a comparative proteomic analysis was conducted to explore the key proteins during ABA-H2 O2 -induced adventitious rooting in cucumber (Cucumis sativus L.) under drought stress. The results revealed that 48 of 56 detected proteins spots were confidently matched to NCBI database entries. Among them, 10 protein spots were up-regulated while 4 protein spots were down-regulated under drought stress; 22 protein spots were up-regulated by ABA under drought stress; treatment with ABA plus H2 O2 scavenger catalase (CAT) up-regulated 6 protein spots and down-regulated 6 protein spots under drought stress...
August 1, 2018: Journal of Plant Physiology
Bing Zhang, Jianxiu Liu
TEOSINTE BRANCHED1 (TB1) encodes a TEOSINTE BRANCHED1, CYCLOIDEA, and PROLIFERATING CELL FACTOR (TCP) transcription factor that represses axillary bud outgrowth and lateral branch formation in plants. Previous studies have elucidated the essential tillering regulatory roles of TB1 in many grasses, including maize and rice; however, the functions of TB1 in turf grasses remain unclear. In this study, we cloned the CdTB1 gene from bermudagrass, an important turfgrass species, and characterized the transactivation function of the CdTB1 protein...
July 31, 2018: Journal of Plant Physiology
Mingxia Li, Jingshu Xu, Xiaoxia Wang, Hui Fu, Mingli Zhao, He Wang, Lianxuan Shi
Nitrogen is an essential macronutrient for plants and the common limiting factor for crop productivity worldwide. An effective approach to combat N deficiency and overuse is to understand the mechanism of low-nitrogen tolerance in plants and develop low-nitrogen-tolerant crop cultivars. Wild soybean has a high tolerance to poor environmental conditions, but, until now, no study has illustrated the mechanism of low-nitrogen tolerance at a metabolomic level. In this study, the photosynthetic characteristics and metabolomics of wild and cultivated soybean seedlings were analyzed, and the mechanism of wild soybean's low-nitrogen tolerance was explained using a sand culture experiment...
July 31, 2018: Journal of Plant Physiology
Guilherme Silva Martins, Natália Chagas Freitas, Wesley Pires Flausino Máximo, Luciano Vilela Paiva
The physiological and molecular responses to water stress are mediated by a range of mechanisms, many of which involve abscisic acid (ABA)-dependent signaling pathways. In addition, plants contain drought response genes that can be induced by ABA-independent routes, mediated by secondary messengers such as Ca2+ , or regulated by epigenetic modifications. The complex processes involved in the response to water stress can be investigated using molecular techniques to evaluate the expression patterns of genes of interest and to infer the behavior of different genotypes and species...
July 26, 2018: Journal of Plant Physiology
Gabriella Pocsfalvi, Lilla Turiák, Alfredo Ambrosone, Pasquale Del Gaudio, Gina Puska, Immacolata Fiume, Teresa Silvestre, Károly Vékey
Cell-derived vesicles are membrane-enclosed organelles that transport material inside and outside the cell. Plant-derived vesicles are receiving more and more attention due to their potential as nanovectors for the delivery of biologically active substances. Here, we studied the heterogeneity and protein biocargo in citrus fruit juice sac cell-derived vesicles populations. Micro- and nano-sized vesicle fractions were isolated from four citrus species, C. sinensis, C. limon, C. paradisi and C. aurantium, characterized using physicochemical methods and protein cargos were compared using label-free quantitative shotgun proteomics...
July 21, 2018: Journal of Plant Physiology
Li Wang, Libin Wang, Qian Chen, Guodong Chen, Shaoling Zhang, Juyou Wu, Sutian Tao
Mitochondrial calcium uniporter (MCU) plays an important role in cell senescence and aging in mammals. However, the function of MCU homologs during the ripening and senescence of postharvest fruit had not been characterized until recently. In this study, a comprehensive study was conducted on the characteristics of the MCU family genes in the pear genome. In total, seven PbrMCU genes were identified and classified into two subgroups. Whole-genome duplication (WGD)/segmental duplication is the main driving force behind their expansion...
July 20, 2018: Journal of Plant Physiology
Mingna Li, Kun Zhang, Yan Sun, Huiting Cui, Shihao Cao, Li Yan, Mengxin Xu
Salt stress is a major abiotic stress threatening plant growth and development throughout the world. In this study, we investigated the salt stress adaptation mechanism of Carex rigescens (Franch.) V. Krecz, a stress-tolerant turfgrass species with a wide distribution in northern China. Specifically, we analyzed the growth, physiology, and transcript expression patterns of two C. rigescens genotypes (Huanghua and Lvping No.1) exposed to salt stress. Results show that Huanghua demonstrated better growth performance, and higher turf quality (TQ), photochemical efficiency (Fv/Fm), relative water content (RWC), proline content, and lower relative electrolyte leakage (REL) during seven days of salt treatment compared to Lvping No...
July 19, 2018: Journal of Plant Physiology
Jinpeng Wan, Ping Zhang, Liangliang Sun, Shuang Li, Ruling Wang, Huakun Zhou, Wenying Wang, Jin Xu
The well-known neurotransmitter 5-hydroxytryptamine (serotonin) not only regulates sleep and mood in humans and animals but may also play important roles in modulating growth, development, and defense responses, such as seed germination, flowering, and abiotic stress tolerance, in plants. Serotonin inhibits primary root (PR) growth; however, the physiological and molecular mechanisms underlying serotonin-mediated PR growth inhibition remain largely unclear. Here, we investigate the effects of serotonin on root growth and development in Arabidopsis...
July 18, 2018: Journal of Plant Physiology
Zeyong Zhang, Huanhuan Liu, Ce Sun, Qibin Ma, Huaiyu Bu, Kang Chong, Yunyuan Xu
Improvement of salt tolerance is one of the major targets in rice breeding. Here, we report that the zinc-finger protein (ZFP) OsZFP213 functions in enhancing salt tolerance in rice. OsZFP213 is localized in the nucleus and has transactivation activity. Transgenic rice overexpressing OsZFP213 showed enhanced salt tolerance compared with wild type and OsZFP213 RNAi plants. Furthermore, OsZFP213 overexpression plants showed higher transcription levels of antioxidant system genes and higher catalytic activity of scavenging enzymes of reactive oxygen, such as superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT), and glutathione reductase (GR), and a lower level of ROS accumulation than that in wild type and OsZFP213 RNAi plants under salt treatment...
July 18, 2018: Journal of Plant Physiology
Joanna Ciura, Jerzy Kruk
In this review, we summarize the results of experiments that lead to altered levels of phytohormones in transgenic plants to improve plant productivity. The available data indicate that manipulating the level of phytohormones might also be a promising way to enhance the environmental stress tolerance of crop plants. In the regulation of the level of phytohormones, both biosynthesis and their catabolism pathways can be targeted for engineering purposes. Moreover, the signaling pathways of phytohormones should explored in this respect...
July 18, 2018: Journal of Plant Physiology
Chuan Yue, Hong-Li Cao, Dan Chen, Hong-Zheng Lin, Zan Wang, Juan Hu, Guo-Yi Yang, Yu-Qiong Guo, Nai-Xing Ye, Xin-Yuan Hao
Trichome (also referred to as 'háo' in tea) is a key feature in both tea products and tea plant (Camellia sinensis) selection breeding. Although trichomes are used as a model for studying cell differentiation and have been well studied in many plant species, the regulation of trichome formation at the molecular level is poorly understood in tea plants. In the present study, the hairy and hairless tea plant cultivars Fudingdabaicha (FDDB) and Rongchunzao (RCZ), respectively, were used to study this mechanism...
July 17, 2018: Journal of Plant Physiology
Yue Liu, Caixia Han, Xiong Deng, Dongmiao Liu, Nannan Liu, Yueming Yan
The aim of this study was to investigate the physiological and proteomic changes in the embryo and endosperm during seed germination in the elite Chinese bread wheat cultivar Zhengmai 366. Upon imbibition, seed size and water content increased rapidly, followed by a series of metabolic changes including increases in soluble sugar content and α-amylase activity, a decrease in starch content, and a rapid increase in plant hormones. In total, 57 and 45 differentially accumulated proteins (DAPs) from the embryo and endosperm, respectively, were identified at five germination stages (0, 6, 12, 18, and 24 h)...
July 11, 2018: Journal of Plant Physiology
Wenjie Yue, Xiaojun Nie, Licao Cui, Yongqiang Zhi, Ting Zhang, Xianghong Du, Weining Song
Autophagy, a highly conserved intracellular degradation system, is regarded to be responsible for self-defense and protect cells from abiotic stress. Extensive studies have demonstrated that autophagy plays a crucial role in regulating plant growth and development as well as in response to diverse stresses. However, little is known about autophagy-associated genes (ATGs) in wheat, especially those involved in the regulatory network of stress processes. In this study, a total of 108 putative wheat ATGs (TaATG) were obtained based on a genome-wide search approach...
July 11, 2018: Journal of Plant Physiology
Ralf Oelmüller
Roots respond to a cocktail of chemicals from microbes in the rhizosphere. Infochemicals in nmol concentrations activate receptor-mediated signal pathways, which reprogram the plant responses to environmental changes. The microbial signals have to pass the cell wall to activate pattern recognition receptors at the surface of the plant plasma membrane. The structure of the cell wall is not only a barrier for the signaling molecules, but also changes permanently during growth and development, as well as in response to microbial attacks or abiotic stress...
July 4, 2018: Journal of Plant Physiology
Marzena Sujkowska-Rybkowska, Ewa Znojek
Aluminum (Al) toxicity limits growth and symbiotic interactions of plants. Calcium plays essential roles in abiotic stresses and legume-Rhizobium symbiosis, but the sites and mechanism of Ca2+ mobilization during mycorrhizae have not been analyzed. In this study, the changes of cytoplasmic Ca2+ and calreticulin (CRT) in Medicago truncatula mycorrhizal (MR) and non-mycorrizal (NM) roots under short Al stress [50 μM AlCl3 pH 4.3 for 3 h] were analyzed. Free Ca2+ ions were detected cytochemically by their reaction with potassium pyroantimonate and anti-CRT antibody was used to locate this protein in Medicago roots by immunocytochemical methods...
July 3, 2018: Journal of Plant Physiology
Zhaniya Batyrshina, Timur M Yergaliyev, Zhadyrassyn Nurbekova, Nazira A Moldakimova, Zhaksylyk K Masalimov, Moshe Sagi, Rustem T Omarov
The influence of molybdenum, tungsten on germination and growth of barley Hordeum vulgare L. was studied. Results of this study revealed the differential effect of heavy metals on seedlings growth. Exogenous molybdenum treatment stimulated the growth of seedlings. The addition of the metal significantly stimulated root elongation. Contrastingly, the addition of tungsten resulted in increased seed germination and inhibits the growth of seedlings. The negative effect of tungsten on the growth of barley was more profound for roots of plants...
June 19, 2018: Journal of Plant Physiology
Liliana Lalaleo, Rubén Alcazar, Javier Palazon, Elisabeth Moyano, Rosa M Cusido, Mercedes Bonfill
Linum album is a herbaceous plant with medical interest due to its content of podophyllotoxin (PTOX), an aryltetralin lignan with cytotoxic activity. Previous studies in our laboratory showed that cell suspension cultures of L. album produced more PTOX than methoxypodophyllotoxin (6-MPTOX), both lignans being formed from the same precursor after divergence close to the end of the biosynthetic pathway. In contrast, the hairy roots produced more 6-MPTOX than PTOX. Taking into account this variability, we were interested to know if the lignan profile of an in vitro PTOX-producing L...
June 15, 2018: Journal of Plant Physiology
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