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Drought tolerance

Walid Ben-Romdhane, Rania Ben-Saad, Donaldo Meynard, Nabil Zouari, Ali Mahjoub, Lotfi Fki, Emmanuel Guiderdoni, Abdullah Al-Doss, Afif Hassairi
Herein, we report isolation of the AlTMP2 gene from the halophytic C4 grass Aeluropus littoralis. The subcellular localization suggested that AlTMP2 is a plasma membrane protein. In A. littoralis exposed to salt and osmotic stresses, the AlTMP2 gene was induced early and at a high rate, but was upregulated relatively later in response to abscisic acid and cold treatments. Expression of AlTMP2 in tobacco conferred improved tolerance against salinity, osmotic, H 2 O 2 , heat, and freezing stresses at the germination and seedling stages...
February 15, 2018: Protoplasma
Liyu Huang, Yinxiao Wang, Wensheng Wang, Xiuqin Zhao, Qiao Qin, Fan Sun, Fengyi Hu, Yan Zhao, Zichao Li, Binying Fu, Zhikang Li
HIGHLIGHTS Overexpressing and RNA interfering OsDRAP1 transgenic rice plants exhibited significantly improved and reduced drought tolerance, but accompanied with negative effects on development and yield. The dehydration responsive element binding (DREBs) genes are important transcription factors which play a crucial role in plant abiotic stress tolerances. In this study, we functionally characterized a DREB2-like gene, OsDRAP1 conferring drought tolerance (DT) in rice. OsDRAP1 , containing many cis -elements in its promoter region, was expressed in all organs (mainly expressed in vascular tissues) of rice, and induced by a variety of environmental stresses and plant hormones...
2018: Frontiers in Plant Science
Aansa Rukya Saleem, Cecilia Brunetti, Azeem Khalid, Gianni Della Rocca, Aida Raio, Giovanni Emiliani, Anna De Carlo, Tariq Mahmood, Mauro Centritto
Drought is one of the major constraints limiting agricultural production worldwide and is expected to increase in the future. Limited water availability causes significant effects to plant growth and physiology. Plants have evolved different traits to mitigate the stress imposed by drought. The presence of plant growth-promoting rhizobacteria (PGPR) could play an important role in improving plant performances and productivity under drought. These beneficial microorganisms colonize the rhizosphere of plants and increase drought tolerance by lowering ethylene formation...
2018: PloS One
Paul E Abraham, Benjamin J Garcia, Lee E Gunter, Sara S Jawdy, Nancy Engle, Xiaohan Yang, Daniel A Jacobson, Robert L Hettich, Gerald A Tuskan, Timothy J Tschaplinski
Drought stress is a recurring feature of world climate and the single most important factor influencing agricultural yield worldwide. Plants display highly variable, species-specific responses to drought and these responses are multifaceted, requiring physiological and morphological changes influenced by genetic and molecular mechanisms. Moreover, the reproducibility of water deficit studies is very cumbersome, which significantly impedes research on drought tolerance, because how a plant responds is highly influenced by the timing, duration, and intensity of the water deficit...
2018: PloS One
Donghua Li, Komivi Dossa, Yanxin Zhang, Xin Wei, Linhai Wang, Yujuan Zhang, Aili Liu, Rong Zhou, Xiurong Zhang
Sesame has great potential as an industrial crop but its production is challenged by drought and salt stresses. To unravel the genetic variants leading to salinity and drought tolerances at the germination stage, genome-wide association studies of stress tolerance indexes related to NaCl-salt and polyethylene glycol-drought induced stresses were performed with a diversity panel of 490 sesame accessions. An extensive variation was observed for drought and salt responses in the population and most of the accessions were moderately tolerant to both stresses...
February 14, 2018: Genes
Isabel Egea, Irene Albaladejo, Victoriano Meco, Belén Morales, Angel Sevilla, Maria C Bolarin, Francisco B Flores
Breeding for drought-tolerant crops is a pressing issue due to the increasing frequency and duration of droughts caused by climate change. Although important sources of variation for drought tolerance exist in wild relatives, the mechanisms and the key genes controlling tolerance in tomato are little known. The aim of this study is to determine the drought response of the tomato wild relative Solanum pennellii (Sp) compared with the cultivated tomato Solanum lycopersicum (Sl). The paper investigates the physiological and molecular responses in leaves of Sp and Sl plants without stress and moderate drought stress...
February 12, 2018: Scientific Reports
Somaye Hashempoor, Matin Ghaheri, Danial Kahrizi, Nastaran Kazemi, Saare Muhammadi, Seyed Mehdi Safavi, Tayebeh Ghorbani, Elham Rahmanian, Malihe Heshmatpanaah
Stevia rebaudiana Bertoni is one of the most important herbal sweetener plants from Asteracea family that have a lot of Steviol glycosides. Among different methods, tissue culture is the best way with high efficiency that is useful for studying stress tolerance mechanisms to obtain drought tolerance of stevia. For this purpose, different concentrations of mannitol (0, 10, 20, 30, 40, 50 mg/l) were used as various treatments in the culture medium of stevia. According to the results, the highest level of UGT85C2 gene expression (1...
February 10, 2018: Cellular and Molecular Biology
Matin Ghaheri, Elaheh Adibrad, Seyed Mehdi Safavi, Danial Kahrizi, Ali Soroush, Saare Muhammadi, Tayebeh Ghorbani, Ali Sabzevari, Zahra Ansarypour, Elham Rahmanian
Stevia rebaudiana Bertoni is One of the most important biologically sourced and low-calorie sweeteners that known as "Sweet Weed". It contains steviol glycosides that they are about 200-300 times sweeter than sucrose. Tissue culture is the best method with high efficiency that can overcome to problems of traditional methods, and it is the most useful tools for studying stress tolerance mechanisms under in vitro conditions to obtain drought tolerance. In the present research, we investigated the impact of life cycle, leaves location and the harvesting time on expression of UGT74G1 and UGT76G1 as well as steviol glycosides accumulation...
February 10, 2018: Cellular and Molecular Biology
Fernanda C C Marcos, Neidiquele M Silveira, João B Mokochinski, Alexandra C H F Sawaya, Paulo E R Marchiori, Eduardo C Machado, Gustavo M Souza, Marcos G A Landell, Rafael V Ribeiro
Under field conditions, plants are exposed to cycles of dehydration and rehydration during their lifespan. In this study, we hypothesized that sugarcane plants previously exposed to cycles of water deficits will perform better than plants that have never faced water deficits when both are subjected to low water availability. Sugarcane plants were grown in a nutrient solution and exposed to one (1WD), two (2WD) or three (3WD) water deficit cycles. As the reference, plants were grown in a nutrient solution without adding polyethylene glycol...
February 5, 2018: Journal of Plant Physiology
Yulan Shi, Xiule Yue, Lizhe An
Ω-3 fatty acid desaturases (FADs) are thought to contribute to plant stress tolerance mainly through the C18:3-induced membrane stabilization, but the comprehensive analysis of their roles in stress adaptation is lacking. Here, we isolated a microsomal ω-3 FAD gene (CbFAD3) from a cryophyte (Chorispora bungeana), and elucidated its functions in stress tolerance. CbFAD3, exhibiting highest identity to Arabidopsis AtFAD3, was up-regulated by abiotic stresses. Its functionality was verified by heterogonous expression in yeast...
February 8, 2018: Journal of Experimental Botany
Liping Huang, MengYao Zhang, Jing Jia, Xixi Zhao, Xingxiu Huang, E Ji, Lan Ni, Mingyi Jiang
OsLEA5 acts as a co-regulator of a transcriptional factor ZFP36 to enhance the expression and the activity of ascorbate peroxidase OsAPX1 to regulate seed germination in rice, but it it unknown whether OsLEA5 is also crucial in plant seedlings under stress conditions. To confirm it, we generated OsLEA5-overexpression and -knockdown rice plants. We found that overexpression of OsLEA5 in rice plants enhanced the tolerance to drought and salt stress; in contrast, an RNA interference (RNAi) mutant of OsLEA5 rice plants were more sensitive to drought and salinity...
February 7, 2018: Plant & Cell Physiology
Liming Yang, Jake C Fountain, Pingsheng Ji, Xinzhi Ni, Sixue Chen, Robert D Lee, Robert C Kemerait, Baozhu Guo
Drought stress conditions decrease maize growth and yield, and aggravate pre-harvest aflatoxin contamination. While several studies have been performed on mature kernels responding to drought stress, the metabolic profiles of developing kernels are not as well characterized, particularly in germplasm with contrasting resistance to both drought and mycotoxin contamination. Here, following screening for drought tolerance, a drought-sensitive line, B73, and a drought-tolerant line, Lo964, were selected and stressed beginning at 14 days after pollination...
February 12, 2018: Plant Biotechnology Journal
Ping Li, Yanxia Zhang, Xuexia Wu, Yujiao Liu
Water scarcity is a major abiotic stress factor that strongly influences growth, development and yield of grain legumes in arid and semi-arid area of the world. Drought stress frequently occurs during the seedling stage and finally affects yield of faba bean (Vicia faba L.). However, the responses of plant leaf to drought have not been documented very well at the proteomic level. "Ga da dou" of the drought-tolerant faba bean cultivar was exposed to drought to examine the proteome changes of leaves. In this study, 2-week-old seedlings were subjected to water deficit by 7 days drought stress, whereas control plants were regularly irrigated...
February 2018: 3 Biotech
Jian-Jun Tao, Wei Wei, Wen-Jia Pan, Long Lu, Qing-Tian Li, Jin-Biao Ma, Wan-Ke Zhang, Biao Ma, Shou-Yi Chen, Jin-Song Zhang
Alfin-like (AL) is a small plant-specific gene family with prominent roles in root growth and abiotic stress response. Here, we aimed to identify novel stress tolerance AL genes from the stress-tolerant species Atriplex hortensis. Totally, we isolated four AhAL genes, all encoding nuclear-localized proteins with cis-element-binding and transrepression activities. Constitutive expression of AhAL1 in Arabidopsis facilitated plants to survive under saline condition, while expressing anyone of the other three AhAL genes led to salt-hypersensitive response, indicating functional divergence of AhAL family...
February 9, 2018: Scientific Reports
Yongqing Wan, Mingzhu Mao, Dongli Wan, Qi Yang, Feiyun Yang, Mandlaa, Guojing Li, Ruigang Wang
BACKGROUND: WRKY transcription factors, one of the largest families of transcriptional regulators in plants, play important roles in plant development and various stress responses. The WRKYs of Caragana intermedia are still not well characterized, although many WRKYs have been identified in various plant species. RESULTS: We identified 53 CiWRKY genes from C. intermedia transcriptome data, 28 of which exhibited complete open reading frames (ORFs). These CiWRKYs were divided into three groups via phylogenetic analysis according to their WRKY domains and zinc finger motifs...
February 9, 2018: BMC Plant Biology
Shiju Wang, Kunyang Zhuang, Song Zhang, Minmin Yang, Fanying Kong, Qingwei Meng
Drought stress is a considerable environmental factor that restrains photosynthesis. Lutein, the most prolific carotenoid in plant photosynthetic tissues, plays vital roles in the light-harvesting complexes. However, its biological functions under abiotic stresses remain unclear. In our research, transgenic tobacco plants were utilized to investigate the function of the tomato chloroplast-targeted carotenoid epsilon-ring hydroxylase (SlLUT1) in drought stress tolerance. The analysis of SlLUT1-pro-LUC and qRT-PCR showed that drought stress induced SlLUT1 expression...
February 1, 2018: Journal of Plant Physiology
Goitseone Malambane, Satoko Nonaka, Hiroshi Shiba, Hiroshi Ezura, Hisashi Tsujimoto, Kinya Akashi
Ethylene (C2H4), a phytohormone that is produced in response to both abiotic and biotic stresses, is an important factor influencing the efficiency of Agrobacterium-mediated transformation. In this study, effects of various ethylene inhibitors on the efficiency of Agrobacterium-mediated genetic transformation in drought-tolerant wild watermelon was comparatively examined. Consequently, in comparison to the application of chemical inhibitors such as AgNO3 and aminoethoxyvinylglycine (AVG), lower ethylene level was observed when the infecting Agrobacterium contained a gene for 1-aminocyclopropane-carboxylic acid (ACC) deaminase (acdS), which cleaves ethylene precursor ACC into α-ketobutyrate and ammonia...
February 9, 2018: Bioscience, Biotechnology, and Biochemistry
Wilton Mbinda, Omwoyo Ombori, Christina Dixelius, Richard Oduor
Sweetpotato is a significant crop which is widely cultivated particularly in the developing countries with high and stable yield. However, drought stress is a major limiting factor that antagonistically influences the crop's productivity. Dehydration stress caused by drought causes aggregation of reactive oxygen species (ROS) in plants, and aldose reductases are first-line safeguards against ROS caused by oxidative stress. In the present study, we generated transgenic sweetpotato plants expressing aldose reductase, XvAld1 isolated from Xerophyta viscosa under the control of a stress-inducible promoter via Agrobacterium-mediated transformation...
February 9, 2018: Molecular Biotechnology
Dafeng Hui, Chih-Li Yu, Qi Deng, E Kudjo Dzantor, Suping Zhou, Sam Dennis, Roger Sauve, Terrance L Johnson, Philip A Fay, Weijun Shen, Yiqi Luo
Climate changes, including chronic changes in precipitation amounts, will influence plant physiology and growth. However, such precipitation effects on switchgrass, a major bioenergy crop, have not been well investigated. We conducted a two-year precipitation simulation experiment using large pots (95 L) in an environmentally controlled greenhouse in Nashville, TN. Five precipitation treatments (ambient precipitation, and -50%, -33%, +33%, and +50% of ambient) were applied in a randomized complete block design with lowland "Alamo" switchgrass plants one year after they were established from tillers...
2018: PloS One
Radha Yadav, Om Prakash Verma, Jasdeep Chatrath Padaria
Drought is one of the prime abiotic stresses responsible for limiting agricultural productivity. A number of drought responsive genes have been isolated and functionally characterized but these studies have been restricted to a few model plant systems. Very few drought responsive genes have been reported till date from non model drought tolerant plants. The present study aimed at identifying differentially expressed genes from a drought tolerant, non-model plant, Ziziphus nummularia (Burm.f.) Wight & Arn. One month old seedlings of Z...
February 7, 2018: Molecular Biology Reports
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