scholarly journals Nitric Oxide Induces Stomatal Closure and Enhances the Adaptive Plant Responses against Drought Stress

2001 ◽  
Vol 126 (3) ◽  
pp. 1196-1204 ◽  
Author(s):  
Carlos Garcı́a-Mata ◽  
Lorenzo Lamattina
Keyword(s):  
Nitric Oxide ◽  
Drought Stress ◽  
Stomatal Closure ◽  
Plant Responses

scholarly journals Morphological and Physiological Plant Responses to Drought Stress inThymus citriodorus

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Zdzislaw Attila Tátrai ◽  
Rabab Sanoubar ◽  
Zsuzsanna Pluhár ◽  
Silvia Mancarella ◽  
Francesco Orsini ◽  
...  
Keyword(s):  
Drought Stress ◽  
Plant Growth ◽  
Water Use ◽  
Water Uptake ◽  
Stomatal Closure ◽  
Water Shortage ◽  
Root Water Uptake ◽  
Absorption Capacity ◽  
Plant Responses ◽  
Mild Stress

Water availability is considered as a determinant factor that affects plant growth. The commercial medicinal values of an aromatic plant rely on the presence of secondary metabolites that are affected under water shortage. Two-year-oldThymus citriodorusplants were subjected to different polyethylene glycol (PEG-6000) levels (0, 2%, and 4%) under greenhouse condition. PEG treatment lasted for 15 days. Thyme plant showed a morphological drought avoidance mechanism by maintaining the root system development through shoot fresh weight reduction resulting in promoted root absorption capacity and sustained plant growth. Moreover, stressed plants were able to maintain water use efficiency and root : shoot ratio suggesting a strong relation between root water uptake and water use saving strategies. Furthermore, thyme plants reduced tissue dehydration through stomatal closure and improved root water uptake. Content of volatile oil constituents of geraniol and diisobutyl phthalate increased upon drought stress while pseudophytol was reduced. Unexpectedly, thymol was not reported as a main oil element under either control or mild stress condition, while it was increased upon high drought stress in measure of 4.4%. Finally, carvacrol significantly accumulated under high drought stress (+31.7%) as compared to control plants.

Pea Gβ subunit of G proteins has a role in nitric oxide-induced stomatal closure in response to heat and drought stress

PROTOPLASMA ◽  
2020 ◽  
Vol 257 (6) ◽  
pp. 1639-1654
Author(s):  
Deepak Bhardwaj ◽  
Ranjan Kumar Sahoo ◽  
Afsar Raza Naqvi ◽  
Suman Lakhanpaul ◽  
Narendra Tuteja
Keyword(s):  
Nitric Oxide ◽  
Drought Stress ◽  
G Proteins ◽  
Stomatal Closure

scholarly journals The SUPPRESSOR of MAX2 1 (SMAX1)-Like SMXL6, SMXL7 and SMXL8 Act as Negative Regulators in Response to Drought Stress in Arabidopsis

2020 ◽  
Vol 61 (8) ◽  
pp. 1477-1492 ◽  
Author(s):  
Tao Yang ◽  
Yuke Lian ◽  
Jihong Kang ◽  
Zhiyuan Bian ◽  
Lijuan Xuan ◽  
...  
Keyword(s):  
Drought Stress ◽  
Genetic Manipulation ◽  
Anthocyanin Biosynthesis ◽  
Stomatal Closure ◽  
Drought Response ◽  
Plant Responses ◽  
Sequencing Analysis ◽  
Dependent Manner ◽  
Cuticular Permeability ◽  
Biochemical Analyses

Abstract Drought represents a major threat to crop growth and yields. Strigolactones (SLs) contribute to regulating shoot branching by targeting the SUPPRESSOR OF MORE AXILLARY GROWTH2 (MAX2)-LIKE6 (SMXL6), SMXL7 and SMXL8 for degradation in a MAX2-dependent manner in Arabidopsis. Although SLs are implicated in plant drought response, the functions of the SMXL6, 7 and 8 in the SL-regulated plant response to drought stress have remained unclear. Here, we performed transcriptomic, physiological and biochemical analyses of smxl6, 7, 8 and max2 plants to understand the basis for SMXL6/7/8-regulated drought response. We found that three D53 (DWARF53)-Like SMXL members, SMXL6, 7 and 8, are involved in drought response as the smxl6smxl7smxl8 triple mutants showed markedly enhanced drought tolerance compared to wild type (WT). The smxl6smxl7smxl8 plants exhibited decreased leaf stomatal index, cuticular permeability and water loss, and increased anthocyanin biosynthesis during dehydration. Moreover, smxl6smxl7smxl8 were hypersensitive to ABA-induced stomatal closure and ABA responsiveness during and after germination. In addition, RNA-sequencing analysis of the leaves of the D53-like smxl mutants, SL-response max2 mutant and WT plants under normal and dehydration conditions revealed an SMXL6/7/8-mediated network controlling plant adaptation to drought stress via many stress- and/or ABA-responsive and SL-related genes. These data further provide evidence for crosstalk between ABA- and SL-dependent signaling pathways in regulating plant responses to drought. Our results demonstrate that SMXL6, 7 and 8 are vital components of SL signaling and are negatively involved in drought responses, suggesting that genetic manipulation of SMXL6/7/8-dependent SL signaling may provide novel ways to improve drought resistance.

scholarly journals Sulfate enhances drought tolerance in foxtail millet seedlings by promoting ABA biosynthesis and inducing stomatal closure

2021 ◽  
Author(s):  
Yansha Han ◽  
Dianqing Gong ◽  
Huilan Yi
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Stomatal Closure ◽  
Foxtail Millet ◽  
Natural Soil ◽  
Plant Responses ◽  
Crop Tolerance ◽  
Molecular Approaches ◽  
Sulfate Application ◽  
Aba Biosynthesis

Abstract Background and aims Sulfate, the main source of sulfur in natural soil, is critical for plant growth and development, as well as plant responses to environmental stress, including drought. However, our understanding of the detailed mechanisms of sulfate-modulated drought tolerance in crop plants is far from complete. In the present study, by using foxtail millet (Setaria italica L.), an emerging model crop, we investigated the possible mechanisms involved in sulfate-induced crop tolerance to drought stress. Methods A combination of biochemical and molecular approaches, as well as stomatal apertures analyses were applied to determine the effect of sulfate application on sulfur assimilation, ABA biosynthesis, and stomatal movement. Results Upon drought exposure, sulfate (4 mM) pretreatment significantly alleviated the decrease in relative water content in foxtail millet leaves. Exogenous sulfate increased endogenous sulfate content and markedly enhanced the enzyme activity of sulfite reductase (SiR) and O-acetylserine(thiol)lyase (OASTL), as well as levels of their transcripts, leading to an increase in cysteine (Cys) production in drought-stressed leaves. Furthermore, in comparison with drought stress alone, sulfate application significantly upregulated the transcriptional expression of SiABA3 and SiAAO3, which contributed to the increased ABA levels in the leaves of drought-stressed foxtail millet seedlings. Moreover, the addition of sulfate decreased stomatal aperture, thus resulting in reduced leaf water loss in foxtail millet exposed to drought. Conclusion Our data suggest that sulfate application was able to promote drought tolerance of foxtail millet plants, at least partially by increasing ABA biosynthesis and triggering stomatal closure.

Cytoplasmic Alkalization Mediates Exogenous Nitric Oxide-Induced Stomatal Closure in Vicia faba

2010 ◽  
Vol 36 (3) ◽  
pp. 533-538 ◽  
Author(s):  
Shi-Ling ZHAO ◽  
Li-Rong SUN ◽  
Huan ZHANG ◽  
Li-Ya MA ◽  
Bao-Shi LU ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Vicia Faba ◽  
Stomatal Closure ◽  
Exogenous Nitric Oxide

scholarly journals High-Throughput Phenotyping Methods for Breeding Drought-Tolerant Crops

2021 ◽  
Vol 22 (15) ◽  
pp. 8266
Author(s):  
Minsu Kim ◽  
Chaewon Lee ◽  
Subin Hong ◽  
Song Lim Kim ◽  
Jeong-Ho Baek ◽  
...  
Keyword(s):  
Drought Stress ◽  
High Throughput ◽  
Large Scale ◽  
Crop Yields ◽  
Plant Traits ◽  
Rapid Development ◽  
Plant Responses ◽  
Phenotypic Data ◽  
Agricultural Technologies ◽  
High Throughput Phenotyping

Drought is a main factor limiting crop yields. Modern agricultural technologies such as irrigation systems, ground mulching, and rainwater storage can prevent drought, but these are only temporary solutions. Understanding the physiological, biochemical, and molecular reactions of plants to drought stress is therefore urgent. The recent rapid development of genomics tools has led to an increasing interest in phenomics, i.e., the study of phenotypic plant traits. Among phenomic strategies, high-throughput phenotyping (HTP) is attracting increasing attention as a way to address the bottlenecks of genomic and phenomic studies. HTP provides researchers a non-destructive and non-invasive method yet accurate in analyzing large-scale phenotypic data. This review describes plant responses to drought stress and introduces HTP methods that can detect changes in plant phenotypes in response to drought.

Grain Development in Wheat under Combined Heat and Drought Stress: Plant Responses and Management

2021 ◽  
pp. 104517
Author(s):  
Noreen Zahra ◽  
Abdul Wahid ◽  
Muhammad Bilal Hafeez ◽  
Aman Ullah ◽  
Kadambot H.M. Siddique ◽  
...  
Keyword(s):  
Drought Stress ◽  
Plant Responses ◽  
Grain Development

scholarly journals Arabidopsis MADS-box factor AGL16 negatively regulates drought resistance via stomatal density and stomatal movement

2020 ◽  
Vol 71 (19) ◽  
pp. 6092-6106 ◽  
Author(s):  
Ping-Xia Zhao ◽  
Zi-Qing Miao ◽  
Jing Zhang ◽  
Si-Yan Chen ◽  
Qian-Qian Liu ◽  
...  
Keyword(s):  
Drought Stress ◽  
Drought Resistance ◽  
Molecular Mechanisms ◽  
Stomatal Density ◽  
Stomatal Closure ◽  
Negative Regulator ◽  
Stomatal Development ◽  
Mads Box ◽  
Mobility Shift ◽  
Aba Metabolism

Abstract Drought is one of the most important environmental factors limiting plant growth and productivity. The molecular mechanisms underlying plant drought resistance are complex and not yet fully understood. Here, we show that the Arabidopsis MADS-box transcription factor AGL16 acts as a negative regulator in drought resistance by regulating stomatal density and movement. Loss-of-AGL16 mutants were more resistant to drought stress and had higher relative water content, which was attributed to lower leaf stomatal density and more sensitive stomatal closure due to higher leaf ABA levels compared with the wild type. AGL16-overexpressing lines displayed the opposite phenotypes. AGL16 is preferentially expressed in guard cells and down-regulated in response to drought stress. The expression of CYP707A3 and AAO3 in ABA metabolism and SDD1 in stomatal development was altered in agl16 and overexpression lines, making them potential targets of AGL16. Using chromatin immunoprecipitation, transient transactivation, yeast one-hybrid, and electrophoretic mobility shift assays, we demonstrated that AGL16 was able to bind the CArG motifs in the promoters of the CYP707A3, AAO3, and SDD1 and regulate their transcription, leading to altered leaf stomatal density and ABA levels. Taking our findings together, AGL16 acts as a negative regulator of drought resistance by modulating leaf stomatal density and ABA accumulation.

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