scholarly journals The role of silicon in metabolic acclimation of rice plants challenged with arsenic

2016 ◽  
Vol 123 ◽  
pp. 22-36 ◽  
Author(s):  
Lílian M.V.P. Sanglard ◽  
Kelly C. Detmann ◽  
Samuel C.V. Martins ◽  
Rodrigo A. Teixeira ◽  
Lucas F. Pereira ◽  
...  
Keyword(s):  
Rice Plants

Role of peroxidases in the compensation of cytosolic ascorbate peroxidase knockdown in rice plants under abiotic stress

2011 ◽  
Vol 34 (10) ◽  
pp. 1705-1722 ◽  
Author(s):  
AURENIVIA BONIFACIO ◽  
MARCIO O. MARTINS ◽  
CAROLINA W. RIBEIRO ◽  
ADILTON V. FONTENELE ◽  
FABRICIO E. L. CARVALHO ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Ascorbate Peroxidase ◽  
Rice Plants ◽  
Cytosolic Ascorbate Peroxidase

scholarly journals Comparative study on the influence of silicon and selenium to mitigate arsenic induced stress by modulating TCA cycle, GABA and polyamine synthesis in rice seedlings

2021 ◽  
Author(s):  
Susmita Das ◽  
Barsha Majumder ◽  
Asok Kumar Biswas
Keyword(s):  
Tca Cycle ◽  
Future Application ◽  
Rice Seedlings ◽  
Respiratory Enzymes ◽  
Rice Plants ◽  
Regulatory Enzymes ◽  
Joint Application ◽  
Defensive Role ◽  
Gaba Accumulation

Abstract Arsenic contamination of groundwater is a major concern for its use as drinking water and crop irrigation in many regions of the world. Arsenic is absorbed by rice plants from arsenic contaminated water during irrigation, hampers growth and agricultural productivity. The aim of the study was to mitigate the activity of TCA cycle, synthesis of γ-aminobutyric acid (GABA) and polyamines (PAs) in rice (Oryza sativa L. cv. MTU-1010) seedlings under arsenate (As-V) stress [25 µM, 50 µM and 75 µM] by silicon (Si) [2 mM] and selenium (Se) [5 µM] amendments, and to investigate which chemical was more potential to combat this threat. As(V) application decreased the activities of tested respiratory enzymes while the levels of organic acids (OAs) were increased in the test seedlings. Co-application of Si and As(V) increased the activities of respiratory enzymes, consequently further increased accumulation of OAs that were more than Se with As(V) application in the test seedlings. GABA accumulation along with the activities of its regulatory enzymes were enhanced under As(V) stress. During joint application of Si and As(V) and Se and As(V) said parameters were decreased showing defensive role of these chemicals to resist As(V) toxicity in rice but amendment of Si was more potential than Se amendment resulted reduction of stress induced damage in the test seedlings. PAs trigger tolerance mechanism against stress in plants. PAs viz., Putrescine, spermidine and spermine were synthesized more during Si and Se amendments in As(V) contaminated rice seedlings to combat the effect of stress. Si amendment substantially modulated the toxic effects caused by As(V) over Se amendment in As(V) challenged test seedlings. Thus in future application Si enriched fertilizer will be beneficial than application of Se enriched fertilizer to grow rice plants with normal vigor in arsenic contaminated soil.

Role of Silicon and Salicylic Acid in the Mitigation of Nitrogen Deficiency Stress in Rice Plants

Silicon ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 997-1005 ◽  
Author(s):  
Angélica Cristina Fernandes Deus ◽  
Renato de Mello Prado ◽  
Rita de Cássia Félix Alvarez ◽  
Raimundo Leonardo Lima de Oliveira ◽  
Guilherme Felisberto
Keyword(s):  
Salicylic Acid ◽  
Nitrogen Deficiency ◽  
Rice Plants

scholarly journals Nitrous Oxide Emissions from Paddies: Understanding the Role of Rice Plants

Plants ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 180
Author(s):  
Arbindra Timilsina ◽  
Fiston Bizimana ◽  
Bikram Pandey ◽  
Ram Kailash Prasad Yadav ◽  
Wenxu Dong ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Rice Plant ◽  
Soil Microorganisms ◽  
N2o Emission ◽  
Nitrous Oxide Emissions ◽  
Agricultural Activity ◽  
N2o Formation ◽  
Rice Plants ◽  
Potential Source

Paddies are a potential source of anthropogenic nitrous oxide (N2O) emission. In paddies, both the soil and the rice plants emit N2O into the atmosphere. The rice plant in the paddy is considered to act as a channel between the soil and the atmosphere for N2O emission. However, recent studies suggest that plants can also produce N2O, while the mechanism of N2O formation in plants is unknown. Consequently, the rice plant is only regarded as a channel for N2O produced by soil microorganisms. The emission of N2O by aseptically grown plants and the distinct dual isotopocule fingerprint of plant-emitted N2O, as reported by various studies, support the production of N2O in plants. Herein, we propose a potential pathway of N2O formation in the rice plant. In rice plants, N2O might be formed in the mitochondria via the nitrate–nitrite–nitric oxide (NO3–NO2–NO) pathway when the cells experience hypoxic or anoxic stress. The pathway is catalyzed by various enzymes, which have been described. So, N2O emitted from paddies might have two origins, namely soil microorganisms and rice plants. So, regarding rice plants only as a medium to transport the microorganism-produced N2O might be misleading in understanding the role of rice plants in the paddy. As rice cultivation is a major agricultural activity worldwide, not understanding the pathway of N2O formation in rice plants would create more uncertainties in the N2O budget.

scholarly journals Enhanced accumulation of gibberellins rendered rice seedlings sensitive to ammonium toxicity

2019 ◽  
Vol 71 (4) ◽  
pp. 1514-1526
Author(s):  
Baolan Wang ◽  
Haifang Wei ◽  
Hui Zhang ◽  
Wen-Hao Zhang
Keyword(s):  
Physiological Function ◽  
Wild Type ◽  
Rice Seedlings ◽  
Gene Encoding ◽  
Ammonium Toxicity ◽  
Rice Plants ◽  
Worldwide Phenomenon ◽  
Increased Sensitivity ◽  
Ga Biosynthesis

Abstract Ammonium (NH4+) phytotoxicity is a worldwide phenomenon, but the primary toxic mechanisms are still controversial. In the present study, we investigated the physiological function of gibberellins (GAs) in the response of rice plants to NH4+ toxicity and polyamine accumulation using GA biosynthesis-related rice mutants. Exposure to NH4+ significantly decreased GA4 production in shoots of wild-type (WT) plants. Both exogenous GA application to the WT and increases in endogenous GA levels in eui1 mutants rendered them more sensitive to NH4+ toxicity. In contrast, growth of sd1 GA-deficient mutants was more tolerant to NH4+ toxicity than that of their WT counterparts. The role of polyamines in GA-mediated NH4+ toxicity was evaluated using WT rice plants and their GA-related mutants. The eui1 mutants with GA overproduction displayed a higher endogenous putrescine (Put) accumulation than WT plants, leading to an enhanced Put/[spermidine (Spd)+spermine (Spm)] ratio in their shoots. In contrast, mutation of the SD1 gene encoding a defective enzyme in GA biosynthesis resulted in a significant increase in Spd and Spm production, and reduction in the Put/(Spd+Spm) ratio when exposed to a high NH4+ medium. Exogenous application of Put exacerbated symptoms associated with NH4+ toxicity in rice shoots, while the symptoms were alleviated by an inhibitor of Put biosynthesis. These findings highlight the involvement of GAs in NH4+ toxicity, and that GA-induced Put accumulation is responsible for the increased sensitivity to NH4+ toxicity in rice plants.

scholarly journals Role of the Leaf Sheath in Elongation of the Internodes of Rice Plants.

1992 ◽  
Vol 61 (2) ◽  
pp. 235-243
Author(s):  
Kiyoshi TAKAHASHI
Keyword(s):  
Leaf Sheath ◽  
Rice Plants

The role of rice plants in regulating mechanisms of methane missions

2000 ◽  
Vol 31 (1) ◽  
pp. 20-29 ◽  
Author(s):  
R. Wassmann ◽  
M. S. Aulakh
Keyword(s):  
Rice Plants
Sign in / Sign up

Export Citation Format

Share Document