scholarly journals Arsenic Stress Responses and Accumulation in Rice

2021 ◽  
pp. 281-313
Author(s):  
Varunseelan Murugaiyan ◽  
Frederike Zeibig ◽  
Mahender Anumalla ◽  
Sameer Ali Siddiq ◽  
Michael Frei ◽  
...  
Keyword(s):  
Stress Responses ◽  
Anthropogenic Impacts ◽  
Arsenic Concentration ◽  
Arsenic Contamination ◽  
Rice Cultivars ◽  
Rice Varieties ◽  
Toxic Heavy Metal ◽  
Arsenic Accumulation ◽  
Speed Up ◽  
Livestock Health

AbstractRice (Oryza sativa L.) is one of the world’s most vital staple grains, and 90% of it is produced and consumed in Asia alone. It plays a significant role in the entry of mineral nutrients into the food chain. Arsenic (As) is a toxic heavy metal that threatens the major rice-growing regions in the world, particularly in Asia. Arsenic is ubiquitously present in moderate concentrations in the environment because of natural geological processes and anthropogenic impacts. However, rapid industrialization and excessive use of arsenic-rich groundwater are further fueling the increased arsenic concentration in agricultural topsoil. Arsenic accumulation in rice plants has a significant adverse effect on plant, human, and livestock health. Although arsenic contamination in rice is well documented, its interaction and accumulation in rice are poorly understood. So far, no candidate genes or QTLs associated with arsenic interaction are used in breeding programs for the development of low-arsenic-accumulating rice varieties. The development and adaptation of new low-arsenic-accumulating rice cultivars resilient to arsenic toxicity constitute safe ways to mitigate arsenic contamination in rice. Recent scientific advances in rice genetics, genomics, and physiology have opened up new opportunities to speed up the process of developing low-arsenic-accumulating rice cultivars for the rapidly growing human population.

scholarly journals Screening for Osmotic Stress Responses in Rice Varieties under Drought Condition

Rice Science ◽  
2017 ◽  
Vol 24 (5) ◽  
pp. 253-263 ◽  
Author(s):  
Simon Swapna ◽  
Korukkanvilakath Samban Shylaraj
Keyword(s):  
Osmotic Stress ◽  
Stress Responses ◽  
Drought Condition ◽  
Rice Varieties

Nitrogen supply influences arsenic accumulation and stress responses of rice (Oryza sativa L.) seedlings

2019 ◽  
Vol 367 ◽  
pp. 599-606 ◽  
Author(s):  
Sudhakar Srivastava ◽  
V.S. Pathare ◽  
Suvarna Sounderajan ◽  
P. Suprasanna
Keyword(s):  
Oryza Sativa ◽  
Stress Responses ◽  
Oryza Sativa L ◽  
Nitrogen Supply ◽  
Arsenic Accumulation

scholarly journals Brown spot disease severity, yield and yield loss relationships in pigmented upland rice cultivars from East Nusa Tenggara, Indonesia

2020 ◽  
Vol 21 (4) ◽  
Author(s):  
Yosep S. Mau ◽  
Antonius Ndiwa ◽  
Shirly Oematan
Keyword(s):  
Disease Severity ◽  
Yield Loss ◽  
Upland Rice ◽  
Brown Spot ◽  
Yield Reduction ◽  
Rice Cultivars ◽  
Rice Varieties ◽  
Resistance Level ◽  
Spot Disease ◽  
Brown Spot Disease

Abstract. Mau YS, Ndiwa ASS, Oematan SS. 2020. Brown spot disease severity, yield and yield loss relationships in pigmented upland rice cultivars from East Nusa Tenggara, Indonesia. Biodiversitas 21: 1625-1634. Brown spot is one of the most devastating diseases of rice, which could lead to total yield loss. The disease has a worldwide distribution, more specifically in areas where water supply is scarce, most specifically in the dry upland areas. Almost all stages of rice are affected by the disease, where leaves and grains are mostly affected. Considerable differences exist in susceptibility to brown spot among rice varieties, which may cause a large variation in yield loss caused by the disease. Therefore, the resistance level of rice varieties and their yield reduction has to be regularly evaluated and updated. There are only a few reports on the relationship between brown spot severity with yield and yield loss of upland rice, and is even lacking in pigmented upland rice. The objectives of the present study were to assess the brown spot severity and resistance level in pigmented upland rice cultivars from East Nusa Tenggara Province, Indonesia, and to elucidate their relationships with yield and yield reduction. Twenty four pigmented upland rice genotypes were evaluated in the field during May to October 2019, and their disease responses and yields were recorded. Disease severity was observed weekly and used to calculate Area Under the Disease Progress Curve (AUDPC) for comparison among the genotypes. The relationships between disease severity and AUDPC with yield and yield loss were also examined. The results showed significant variation in brown spot severity and AUDPC, ranging from, respectively, 11.11% to 40.70% and 398.42%-days to 1081.30%-days. Yields and yield losses of test genotypes also varied substantially. Yields under diseased-free and diseased plots ranged from, respectively, 2.34 t ha-1 to 6.13 t ha-1 and 1.68 t ha-1 to 3.74 t ha-1 while yield loss was between 10.46% and 56.15%. Six genotypes were moderately resistant, four genotypes were moderately susceptible and 14 genotypes were susceptible to brown spot. Neither disease severity nor AUDPC had a linear relationship with yield but both exhibited positive and linear relationships with yield loss.

scholarly journals Morphological Character of Local Irrigated Rice on Farmer Field in North Sulawesi

2018 ◽  
Vol 24 (1) ◽  
pp. 1
Author(s):  
Janne H.W. Rembang ◽  
Abdul W. Rauf ◽  
Joula O.M. Sondakh
Keyword(s):  
Qualitative Method ◽  
Morphological Character ◽  
Grain Morphology ◽  
Morphological Characters ◽  
Leaf Sheath ◽  
Rice Cultivars ◽  
Rice Varieties ◽  
Irrigated Rice ◽  
North Sulawesi ◽  
Leaf Character

<p>Local rice is a potential germplasm as a source of genes that control important properties in rice plants. The research aimed to characterize the morphological character of local rice cultivars of North Sulawesi. The research was conducted from January to June 2015 in North Sulawesi. The method used was the descriptive qualitative method. Exploration was done by collecting samples of local rice cultivars in North Sulawesi. Each cultivar was characterized its morphological characters according to the Characterization and Evaluation Guidelines of Rice Germplasm. The local rice found in North Sulawesi were 10 varieties, namely Pulo Sawah, Superwin, CK, Serwo, Pilihan, Sako, Sito Merah, Sito Putih, TB, and Serayu. There were similarities of the characters from all local rice varieties of North Sulawesi, such as culm (culm strength and culm habit), leaf character (basal leaf sheath color, leaf blade color, collar color, and auricle color), and flower character (panicle exsertion and panicle attitude of branches). The character of grain morphology was very diverse for all local rice varieties of North Sulawesi.</p>

scholarly journals Exploration of Intrinsic Microbial Community Modulators in the Rice Endosphere Indicates a Key Role of Distinct Bacterial Taxa Across Different Cultivars

2021 ◽  
Vol 12 ◽  
Author(s):  
Pei Wang ◽  
Xiao Kong ◽  
Hongsong Chen ◽  
Youlun Xiao ◽  
Huijun Liu ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Rice Cultivars ◽  
Rice Varieties ◽  
Microbial Network ◽  
Β Diversity ◽  
Group I ◽  
Α Diversity ◽  
Microbe Interactions ◽  
Endophytic Bacterial Community ◽  
Group Ii

Microbial communities associated with the plant phyllosphere and endosphere can have both beneficial as well as detrimental effects on their hosts. There is an ongoing debate to which extend the phyllosphere and endosphere microbiome assembly is controlled by the host plant how pronounced cultivar effects are. We investigated the bacterial and fungal communities from the phyllosphere and endosphere of 10 different rice cultivars grown under identical environmental conditions in the frame of a targeted approach to identify drivers of community assembly. The results indicated that the endophytic bacterial communities were clearly separated into two groups. The α-diversity and microbial network complexity within Group I were significantly lower than in Group II. Moreover, the genera Nocardioides, Microvirga, and Gaiella were significantly more abundant in Group II and only present in the interaction networks of this group. These three genera were significantly correlated with α- and β-diversity of the endophytic bacterial community and thus identified as major drivers of the endosphere community. We have identified keystone taxa that shape endophytic bacterial communities of different rice cultivars. Our overall findings provide new insights into plant-microbe interactions, and may contribute to targeted improvements of rice varieties in the future.

scholarly journals Removal of Arsenic Contamination from Gomti River Water by using Activated Charcoal Absorbent Integrated with Solar Distillation Unit

2020 ◽  
Vol 32 (3) ◽  
pp. 550-554 ◽  
Author(s):  
Suresh Kumar Patel ◽  
Dhananjay Singh ◽  
Rahul Dev
Keyword(s):  
River Water ◽  
Low Cost ◽  
Arsenic Concentration ◽  
Uttar Pradesh ◽  
Arsenic Contamination ◽  
Isotherm Models ◽  
Gomti River ◽  
Solar Distillation ◽  
Freundlich Adsorption Isotherm ◽  
Removal Of Arsenic

Arsenic is a ubiquitous and short-term poisoning element, which affects living things. In this study, the removal of arsenic from Gomti river water, Lucknow, Uttar Pradesh integrated modified double slope solar still with activated adsorption bed has been applied. Arsenic contamination in Gomti river at five places were found in the river water in the range of 55.70 ppb to 681.60 ppb, which exceed the maximum permissible limit of 10 ppb as recommended by WHO. Maximum concentration of arsenic in water was found in Mohan Maekins (681.60 ppb). However, mean arsenic concentration in water followed the order: Gaughat (115.37 ppb) < Hanuman setu (297.80 ppb) < Barrage (302.62 ppb) <Kukrail (336.27 ppb) < Mohan Maekins (481.89 ppb). The amount of adsorbed arsenic was increased with increasing initial concentration of arsenic. The aim of this study is to develop a low-cost process for the removal of arsenic effectively including the production of potable water. After results, data were analyzed with ICP-MS method and also verified with Langmuir and Freundlich adsorption isotherm models.

scholarly journals Role of unsaturated soil above a heavily contaminated aquifer in the natural attenuation of arsenic

2019 ◽  
Vol 98 ◽  
pp. 09017 ◽  
Author(s):  
Nadia Martínez-Villegas ◽  
Andrea del Pilar Gómez ◽  
Armando Zamora-Morales ◽  
Jejanny Lucero Hernández Martínez ◽  
Diana Meza-Figueroa ◽  
...  
Keyword(s):  
Natural Attenuation ◽  
Soil Profile ◽  
Particle Density ◽  
Capillary Rise ◽  
Arsenic Concentration ◽  
Shallow Aquifer ◽  
Horizontal Distance ◽  
Saturated Zone ◽  
Capillary Fringe ◽  
Arsenic Accumulation

Large attenuation of arsenic is observed in a shallow aquifer in central Mexico, where the concentration decreases from 91.5 to 11.3 mg/L, over 1.3 km horizontal distance. To investigate possible mechanisms of attenuation of this pollutant, we dug a pit between the surface and the saturated zone. We then described the soil profile and determined arsenic and iron concentrations in soil samples as a function of depth. Next, we determined particle size distribution, bulk density, particle density, soil moisture and porosity of the soil material. We also analyzed arsenic concentration in the groundwater. The 2.2 m deep profile intersected 4 soil horizons (A, AB, B1 and B2). We found arsenic accumulation in the B2 horizon, directly overlying the saturated zone. These accumulations coincide with the thickness of the capillary fringe, revealing that arsenic is drawn up in the soil profile by capillary rise of arsenic-contaminated groundwater. Furthermore, arsenic accumulation showed a direct relationship with iron, likely due to arsenic adsorption on iron oxides. Results from this study contribute to understanding a capillary-driven natural attenuation mechanism that removes contaminants from groundwater by sinking them in the capillary fringe.

Arsenate-Resistant Genes in Egyptian Rice Cultivars as Soil Pollution Sensors

2017 ◽  
Author(s):  
Elsayed E. Hafez ◽  
Ebtesam A. El. Bestawy ◽  
Mohamed A. Rashad ◽  
Sayed M. Hassan
Keyword(s):  
Soil Pollution ◽  
Messenger Rna ◽  
Basal Medium ◽  
Rice Cultivar ◽  
Rice Cultivars ◽  
Rice Varieties ◽  
Arbitrary Primers ◽  
Barr Virus ◽  
Rice Grains ◽  
Resistant Genes

The main objective of the present study was to investigate arsenate [As (V)] resistance genes in rice cultivars grown in arsenic contaminated Egyptian soil in order to genetically induce resistance against arsenic in the local rice varieties as well as defining contaminated rice grains and/or soil. Three local rice cultivars; Sakha 102-104 were cultivated on modified Murashige and Skoog Basal Medium (MS medium) containing elevated concentrations of arsenate (0.1, 1 and 10 mg/l). The three varieties showed different resistant attitudes against arsenate with Sakha 104 being the most resistant. Extracted messenger RNA (mRNA) from treated and untreated Sakha 104 plantlets was scanned using differential display to demonstrate the arsenate resistant genes using three different arbitrary primers. About 100 different RNAs with (1500 bp - 50 bp) were obtained from which seven were up-regulated genes, subjected to DNA cloning using TOPO TA system and the selected clones were sequenced. The sequence analysis described four genes out of the seven namely disease resistance protein RPM1, Epstein-Barr virus EBNA-1-like, CwfJ family protein and outer membrane lipoprotein OmlA while the other three genes were hypothetical proteins. It is concluded the four induced genes in the resistant rice cultivar considered as a direct response to arsenic soil pollution. Genes detected in the present study can be used as geno-sensors for rice grains and soil contamination with As (V). Moreover, local rice cultivars may be genetically modified with such genes to induce high resistance and to overcome arsenic soil pollution.

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