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At least 19 recordsLinked to original sources

PubMed2026

Translating Flood-Tolerance Biology into Breeding: A 5D Framework for Next-Generation Rice Varieties.

Flooding is among the most devastating abiotic stresses limiting rice productivity. Although SUB1A introgression conferred submergence tolerance in several mega-varieties, this single-gene approach is insufficient for the diverse flood types-flash floods, stagnant floods, anaerobic germination, and deepwater inundation-progressively intensifying with climate change. Here, we review the physiological mechanisms and genetic architecture underlying tolerance to each flood type, emphasizing the dual role of reactive oxygen species (ROS) in signalling and damage, the management of elemental toxicities (Fe2+, Mn2+) under altered soil redox, and lessons from wetland species and lowland rice. We then examine why marker-assisted selection has failed for polygenic, multi-stress tolerance and identify persistent breeding bottlenecks. Building on this biological foundation, we outline an integrated 5D framework (Demand, Discovery, Design, Development, Deployment) that links gene-bank diversity, multi-omics discovery, predictive breeding and on-farm validation through continuous feedback. We discuss how connected breeding, the transition-from-trait-to-environment (TTE) strategy, and speed breeding can accelerate genetic gain, and we close with research priorities centred on the biology of multi-flood tolerance to develop climate-resilient rice.

5D breeding framework↗

PubMed2026

Watershed-scale risk assessment of cadmium contamination in Chinese cropland soils: Dual pathways of irrigation input and flood-driven transport.

Irrigation and flood events serve as critical pathways for the transport of cadmium (Cd) from industrial sources into cropland soils at the watershed scale, constituting a major driver of widespread Cd contamination in China's cropland soil. This study evaluated the risk of Cd contamination in cropland soils across China's nine major river basins at the watershed scale, focusing on the contributions of irrigation and flood events, and conducted a sensitivity analysis of key risk factors. The assessment was conducted within a framework that considered factors including hazard, exposure, and vulnerability. The results revealed that numerous watersheds in southeastern China are exposed to dual pressures of Cd contamination risks in cropland soils, driven by both irrigation practices and flood events. Watersheds categorized as High-High, High-Moderate, or Moderate-High risk, reflecting combined Cd contamination risks from irrigation and flood, are vital to China's grain production, contributing 67.1 % of the national cropland area and 66.4 % of the grain yield. The study suggests localized strategies for managing cropland soils Cd contamination risks from irrigation and flood at the watershed scale in China, alongside strengthened cross-regional collaboration in southeastern China.

Cadmium↗

PubMed1977

Persistence of poliovirus 1 in soil and on vegetables grown in soil previously flooded with inoculated sewage sludge or effluent.

Land disposal of sewage sludge and effluent is becoming a common practice in the United States. The fertilizer content and humus value of such wastes are useful for agricultural purposes, and the recycling of sewage onto the land eliminates many of our stream pollution problems. The potential exists for crops grown in such irrigated soil to be contaminated by viruses that may be present in the sewage. Studies were initiated to determine viral persistence in soil and on crops grown under natural conditions in field plots that had been flooded to a depth of 1 inch (2.54 cm) with poliovirus 1-inoculated sewage wastes. Lettuce and radishes were planted in sludge- or effluent-flooded soil. In one study, the vegetables were planted 1 day before flooding, and in another they were planted 3 days after the plots were flooded. Survival of poliovirus 1 in soil irrigated with inoculated sewage sludge and effluent was determined during two summer growing seasons and one winter period. The longest period of survival was during the winter, when virus was detected after 96 days. During the summer, the longest survival period was 11 days. Poliovirus 1 was recovered from the mature vegetables 23 days after flooding of the plots had ceased. Lettuce and radishes are usually harvested 3 to 4 weeks after planting.

Poliovirus↗

PubMedDate not supplied

Physiological mechanisms of flooding (implosion) therapy.

Desensitization of psychological and physiological complex structures may be the most important element of flooding treatment. The implosive sessions are assumed to represent a supramaximal stimulation of pathologically excited and inert complex structures resulting in protective inhibition, irradiation of excitation, reduction of the excitation and inertness, and a decrease of the overshooting autonomic reactivity of the complex structures, leading to reduction of anxiety, aggression, and other pathologically increased feelings. Advantages such as stronger and improved flooding can be achieved by a flooding in hypnosis. The therapeutic indications go beyond the usual treatment of phobic states. In order to establish the psychological and physiological mechanisms in implosion there is a need for psychophysiological investigations. However, much is unknown about mechanisms. Controlled comparisons with other treatments give limited answers. Perhaps an international case history bank might establish which clinical conditions might benefit by technical modifications of flooding.

Animals↗

PubMed1976

Volatilization of lindance from water in soil-free and flooded soil systems.

Volatilization of 14C-lindane from water in planchets and under flooded soil ecosystem was investigated. Lindane disappeared faster than parathion from planchets. More rapid loss of both insecticides occurred from water than from chloroform. Loss of lindane and parathion was related to measured losses of water by evaporation. During 5-day incubation under flooded soil conditions, disappearance of lindane was faster from open vials than from sealed vials, whereas in nonflooded soil, no volatile loss of the insecticide was evident despite water evaporation. Over 5 day incubation under flooded conditions, greater volatile loss of lindane occurred in sandy soil than in alluvial soil apparanetly due to greater adsorption to the soil colloids decreasing the insecticide concentration in the standing water on the laterite soil. Under identical conditions of water evaporation, lindane loss was directly proportional to its initial concentration in the water. These results suggest that considerable loss of soil applied pesticides can occur by volatilization from the standing water in flooded rice fields, particularly under tropical conditions.

Hexachlorocyclohexane↗

PubMed1979

Effect of ferrous sulfate on parathion degradation in flooded soil.

In an isotope study, the effect of ferrous sulfate on the degradation of parathion was studied under flooded soil conditions. The addition of ferrous sulfate to flooded soil led to more rapid and extensive degradation of parathion with the formation of additional degradation products in ferrous sulfate-amended soil. This effect was not pronounced when ferrous sulfate was added to non-flooded soil or to flooded autoclaved soil. Sulfate, rather than Fe2+, was implicated in the extensive degradation of parathion.

Autoradiography↗

PubMed1976

Virus movement in soil columns flooded with secondary sewage effluent.

Secondary sewage effluent containing about 3 X 10(4) plaque-forming units of polio virus type 1 (LSc) per ml was passed through columns 250 cm in length packed with calcareous sand from an area in the Salt River bed used for ground-water recharge of secondary sewage effluent. Viruses were not detected in 1-ml samples extracted from the columns below the 160-cm level. However, viruses were detected in 5 of 43 100-ml samples of the column drainage water. Most of the viruses were adsorbed in the top 5 cm of soil. Virus removal was not affected by the infiltration rate, which varied between 15 and 55 cm/day. Flooding a column continuosly for 27 days with the sewage water virus mixture did not saturate the top few centimeters of soil with viruses and did not seem to affect virus movement. Flooding with deionized water caused virus desorption from the soil and increased their movement through the columns. Adding CaCl2 to the deionized water prevented most of the virus desorption. Adding a pulse of deionized water followed by sewage water started a virus front moving through the columns, but the viruses were readsorbed and none was detected in outflow samples. Drying the soil for 1 day between applying the virus and flooding with deionized water greatly reduced desorption, and drying for 5 days prevented desorption. Large reductions (99.99% or more) of virus would be expected after passage of secondary sewage effluent through 250 cm of the calcareous sand similar to that used in our laboratory columns unless heavy rains fell within 1 day after the application of sewage stopped. Such virus movement could be minimized by the proper management of flooding and drying cycles.

Adsorption↗

PubMed1978

Some age-related effects of the 1974 Brisbane floods.

Some age-related effects of the 1974 Brisbane floods are examined. The impact of the floods on health increased in those over 35 years of age probably because they were more likely to be householders. Women under 65 years of age had more psychiatric symptoms than men, but this sex difference disappeared in those over 65 years, perhaps because the working man is not constantly confronted with the damage to his home in the way that others are. The possibility that people over 75 years living in flood-affected suburbs experienced increased morbidity even though not themselves flooded cannot be excluded.

Adolescent↗

PubMed1979

Mood changes and flooding outcome in obsessive-compulsive patients. Report of a 2-year follow-up.

Twenty-five chronic obsessive-compulsive patients treated with flooding were investiaged retrospectively after 2 years by an independent assessor for the presence of depressive mood fluctuations during their life histories using a five-point rating scale. Patients themselves also completed rating scales for obsessional phenomena during the pre-, post-treatment, and follow-up assessment. Fifteen patients were characterized as not having exhibited mood changes and 10 as having such changes. Patients without changes responded promptly to flooding treatment and showed further improvement during follow-up. Patients with mood changes, although responding well to initially delivered flooding sessions, showed significant relapse at follow-up.

Adult↗

PubMed1976

Imaginal flooding and exposure to real phobic situations: treatment outcome with agoraphobic patients.

Each of thirty-six female agoraphobic out-patients were treated by one of three methods: 8 sessions of imaginal flooding followed by 8 sessions of practice in the real situation; 16 sessions of combined flooding and practice; or 16 sessions of practice alone. Three therapists treated equal numbers of patients in each group, and there was some evidence that patients' response varied according to the therapist seen, irrespective of treatment group. There were no significant differences between treatment groups after 8 sessions, 16 sessions or on six-month follow-up. It is concluded that there are no long-term differences between the effects of treatments involving exposure to either imaginal or real phobic situations or to a combination of both, provided that patients are encouraged to practise between sessions.

Agoraphobia↗

PubMed1976

Imaginal flooding and exposure to real phobic situations: changes during treatment.

This paper reports the results of measures taken during treatment in the study of imaginal flooding and exposure to real phobic situations previously described by Mathews, Johnston, Lancashire, Munby, Shaw and Gelder (1976). On weekly measures of change of similar reduction in phobic behaviour in all treatments was found, confirming the previous findings. Differences in therapist effectiveness were also confirmed. On measures of the immediate effects of treatment, exposure to the phobic situation had consistent positive effects, imaginal flooding had little or no detectable effect. It is proposed that the treatments studied differ in their immediate effects on phobic behaviour but also have the common effect of facilitating counterphobic behaviour outside the treatment situation, and that this is the main agent of therapeutic change.

Anxiety↗

PubMedDate not supplied

[Sulfate reduction and the water-soluble organic substances in a flooded petroleum bed].

The paper presents the analytical data for the hydrochemical and microbiological composition of the water in a stratum undergoing changes as a result of artificial flooding. The highest accumulation of biogenic H2S and the carbon of dissolved organic substance was found in diluted bed waters with mineralization of 17.17 g/litre. The composition of the bitumen carbon of dissolved organic substances changed with dilution of the stratum brine. The data thus obtained suggest the existence of an indirect relationship; oxidized dissolved organic substance--the rate of sulphate reduction. The nature of organic substance appearing in the petroleum stratum is discussed.

Gram-Negative Chemolithotrophic Bacteria↗

PubMed1979