Effects of Temperature, Sowing Depth and Soil Hardness On Seedling Establishment and Yield of Cambodian Rice Direct-Seeded in Flood Paddy Fields

Tong, Ly; Yoshida, Tomohiko; Maeda, Takao; Kimijima, Haruki

doi:10.1626/pps.10.129

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…Skoufias and Vinha (2012) indicated that an environmental shock might have an indirect impact but a direct negative impact on health. In the case of Cambodia, increasing the temperature or precipitation in different regions may show benefit or damage to crop yields, depending on the category of crops or the season that occurred (Tong, Yoshida, Maeda, & Kimijima, 2007). For that reason, changes in climate, such as temperature or precipitation, may negatively affect health conditions of households in rural areas as the higher temperature creates suitable conditions for diseases to develop (WHO, 2015).…”

Section: Introductionmentioning

confidence: 99%

Impact of climate change, climate variability and adaptation in the coastal area of Cambodia

Sum,

Thav

2023

APN SCI BULL

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Cambodia's coastal zones are highly dependent on climate and weather, making them susceptible to climate change and causing farmers’ livelihoods to be more vulnerable compared to urban residents. Since climate issues already impact the agricultural sector in Cambodia, this paper aims to assess the impact of disasters in the context of climate change, which impacts household agricultural production, and to identify the existing community's capacity to respond and adapt to climate change and climate variability in the coastal zones of Cambodia. A survey was conducted in the agricultural coastal zone provinces of Cambodia. Data was analysed using SPSS software. The survey data demonstrates that disasters and climate change, particularly drought and floods, significantly impact the economic status of the interviewed households. The proportion of households experiencing disasters and climate change impacts has increased gradually. Regarding household capacity to respond and adapt to disasters and climate change, households in the target area mainly focused on resilient farming techniques for rice crop production rather than other farming activities, and most of the practices were targeted to adaptation in the occurrence of droughts. The issue of receiving Early Warning Signs (EWS) information was addressed and 37% of the respondents reported “no source of climate information”. Therefore, it is recommended to strengthen the capacity of local people in the coastal areas of Cambodia in responding to climate change.

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Section: Introductionmentioning

confidence: 99%

Impact of climate change, climate variability and adaptation in the coastal area of Cambodia

Sum,

Thav

2023

APN SCI BULL

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“…In direct seeded rice production, when low temperatures occur, farmers often reduce the damage of low temperature to seedlings by irrigating a certain amount of shallow water to protect the seedlings [14]. Through this measure, the survival rate of seedling emergence can effectively increase, and the production risk of direct seeded rice can be reduced [15,16]. To date, many studies have investigated rice cultivation, physiological traits, genetic mechanisms and other aspects of injuries induced by low-temperature stress [17][18][19] and flooding stress [20,21].…”

Section: Introductionmentioning

confidence: 99%

Transcriptomic, proteomic, and physiological comparative analyses of flooding mitigation of the damage induced by low-temperature stress in direct seeded early indica rice at the seedling stage

Wang

Chen

et al. 2021

BMC Genomics

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Background Low temperature (LT) often occurs at the seedling stage in the early rice-growing season, especially for direct seeded early-season indica rice, and using flooding irrigation can mitigate LT damage in rice seedlings. The molecular mechanism by which flooding mitigates the damage induced by LT stress has not been fully elucidated. Thus, LT stress at 8 °C, LT accompanied by flooding (LTF) and CK (control) treatments were established for 3 days to determine the transcriptomic, proteomic and physiological response in direct seeded rice seedlings at the seedling stage. Results LT damaged chloroplasts, and thylakoid lamellae, and increased osmiophilic bodies and starch grains compared to CK, but LTF alleviated the damage to chloroplast structure caused by LT. The physiological characteristics of treated plants showed that compared with LT, LTF significantly increased the contents of rubisco, chlorophyll, PEPCK, ATP and GA3 but significantly decreased soluble protein, MDA and ABA contents. 4D-label-free quantitative proteomic profiling showed that photosynthesis-responsive proteins, such as phytochrome, as well as chlorophyll and the tricarboxylic acid cycle were significantly downregulated in LT/CK and LTF/CK comparison groups. However, compared with LT, phytochrome, chlorophyllide oxygenase activity and the glucan branching enzyme in LTF were significantly upregulated in rice leaves. Transcriptomic and proteomic studies identified 72,818 transcripts and 5639 proteins, and 4983 genes that were identified at both the transcriptome and proteome levels. Differentially expressed genes (DEGs) and differentially expressed proteins (DEPs) were significantly enriched in glycine, serine and threonine metabolism, biosynthesis of secondary metabolites, glycolysis/gluconeogenesis and metabolic pathways. Conclusion Through transcriptomic, proteomic and physiological analyses, we determined that a variety of metabolic pathway changes were induced by LT and LTF. GO and KEGG enrichment analyses demonstrated that DEGs and DEPs were associated with photosynthesis pathways, antioxidant enzymes and energy metabolism pathway-related proteins. Our study provided new insights for efforts to reduce the damage to direct seeded rice caused by low-temperature stress and provided a breeding target for low temperature flooding-resistant cultivars. Further analysis of translational regulation and metabolites may help to elucidate the molecular mechanisms by which flooding mitigates low-temperature stress in direct seeded early indica rice at the seedling stage.

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“…Despite these drawbacks, breeding, research, and selection to improve the eating quality of Koshihikari (again, used as the standard of comparison) have been done energetically in China (Lee et al 2010 , Liang et al 2013 , Sun et al 2006 ). The high seedling establishment of Koshihikari under both low temperature and deep-sowing conditions prompted the proposal to improve the direct-seeding suitability of Cambodian rice by using Koshihikari (Tong et al 2007 ), in spite of its long culm and low resistance to lodging.…”

Section: Introductionmentioning

confidence: 99%

Koshihikari: a premium short-grain rice cultivar – its expansion and breeding in Japan

Kobayashi¹,

Hori

Yamamoto

et al. 2018

Rice

123

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Koshihikari, a Japanese short-grain rice cultivar, was developed in 1956, more than 60 years ago. Despite its age, it has been the most widely grown cultivar in Japan for more than 35 years, making it the most important rice for the Japanese people. In its early days, there was no reason to predict that Koshihikari would become so widely disseminated. However, since the end of the post–World War II food shortage in the 1960s, Japanese preferences changed from high productivity to good eating quality. This triggered wide expansion of Koshihikari cultivation due to the cultivar’s excellent taste and texture. With increasing cultivation of Koshihikari in Japan, several good agronomic characteristics beyond its high eating quality became apparent, such as its good adaptation to different environments, tolerance to pre-harvest sprouting, and cold tolerance during the booting stage. These characteristics outweigh drawbacks such as its low blast resistance and low lodging resistance. The popularity of Koshihikari influenced subsequent rice breeding trends at regional agricultural experimental stations, and the characteristics of newly developed rice cultivars in Japan are usually rated relative to Koshihikari, which is used as the benchmark. Koshihikari was the first japonica rice cultivar whose whole genome has been sequenced by means of next-generation sequencing. Furthermore, comparison of the genomes of Koshihikari and Nipponbare has provided detailed insights into the genetic diversity of Japanese rice cultivars relative to that in rice populations elsewhere in the world. Further progress in rice genomics is gradually unlocking the mechanisms that underlie the agronomic characteristics of Koshihikari. To support both research and the development of novel rice cultivars, a series of isogenic and near-isogenic lines in the Koshihikari genetic background have been continuously developed. These new findings and materials will facilitate genomics-assisted rice breeding, eventually leading to superior cultivars.Electronic supplementary materialThe online version of this article (10.1186/s12284-018-0207-4) contains supplementary material, which is available to authorized users.

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Effects of Temperature, Sowing Depth and Soil Hardness On Seedling Establishment and Yield of Cambodian Rice Direct-Seeded in Flood Paddy Fields

Cited by 6 publications

References 13 publications

Impact of climate change, climate variability and adaptation in the coastal area of Cambodia

Impact of climate change, climate variability and adaptation in the coastal area of Cambodia

Transcriptomic, proteomic, and physiological comparative analyses of flooding mitigation of the damage induced by low-temperature stress in direct seeded early indica rice at the seedling stage

Koshihikari: a premium short-grain rice cultivar – its expansion and breeding in Japan

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