Identification and functional analysis of flowering time genes that enable stable rice production by conferring regional adaptability on rice varieties

The study investigated the adoption of improved rice varieties by farmers in Bende Local Government Area, Abia State, Nigeria. A multi-stage random sampling technique was used to select a total of 120 rice farmers. Descriptive statistics and tobit regression model were employed to analyze the data. Results showed that cumulatively 73.3% of the farmers fell within the age range of 20-50 years, most (86.7%) of the rice farmers were literate. More than half (57.5%) of the rice farmers are females. Result further indicated that 43.3% had household sizes of 5-8 persons. A fair proportion (33.3%) had been in rice production for 11-15 years, while majority (73.3%) belongs to farmers’ associations. Fairly good (51.6%) were aware of the improved rice varieties and used it, while a substantial number (93.3%) number of the farmers cultivated swamp rice. MAS 240 variety (mean=3.13), Faro 7 variety (mean=2.95), Faro II variety (mean=2.75), Faro 8 variety (mean=2.70.) and Faro 48 variety (mean=2.68) were highly adopted by farmers in the area. The Chi square value of 7.290 was significant at 1.0% probability level and indicates goodness of fit of the model used. Coefficient of age (-0.023), and gender (-1.967) were negative and significant at 10.0% and 1.0% level of probability respectively. The coefficient of education level (0.041), farm size (0.940), farming experience (0.206) and membership of farmers’ association (0.168) were significant at 5.0% and were positively related to adoption of improved rice varieties. Farmers encountered various problems of paucity of funds (35.8%), scarcity of inputs (22.5%), and dearth of information (20.89). Based on these findings it was recommended that rice farmers should form cooperative societies to enable them raise funds for buying agricultural equipment to boost rice production. More young male farmers should be sensitized and motivated by the state government to take up rice production since female farmers dominate rice production in the area. Extension agencies should increase the level of information dissemination and teaching to the rice farmers’ clientele.Key words: Adoption, Improved Varieties, Rice

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Advances in Developing Multigene Abiotic and Biotic Stress-Tolerant Rice Varieties

10.5772/intechopen.93751 ◽

2020 ◽

Author(s):

Nitika Sandhu ◽

Shailesh Yadav ◽

Arvind Kumar

Keyword(s):

Abiotic Stresses ◽

Major Effect ◽

Rice Production ◽

Abiotic And Biotic Stress ◽

Rice Varieties ◽

Crop Species ◽

Multiple Stresses ◽

Global Food Security ◽

Biotic Stresses ◽

Global Food

Increasing incidences of multiple abiotic stresses together with increasing population are the major constraints to attain the global food security. Rice, the major staple food crop is very much prone to various abiotic and biotic stresses, which can occur one at a time or two or more together in a single crop growing season and adversely affects the rice production and productivity. The devastating effect of multiple stresses on rice crop is much more erratic and complex leading to higher losses in the crop grain yield. The concurrent occurrence of multiple streeses can destroy rice production in many of the rainfed areas of South and Southeast-Asia. Genomics-assisted breeding strategies have been instrumental in introgression of various major effect QTLs/genes into rice mega varieties and have proven successful in achieving the desired level of tolerance/resistance to various abiotic stresses in diffferent crop species. Keeping the present scenario of changing climate in mind, the chapter discusses the recent past success in combining tolerance to two or more abiotic stresses in mega rice varieties applying genomics-assisted breeding and development of high-yielding climate resilient rice through stacking of multiple genes/QTLs, which can withstand in a cascade of multiple stresses occurring regularly in rainfed environments.

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Productivity and Yield Quality of Intersubspecies Crossing of Japonica-Indica

Buletin Plasma Nutfah ◽

10.21082/blpn.v24n1.2018.p19-30 ◽

2018 ◽

Vol 24 (1) ◽

pp. 19

Author(s):

Sobrizal Sobrizal ◽

Carkum Carkum ◽

Wijaya M. Indriatama ◽

Aryanti Aryanti ◽

Ita Dwimahyani

Keyword(s):

Genetic Variability ◽

Amylose Content ◽

Rice Production ◽

High Yield ◽

Food Crops ◽

Milled Rice ◽

Rice Varieties ◽

Pests And Diseases ◽

Self Sufficiency ◽

Yield Quality

In the middle of 1980s, rice self-sufficiency in Indonesia has been achieved, but the growth of rice production slowed down since the 1990s. Narrow genetic variability of released rice varieties contributed largely to the occurrence of leveling of potential rice yield over the past decades. To enlarge the genetic variability, an intersubspecies crossing of Koshihikari (japonica) and IR36 (indica) has been performed. Through this crossing, three high yielding and high yield quality promising lines of KI 37, KI 238, and KI 730 have been obtained. The objective of this study was to evaluate the superiorities of these lines through multi-location yield trials, pests, diseases, and grain qualities examinations. Examination methods used followed the release food crops variety procedure issued by the Indonesian Ministry of Agriculture. The result of examinations showed that the average yield of KI 730 was 7.47 t/ha, it was significantly higher than that of Ciherang (6,73 t/ha). KI 730 has a good grain quality, with translucent milled rice, a high percentage of milled rice (78.0%) and head rice (91.01%). The texture of its cooking rice was soft, sticky, with the amylose content of 20.41%. In addition, pests and diseases resistances of KI 730 were better than those of other lines tested. After evaluation by National Food Crops Release Variety Team, the KI 730 line was released as a national superior variety with the name of Tropiko. Tropiko should become an alternative variety to grow widely in order to increase national rice production and farmers income.

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The Identification of Rice Varieties Used in Central Sulawesi

E3S Web of Conferences ◽

10.1051/e3sconf/202123203013 ◽

2021 ◽

Vol 232 ◽

pp. 03013

Author(s):

Femmi Norfahmi ◽

Komalawati Komalawati ◽

Muh. Afif Juradi ◽

Mardiana Mardiana ◽

F.F. Munier

Keyword(s):

Secondary Data ◽

Rice Production ◽

Rice Varieties ◽

Local Varieties ◽

Rice Productivity ◽

Pests And Diseases ◽

High Yielding Varieties ◽

Central Sulawesi

Central Sulawesi’s rice productivity in 2019 was lower compared to that in 2018. One of the problems for the low productivity of paddy in Central Sulawesi is the application of low quality of seeds. Ministry of Agriculture through Central Sulawesi AIAT has introduced a numbers of new high yielding varieties (HYV) to increase rice production and productivity. To support the dissemination of new HYV, it is important to study the rice varieties that mostly used by farmers in Central Sulawesi. The objectives of this study are to identify the rice varieties and the preferred characteristics of rice varieties that farmers usually used in Central Sulawesi. This study used primary and secondary data. Data were analyzed descriptively and presented in tables and graphs. The results show that most farmers in Central Sulawesi use Mekongga, Ciherang, and Cisantana varieties, and local varieties such as Peluncur, Dewi, Ntabone and others. Farmers generally prefer varieties which tend to produce higher yields and resistant to pests and diseases. To maintain the availability of the varieties in Central Sulawesi, it is important to train farmers to become breeders.

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Utilization of Molecular Markers for Rice Breeding

Jurnal AgroBiogen ◽

10.21082/jbio.v17n1.2021.p45-62 ◽

2021 ◽

Vol 17 (1) ◽

pp. 45

Author(s):

Tasliah Tasliah

Keyword(s):

Molecular Markers ◽

Abiotic Stresses ◽

Rice Production ◽

Phosphate Deficiency ◽

Yield Potential ◽

Rflp Markers ◽

Eating Quality ◽

Rice Breeding ◽

Rice Varieties ◽

Early Maturity

Rice is the staple food for more than half of the world's population. Rice production in 2050 must increase by at least 50% to keep up with the population growth. Efforts to increase rice production continue using various strategies. Breeders apply multiple approaches including application of molecular markers in developing varieties better than the previous ones. Since the discovery of the restriction fragment length polymorphism (RFLP) markers in 1980s and the development of polymerase chain reaction (PCR) method, many types of molecular markers have been developed and applied to various crops including rice. Various molecular approaches to map genetic loci associated with rice superior traits were conducted. The mapped loci are very useful for rice breeding purposes. This paper reports the results of mapping and breeding economically important traits in rice, mainly those related to abiotic stresses, agronomic traits, yield, and yield quality. These included characters of semidwarf stature, aromatic grain, high yield potential, eating quality, higher Zn and Fe grain, more tolerant to abiotic stresses, such as salinity, drought, phosphate deficiency, Al toxicity and Fe toxicity, submergence, as well as early maturity character. The mapped characters can be transferred using marker-assisted backcrossing (MABC) method into cultivated rice genotypes well-adopted by farmers. Several countries including Indonesia have benefited from this breeding method, and Indonesia have released several rice varieties developed through MABC. These include rice varieties such as Code, Angke, Inpari 30, Inpari Blas, Inpari HDB, Bio Patenggang Agritan, and Bioni 63 Ciherang Agritan

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Sequence and functional analysis of a TERMINAL FLOWER 1 homolog from Brassica juncea: a putative biotechnological tool for flowering time adjustment

GM crops & food ◽

10.1080/21645698.2019.1707340 ◽

2019 ◽

Vol 11 (2) ◽

pp. 79-92

Author(s):

Mohsen Asadi Khanouki ◽

Farkhondeh Rezanejad ◽

Anthony A. Millar

Keyword(s):

Functional Analysis ◽

Flowering Time ◽

Brassica Juncea ◽

Terminal Flower ◽

Terminal Flower 1

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Integrating Statistical and System Dynamics Modelling to Analyse the Impacts of Climate Change on Rice Production in West Nusa Tenggara, Indonesia

10.26686/wgtn.17060483.v1 ◽

2021 ◽

Author(s):

◽

Muhamad Bahri

Keyword(s):

Climate Change ◽

System Dynamics ◽

Statistical Models ◽

Rice Yield ◽

Rice Production ◽

Maximum Temperature ◽

Dynamics Model ◽

Rice Varieties ◽

Changing Climate ◽

Impacts Of Climate Change

Climate change, manifested as temperature rise and rainfall change, will pose significant challenges to rice farmers, leading to a possible rice shortage under a changing climate. This research aims to understand the impacts of climate variability and change on rice production through the rest of this century using Representative Concentration Pathway (RCP) scenarios, and combination of statistical and system dynamic modelling. The area of study is West Nusa Tenggara, Indonesia. Wetland and dryland farming types are assessed separately because they have different rice varieties and different agricultural practices. Overall, the research seeks to answer the question: How will climate change and climate variability affect rice production? Additional questions investigated are (1) What are the most significant supply uncertainties associated with a changing climate? and (2) What are possible solutions for reducing the impacts of climate change on rice production?. To answer these research questions, this study deals with three main research areas. First, based on observed data (1976-2011), this study developed regression-based statistical models in understanding the impacts of climate change on rice yield in West Nusa Tenggara. Statistical models find that the negative impacts of increased minimum temperature on rice yield are statistically significant. By contrast, the effects of maximum temperature on rice yield are not statistically significant. A key reason for this is that the highest maximum temperature (32⁰C) in the observed period (1976-2011) was lower than 35⁰C, a rice threshold for maximum temperature. By 2090 (2077-2100), rice yield in wetland and dryland is projected to decrease by about 3% (RCP2.6 scenario), 4% (RCP4.5 scenario), 5% (RCP6.0 scenario) and 14% (RCP8.5 scenario). Second, a system dynamics model was developed to assess the impacts of climate change on three issues including rice yield, harvested areas and rice production by 2090 (2077-2100). After embedding statistical models and estimating the impacts of maximum temperature on rice yield based on existing studies, the impacts of climate change on rice yield are projected. The system dynamics model is also equipped by August SOI to estimate the impacts of climate change on the timing of monsoon onset i.e the beginning of planting seasons. For assessing harvested areas under a changing climate, the system dynamics model is equipped by a mathematical relationship between seasonal rainfall and harvested areas. Because the system dynamics model includes the impacts of high maximum temperature, the projected loss of rice yield in wetland and dryland is relatively higher compared to that in statistical models. It is projected that rice yield loss will be about 3% (RCP2.6 scenario), 6% (RCP4.5 scenario), 10% (RCP6.0 scenario) and 23% (RCP8.5 scenario) by 2090 (2077-2100). Likewise, rice production loss in wetland and dryland is projected to be about 1% (RCP2.6 scenario), 2% (RCP4.5 scenario), 7% (RCP6.0 scenario) and 19% (RCP8.5 scenario) by 2090 (2077-2100). The projected loss of rice production is relatively lower than rice yield loss as wetland harvested areas are projected to experience a slight increase about 3% by 2090 (2077-2100) under a changing climate. This also means that the ranking of the impacts of climate change from the most significant to the least significant is its impact on rice yield, rice production and harvested areas. Third, policy options in overcoming the impacts of climate change on rice production are assessed. This study suggests that research on finding rice varieties with three main traits: heat tolerance, short growth duration and high yield is key to balance rice demand and rice supply in West Nusa Tenggara by 2090 (2077-2100). A failure to improve rice yield in such ways is likely to lead to significant reductions in rice supply in the face of climate change. This study makes theoretical contributions, including the development of statistical models for understanding the impacts of climate change on rice yield and a causal system for investigating the impacts of climate change on rice yield, rice production and harvested areas. Again, the combination of statistical and system dynamics modelling simultaneously investigates the impacts of climate change on rice yield, rice production and harvested areas. This means that this study provides a more holistic view of the impacts of climate change compared to existing studies. This study also offers practical contributions, advising that declining rice research should be avoided under a changing climate, and suggesting that farming intensification (more climate-resilient rice varieties) is more effective than farming extension (area expansion) in sustaining rice production under a changing climate. Again, research on developing more resilient-climate rice varieties is possible as projected rice yield in sustaining rice production by 2090 (2077-2100) is similar to rice’s yield potential.

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Advanced Breeding Strategies and Future Perspectives of Salinity Tolerance in Rice

Agronomy ◽

10.3390/agronomy11081631 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1631

Author(s):

Md Azadul Haque ◽

Mohd Y. Rafii ◽

Martini Mohammad Yusoff ◽

Nusaibah Syd Ali ◽

Oladosu Yusuff ◽

...

Keyword(s):

Genome Editing ◽

Salinity Stress ◽

Salinity Tolerance ◽

High Salinity ◽

Abiotic Factors ◽

Rice Production ◽

Salt Tolerant ◽

Rice Varieties ◽

Rice Plants ◽

Breeding Techniques

Rice, generally classified as a typical glycophyte, often faces abiotic stresses such as excessive drought, high salinity, prolonged submergence, cold, and temperature, which significantly affects growth, development, and ultimately, grain yield. Among these negative impacts of abiotic factors in rice production, salinity stress is a major constraint, followed by drought. There is considerable research on the use of marker-assisted selection (MAS), genome editing techniques, and transgenic studies that have profoundly improved the present-day rice breeders’ toolboxes for developing salt-tolerant varieties. Salinity stresses significantly affect rice plants during seedling and reproductive stages. Hence, greater understanding and manipulation of genetic architecture in developing salt-tolerant rice varieties will significantly impact sustainable rice production. Rice plants’ susceptibility or tolerance to high salinity has been reported to be the result of coordinated actions of multiple stress-responsive quantitative trait loci (QTLs)/genes. This paper reviews recent literature, updating the effects of salinity stress on rice plants and germplasm collections and screening for salinity tolerance by different breeding techniques. Mapping and identification of QTLs salt tolerance genes are illuminated. The present review updates recent breeding for improvement in rice tolerance to salinity stress and how state-of-the-art tools such as MAS or genetic engineering and genome editing techniques, including mutagenesis and conventional breeding techniques, can assist in transferring salt-tolerant QTLs genes into elite rice genotypes, accelerating breeding of salt-resistant rice cultivars.

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PEMANFAATAN PIRAMIDA GEN KETAHANAN TERHADAP PENYAKIT HAWAR DAUN BAKTERI DALAM MENDUKUNG PERAKITAN VARIETAS UNGGUL PADI Application of Gene Pyramiding For Resistance to Bacterial Leaf Blight to Develop New Rice Variety

Jurnal Penelitian dan Pengembangan Pertanian ◽

10.21082/jp3.v39n1.2020.p11-20 ◽

2020 ◽

Vol 39 (1) ◽

pp. 11

Author(s):

Fatimah Fatimah ◽

Joko Prasetiyono

Keyword(s):

Molecular Marker ◽

Rice Variety ◽

Gene Pyramiding ◽

Leaf Blight ◽

Rice Production ◽

Xanthomonas Oryzae ◽

Bacterial Leaf Blight ◽

Yield Potential ◽

Rice Varieties ◽

Marker Assisted Backcrossing

Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv oryzae (Xoo) is an important bacterial disease and very destructive to rice plant. BLB decreased rice production from 20%-30% up to 80%. Host-plant resistance is a cost-effective and environmentally safe approach to reduce yield loss. However the development of new rice variety by conventional selection would take several years. The genetic improvement in rice production considered as a vital program in order to ensure national food security. The availability of corresponding molecular marker makes it more precision and efficient by reducing the time required for selection. This present article highlights the molecular approach in breeding for BLB disease resistant rice varieties. In detail, it will be discussed the application of molecular marker assisted backcrossing and pyramiding gene resistance offered breeders to accelerate the rice breeding program for resistance to BLB. The pyramiding of three resistance BLB genes (xa5, Xa7, and Xa21and one gene (Xa4) as a background into two elite indica rice varieties, Ciherang and Inpari 13, was introduced successfully. The combining of conventional breeding, marker assisted backcrossing, disease evaluation, agronomic performance and yield has led the significant resistance of pyramid lines to Xoo Race III, IV and VIII in vegetative and generative phase while their yield potential was maintained (6-7 ton/ha). The current status of Ciherang-HDB and Inpari 13-HDB pyramid lines is the production of nucleoseeds and breeder seeds. This broad spectrum and durable resistance characteristic may help in controlling BLB disease in different region of Indonesia and it will facilitate the rice self-sustainability program.Keywords: Rice, gene pyramiding, plant breeding, molecular marker. AbstrakPenyakit hawar daun bakteri (HDB) yang disebabkan oleh Xanthomonas oryzae pv oryzae (Xoo) merupakan penyakit penting pada tanaman padi karena dapat menurunkan produksi padi rata-rata 20-30% bahkan dapat mencapai 80%. Penggunaan varietas tahan merupakan cara pengendalian yang paling efektif, ramah lingkungan, dan mudah dilakukan. Namun pengembangan varietas unggul baru melalui seleksi konvensional memerlukan waktu lebih lama. Perbaikan varietas padi perlu terus dikembangkan dalam mendukung ketahanan pangan dan kemandirian pangan nasional. Tersedianya marka molekuler membantu proses pemuliaan tanaman menjadi lebih presisi dan lebih efisien sehingga mengurangi waktu seleksi pada tanaman progeni. Tulisan ini memfokuskan pendekatan molekuler dalam pemuliaan varietas tahan penyakit HDB melalui piramida gen ketahanan untuk mempercepat progam pemuliaan padi tahan penyakit HDB. Kegiatan menggabungkan tiga gen ketahanan (xa5, Xa7, dan Xa21) dan satu gen (Xa4) sebagai background ke dalam padi varietas Ciherang dan Inpari-13 telah berhasil dilakukan. Melalui penggabungan beberapa pendekatan yaitu pemuliaan konvensional dan silang balik berbantu marka, evaluasi penyakit dan keragaan agronomi serta komponen hasil telah menunjukkan peningkatan ketahanan yang nyata pada galur-galur piramida Ciherang HDB dan Inpari-13 HDB pada tiga ras Xoo (Ras III, IV, dan VIII), baik pada fase vegetatif maupun generatif dengan potensi hasil tidak berbeda nyata dengan tetuanya (6-7 t/ha). Saat ini sudah diproduksi benih inti (NS) dan benih penjenis (BS) galur-galur piramida Ciherang HDB dan Inpari-13 HDB. Dengan demikian, galur-galur piramida memiliki spektrum yang luas dan mampu bertahan dalam jangka waktu lama sehingga dapat mengontrol penyakit HDB di berbagai wilayah Indonesia dan mendukung target pemerintah untuk mempertahankan swasembada beras secara berkelanjutan.Kata kunci: Padi, piramida gen, pemuliaan tanaman, marka molekuler.

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A Comparative Economic Analysis of Salt Tolerant Binadhan-8 and BR-28 Rice Production in Satkhira District of Bangladesh

Progressive Agriculture ◽

10.3329/pa.v22i1-2.16481 ◽

2013 ◽

Vol 22 (1-2) ◽

pp. 203-212

Author(s):

KA Kana ◽

MHA Rashid ◽

MM Islam ◽

MA Baree

Keyword(s):

Functional Analysis ◽

Regression Analysis ◽

Economic Analysis ◽

Rice Production ◽

Salt Tolerant ◽

Total Cost ◽

Power Tiller

This study was conducted to compare the profitability of salt tolerant Binadhan-8 and BR-28 production in coastal Satkhira district of Bangladesh. Thirty salt tolerant Binadhan8 producing farmers were purposively selected since the introduction of this paddy is new in that area. Another 30 BR-28 producing farmers were selected randomly from the farmers list obtained from the Upazila Agriculture Office. Data were collected using pre-tested structured questionnaires. Cost and return analysis as well as functional analysis were performed in this study. The results of the study revealed that per hectare total cost for Binadhan-8 was higher than BR-28 rice. Taking the production into account the total return of Binadhan-8 per hectare was higher than the total return of BR-28 rice per hectare. The sample farmer appeared to have used seeds, Urea, TSP, MP, etc. at less than the required level. Regression analysis suggests that the Binadhan-8 rice growers should limit the use of power tiller and insecticide. Contribution of these inputs to the two varieties was found to be positive but at decreasing rate for BR-28 and at increasing rate for Binadhan-8. DOI: http://dx.doi.org/10.3329/pa.v22i1-2.16481 Progress. Agric. 22(1 & 2): 203-212, 2011

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