scholarly journals Drought tolerant rice breeding lines developed for rainfed lowland areas

2020 ◽  
Vol 423 ◽  
pp. 012019
Author(s):  
A Hairmansis ◽  
Yullianida ◽  
R Hermanasari ◽  
A P Lestari ◽  
P Sasmita ◽  
...  
Keyword(s):  
Rice Breeding ◽  
Breeding Lines ◽  
Drought Tolerant ◽  
Rainfed Lowland

Development of drought‐tolerant breeding lines derived from Helianthus annuus  ×  H. argophyllus interspecific crosses

2019 ◽  
Vol 138 (6) ◽  
pp. 862-870 ◽  
Author(s):  
Muhammad Mubashar Hussain ◽  
Saeed Rauf ◽  
Marilyn L. Warburton
Keyword(s):  
Helianthus Annuus ◽  
Interspecific Crosses ◽  
Breeding Lines ◽  
Drought Tolerant

Use of drought response index for identification of drought tolerant genotypes in rainfed lowland rice

2006 ◽  
Vol 99 (1) ◽  
pp. 48-58 ◽  
Author(s):  
Makara Ouk ◽  
J. Basnayake ◽  
M. Tsubo ◽  
S. Fukai ◽  
K.S. Fischer ◽  
...  
Keyword(s):  
Lowland Rice ◽  
Drought Response ◽  
Response Index ◽  
Drought Tolerant ◽  
Rainfed Lowland

scholarly journals Marker assisted introgression of bacterial blight resistant gene into submergence tolerance rice variety BRRI dhan52

2017 ◽  
Vol 42 (3) ◽  
pp. 403-411 ◽  
Author(s):  
ME Kabir ◽  
KM Iftekharuddaula ◽  
MAI Khan ◽  
MAK Mian ◽  
NA Ivy
Keyword(s):  
Resistance Genes ◽  
Bacterial Blight ◽  
Flash Flood ◽  
Rice Variety ◽  
High Yield ◽  
Recurrent Parent ◽  
Breeding Lines ◽  
Resistant Gene ◽  
Rainfed Lowland ◽  
Elite Breeding Lines

BRRI dhan52 is a uniquire submergence tolerant rice variety containing prominant genetic background of BR11, a mega rainfed lowland rice (RLR) variety of Bangladesh, but is susceptible to bacterial blight (BB) caused by Xanthomonas oryzae pv. oryzae (Xoo). The variety is considerably popular in the southern part of Bangladesh due to its high yield in flash flood condition and comparatvely medium slender grain. Molecular markers linked to BB resistance genes (Xa genes) and submergence QTL (SUB1) were utilized in a marker-aided selection program to develop elite breeding lines with broad-spectrum resistance to bacterial blight. Sequence tagged site (STS) and simple sequence repeat (SSR) markers were essentially used to detect the genes for BB and submergence as well. In backcross generation, markers closely linked to Xa21 and SUB1 QTL were used to select desirable plants possessing these resistance genes (foreground selection) and microsatellite markers polymorphic between donor and recurrent parent were also used to select plants that have maximum contribution from the recurrent parent genome (background selection). In BC1F1 generation, three best plants consiquently were selected from previously selected ten double heterozygous (Xa21 and SUB1 QTL) plants. The percentage of recipient genome recovery in the best plant 1, 2 and 3 were 78.7%, 75.83% and 75.4%, respectively. Eventually this work illustrates the successful application of marker-assisted breeding for introgression of bacterial blight resistant gene into a rice variety of Bangladesh.Bangladesh J. Agril. Res. 42(3): 403-411, September 2017

scholarly journals Potential Impact of Biotechnology on Adaption of Agriculture to Climate Change: The Case of Drought Tolerant Rice Breeding in Asia

2011 ◽  
Vol 3 (10) ◽  
pp. 1723-1741 ◽  
Author(s):  
Carl Pray ◽  
Latha Nagarajan ◽  
Luping Li ◽  
Jikun Huang ◽  
Ruifa Hu ◽  
...  
Keyword(s):  
Climate Change ◽  
Rice Breeding ◽  
Drought Tolerant ◽  
Potential Impact

Evaluation of cowpea (Vigna unguiculata (L.) Walp.) germplasm lines for tolerance to drought

2012 ◽  
Vol 10 (3) ◽  
pp. 171-176 ◽  
Author(s):  
Christian A. Fatokun ◽  
Ousmane Boukar ◽  
Satoru Muranaka
Keyword(s):  
Drought Tolerance ◽  
Sub Saharan Africa ◽  
Grain Legume ◽  
International Institute ◽  
Breeding Lines ◽  
Germplasm Collections ◽  
Legume Crop ◽  
Drought Tolerant ◽  
Cowpea Varieties ◽  
Sub Saharan

Cowpea is an important grain legume crop in sub-Saharan Africa (SSA) where, on a worldwide basis, the bulk is produced and consumed. The dry savanna area of SSA is where cowpea is mostly grown under rain-fed conditions. The crop is therefore prone to drought which may occur early, mid and/or late in the cropping season. Compared with many other crops, cowpea is drought tolerant, even though drought is still a major constraint limiting its productivity in SSA. Increasing the level of drought tolerance in existing cowpea varieties grown by farmers would enable them to obtain more and stable yield from their cowpea fields. As a first step towards enhancing drought tolerance in existing cowpea varieties, 1288 lines were selected randomly from cowpea germplasm collections maintained at the International Institute of Tropical Agriculture, and evaluated for their drought tolerance at Ibadan. Drought was imposed by withdrawal of irrigation from 5 weeks after sowing. On average, drought reduced the number of days to flower by 12 d, and the mean grain yield per plant was also reduced by 67.28%. A few of the cowpea lines stayed green for up to 6 weeks after irrigation was stopped, even though some of these produced no pods when the study was terminated. Further evaluation in the screenhouse of 142 selected drought-tolerant lines helped to identify six lines that could be potential parents for developing breeding lines with enhanced drought tolerance.

scholarly journals Evaluation of Drought Tolerance in Arkansas Cowpea Lines at Seedling Stage

HortScience ◽  
2020 ◽  
Vol 55 (7) ◽  
pp. 1132-1143
Author(s):  
Qirui Cui ◽  
Haizheng Xiong ◽  
Yufeng Yufeng ◽  
Stephen Eaton ◽  
Sora Imamura ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Block Design ◽  
Seedling Stage ◽  
University Of Arkansas ◽  
Drought Treatment ◽  
Breeding Lines ◽  
Drought Tolerant ◽  
Dry Conditions ◽  
Main Plot ◽  
The University

Cowpea [Vigna unguiculate (L.) Walp.] is not only a healthy, nutritious, and versatile leguminous crop; it also has a relatively high adaptation to drought. Research has shown that cowpea lines have a high tolerance to drought, and many of them can survive more than 40 days under scorching and dry conditions. The cowpea (Southern pea) breeding program at the University of Arkansas has been active for more than 50 years and has produced more than 1000 advanced breeding lines. The purpose of this study was to evaluate the drought-tolerant ability in Arkansas cowpea lines and use the drought-tolerant lines in cowpea production or as parents in cowpea breeding. A total of 36 University of Arkansas breeding lines were used to screen drought tolerance at the seedling stage in this study. The experiment was conducted in the greenhouse using a randomized complete block design (RCBD) with two replicates, organized in a split-plot manner, where the drought treatment (drought and nondrought stress) as the main plot and the cowpea genotypes as the subplot. Drought stress was applied for 4 weeks, and three drought-tolerant–related traits were collected and analyzed. Results showed that cowpea breeding lines: ‘17-61’, ‘17-86’, ‘Early Scarlet’, and ‘ARBlackeye #1’ were found to be drought tolerant.

scholarly journals Root and canopy traits and adaptability genes explain drought tolerance responses in winter wheat

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0242472
Author(s):  
A. S. Nehe ◽  
M. J. Foulkes ◽  
I. Ozturk ◽  
A. Rasheed ◽  
L. York ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Vegetation Index ◽  
Root Traits ◽  
Wheat Breeding ◽  
Root Number ◽  
Breeding Lines ◽  
Drought Tolerant ◽  
Green Area ◽  
High Throughput Phenotyping ◽  
Semiarid Conditions

Bread wheat (Triticum aestivum L) is one of the three main staple crops worldwide contributing 20% calories in the human diet. Drought stress is the main factor limiting yields and threatening food security, with climate change resulting in more frequent and intense drought. Developing drought-tolerant wheat cultivars is a promising way forward. The use of holistic approaches that include high-throughput phenotyping and genetic markers in selection could help in accelerating genetic gains. Fifty advanced breeding lines were selected from the CIMMYT Turkey winter wheat breeding program and studied under irrigated and semiarid conditions in two years. High-throughput phenotyping was done for wheat crown root traits and canopy senescence dynamics using vegetation indices (green area using RGB images and Normalized Difference Vegetation Index using spectral reflectance). In addition, genotyping by KASP markers for adaptability genes was done. Overall, under semiarid conditions yield reduced by 3.09 t ha-1 (-46.8%) compared to irrigated conditions. Genotypes responded differently under drought stress and genotypes 39 (VORONA/HD24-12//GUN/7/VEE#8//…/8/ALTAY), 18 (BiII98) and 29 (NIKIFOR//KROSHKA) were the most drought tolerant. Root traits including shallow nodal root angle under irrigated conditions and root number per shoot under semiarid conditions were correlated with increased grain yield. RGB based vegetation index measuring canopy green area at anthesis was better correlated with GY than NDVI was with GY under drought. The markers for five established functional genes (PRR73.A1 –flowering time, TEF-7A –grain size and weight, TaCwi.4A - yield under drought, Dreb1- drought tolerance, and ISBW11.GY.QTL.CANDIDATE- grain yield) were associated with different drought-tolerance traits in this experiment. We conclude that–genotypes 39, 18 and 29 could be used for drought tolerance breeding. The trait combinations of canopy green area at anthesis, and root number per shoot along with key drought adaptability makers (TaCwi.4A and Dreb1) could be used in screening drought tolerance wheat breeding lines.

scholarly journals Screening the USDA Watermelon Germplasm Collection for Drought Tolerance at the Seedling Stage

HortScience ◽  
2011 ◽  
Vol 46 (9) ◽  
pp. 1245-1248 ◽  
Author(s):  
Haiying Zhang ◽  
Guoyi Gong ◽  
Shaogui Guo ◽  
Yi Ren ◽  
Yong Xu ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Clustering Analysis ◽  
Growth And Development ◽  
Citrullus Lanatus ◽  
Germplasm Collection ◽  
Normal Growth ◽  
Seedling Stage ◽  
Breeding Lines ◽  
Germplasm Collections ◽  
Drought Tolerant

Because of the growing threat of global warming, drought stress could severely affect the normal growth and development of crop plants. To alleviate such an adverse effect, there is a need to screen watermelon germplasm collections to identify genetic sources for potential drought tolerance. In the present study, 820 accessions of USDA's Citrullus PIs and 246 watermelon breeding lines were evaluated for their drought tolerance at the seedling stage under extreme water stress conditions in a greenhouse. Significant variations in drought tolerance were observed in the Citrullus germplasm collections. Using fast clustering analysis, the tested watermelon materials could be assigned into four groups, including tolerant, intermediate tolerant, moderately sensitive, and sensitive, respectively. The most drought-tolerant Citrullus germplasm, including 13 Citrullus lanatus var. lanatus and 12 C. lanatus var. citroides accessions, were originated from Africa. These genetic materials could be used for rootstock breeding or for developing drought-tolerant watermelon cultivars.

scholarly journals Resistance in Rice Breeding Lines to the Blast Fungus in Nepal

1970 ◽  
Vol 6 ◽  
pp. 49-56 ◽  
Author(s):  
Bedanand Chaudhary ◽  
Sundar M Shrestha ◽  
Ram C Sharma
Keyword(s):  
Field Condition ◽  
Blast Resistance ◽  
Quantitative Resistance ◽  
Rice Breeding ◽  
Breeding Lines ◽  
Research Journal ◽  
Neck Blast ◽  
Upland Field ◽  
Major Resistance Genes ◽  
Greenhouse Assay

A total of 36 rice breeding lines including checks were evaluated for resistance to blast atRampur during 2000-2001. The experiments were conducted under both field condition andgreenhouse inoculated condition. Qualitative resistance in rice to blast was assessed based onlesion type, whereas quantitative resistance was assessed based on area under disease progresscurve (AUDPC) in the upland field condition. The number of sporulating lesions and the numberof leaves with at least one sporulating lesion per plant were considered as measures forevaluation of quantitative resistance in the greenhouse assay. The lesion type, neck blastpercentage and AUDPC data suggest that most of the rice lines possess higher level of resistanceto leaf and neck blast. The rice lines varied for the number of sporulating lesions and the numberof leaves with sporulating lesion per plant. Some lines were incompatible to virulent blastisolates, showing major resistance genes. NR 1558, NR 601-1-1-9, BW306-2 and CN 836-3-10were promising lines for quantitative resistance to both leaf and neck blast. Radha 12, Sabitri,Janaki possess higher level of quantitative resistance to blast, hence these could be promoted forcultivation in blast-prone environments. These genotypes could also be utilized as donor parentsfor breeding durable blast resistant varieties. The most virulent blast isolate could be used forevaluation of both qualitative and quantitative resistance to blast in early generation in thegreenhouse so that workload could be cut down in future works.Key words: Blast resistance; field condition; greenhouse assay; Pyricularia grisea; rice linesDOI: 10.3126/narj.v6i0.3344Nepal Agriculture Research Journal Vol.6 2005 pp.49-56

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