scholarly journals Evaluation of Rice (Oryza sativa L.) Genotypes at Germination and Early Seedling Stage for Their Tolerance to Salinity

1970 ◽  
Vol 8 (2) ◽  
pp. 57-65 ◽  
Author(s):  
MM Islam ◽  
MA Karim
Keyword(s):  
Oryza Sativa ◽  
Oryza Sativa L ◽  
Dry Weight ◽  
Seedling Stage ◽  
Saline Condition ◽  
Salt Tolerant ◽  
Early Seedling ◽  
Rice Genotypes ◽  
Tolerance To Salinity ◽  
Cacl2 Solution

An experiment was conducted at the Laboratory of Agronomy Department, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur from July-June, 2009-2010 to evaluate the rice (Oryza sativa L.) genotypes for their tolerance to salinity. One hundred rice genotypes and two check cultivars (Pokkali as tolerant and IR29 as susceptible) were exposed to solution of Electrical Conductivity (EC) of 10, 15, and 20 dSm-1 (5:1 molar concentration of NaCl and CaCl2 solution) at germination and early seedling stage. Based on visual salt injury symptoms at 15 dSm-1, 13 genotypes were found fairly tolerant to salinity. However, among the 13 genotypes, only Patnai23 showed higher germination index and seedling relative dry weight than the check salt tolerant Pokkali at 15 dSm-1. Beside these, performance of Awned-1, Nonasail and Soloi was also well at this level. The genotypes Patnai23, Awned-1, Nonasail and Soloi showed the best performance under saline condition. Keywords: Rice genotypes; germination; salinity; tolerance DOI: 10.3329/agric.v8i2.7578   The Agriculturists 8(2): 57-65 (2010)   

scholarly journals Evaluation of Rice (Oryza sativa L.) Genotypes for Drought Tolerance at Germination and Early Seedling Stage

2018 ◽  
Vol 16 (1) ◽  
pp. 44-54 ◽  
Author(s):  
M M Islam ◽  
E Kayesh ◽  
E Zaman ◽  
T A Urmi ◽  
M M Haque
Keyword(s):  
Oryza Sativa ◽  
Water Stress ◽  
Drought Stress ◽  
Drought Tolerance ◽  
Evaluation System ◽  
Oryza Sativa L ◽  
Dry Weight ◽  
Seedling Height ◽  
Early Seedling ◽  
Rice Genotypes

Drought stress is a major constraint to the production and yield stability of crops. Rice (Oryza sativa L.) is considered as a drought-sensitive crop species. Within this species, there are considerable varietal differences in sensitivity to this environmental stress. An experiment was conducted at the laboratory of the Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Bangladesh during April to September 2016 to evaluate 100 rice genotypes for drought tolerance during germination and early seedling growth stage. The genotypes were tested against five levels of drought stress imposed by Polyethylene glycol 6000 (PEG-6000) @ 0, 5, 10, 15 and 20%. The experiment was laid out in a complete randomized design with four replications. The results showed that with increasing water stress, germination in all the genotypes decreased from 95.8% in control to 6.6 % in highest stress (20% PEG) level. Seedling height and dry weight also decreased in all rice genotypes with the increase in water stress level. Based on Standard Evaluation System (SES),18 genotypes were selected primarily. Among the 18 genotypes, Ratoil and Chinisakkar showed higher germination index, relative seedling height and relative seedling dry weight than the check drought tolerant BRRI dhan43 at 20% PEG. Beside these, performance of Kumridhan, Pusur and Somondori was also well at this level compared to BRRI dhan43. The genotypes Ratoil, Chinisakkar, Kumridhan, Pusur and Somondori showed the best performance under drought condition. The Agriculturists 2018; 16(1) 44-54

scholarly journals Screening of Some Rice (Oryza sativa L.) Genotypes for Salinity Tolerance using Morphological and Molecular Markers

2019 ◽  
Vol 16 (2) ◽  
pp. 377-390
Author(s):  
Shahabuddin Ahmed ◽  
Touhidur Rahman Anik ◽  
Ashraful Islam ◽  
Imtiaz Uddin ◽  
Mohammad S. Haque
Keyword(s):  
Oryza Sativa L ◽  
Rice Variety ◽  
Dry Weight ◽  
Crop Productivity ◽  
Seedling Stage ◽  
Group Method ◽  
Salt Tolerant ◽  
Pair Group ◽  
Salinity Levels ◽  
Rice Genotypes

Salinity is one of the major abiotic stresses, which adversely affects the crop productivity. Thirty rice genotypes of diverse origin including three salt tolerant check varieties, Binadhan-8, Binadhan-10 and Pokkali, were used to evaluate salt tolerance at seedling stage and to determine the genetic diversity using microsatellite markers. Salinity screening was done at the seedling stage using hydroponic system following IRRI standard protocol. Three salinity levels as 6dSm-1, 8dSm-1, and 10dSm-1 were used along with control. Data were recorded on root length, shoot length and dry weight and the genotypes were scored based on modified standard evaluation score (SES) for visual injury. Sixteen SSR markers were used to study the genetic variation within 30 rice genotypes. A total of 65 alleles with an average of 4.06 allele per locus were detected among 30 rice genotypes. The polymorphism information content (PIC) value ranged from 0.24 to 0.86 with an average of 0.51. The unweighted pair group method with arithmetic mean (UPGMA) dendrogram revealed four clusters. Among them cluster I identified 5 salt tolerant genotypes and cluster IV separated one tolerant and one moderately tolerant genotype. Based on SES evaluation and molecular analysis genotypes Balam, THDB, Q-31, Ab.Hai, BR-5, FR13A ware salt tolerant; Moulota, Super hybrid, Y-1281, Binadhan-16 were moderate salt tolerant. This information could be useful for selection of suitable genotypes for developing salt tolerant rice variety through molecular breeding.

scholarly journals Physiological Evaluation of Different Rice Genotypes to Two Salinity Level during Seedling Stage under Hydroponic System

2020 ◽  
pp. 42-56
Author(s):  
S. Lakshmi ◽  
V. Ravichandran ◽  
L. Arul ◽  
K. Krishna Surendar
Keyword(s):  
Salt Stress ◽  
Dry Weight ◽  
Seedling Stage ◽  
Salinity Level ◽  
Ion Concentration ◽  
Growth And Yield ◽  
Root Shoot Ratio ◽  
Ion Absorption ◽  
Early Seedling ◽  
Rice Genotypes

Hydroponics study was conducted to screen eight rice genotypes (CO 51, ADT 53, ADT 37, IR 64, CO 43, ASD 16, Pokkali; TRY 3) under salinity stress on early seedling stage. Two Saline treatments (75 and 100 mM NaCl) were given at 15 days old seedling; observations were recorded at 10 days after salt stress. Results showed that shoot length, root length, total fresh and dry weight, shoot and root fresh weight, shoot and root dry weight and root- shoot ratio were reduced under saline conditions compared to control. Na+ ion Concentration and Na+/ k+ ratio was higher in saline treatments than control. However, K+ ion absorption decreased with increasing salinity level. Electrolyte leakage and osmotic potential had increasing trend with increasing level of salinity. In this study, rice genotypes Pokkali, TRY 3 and CO 43 perform as tolerant; CO 51, ADT 53 and ASD 16 perform as moderately tolerant; ADT 37 is susceptible and IR 64 is highly susceptible. This type of study is required to develop salt tolerant genotypes at salt stress during seedling stage; to increase the growth and yield of rice there by satisfy the need of country’s requirement.

Differential expression of salt-responsive genes to salinity stress in salt-tolerant and salt-sensitive rice (Oryza sativa L.) at seedling stage

PROTOPLASMA ◽  
2018 ◽  
Vol 255 (6) ◽  
pp. 1667-1681 ◽  
Author(s):  
Vijayata Singh ◽  
Ajit Pal Singh ◽  
Jyoti Bhadoria ◽  
Jitender Giri ◽  
Jogendra Singh ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Differential Expression ◽  
Salinity Stress ◽  
Oryza Sativa L ◽  
Seedling Stage ◽  
Salt Tolerant

scholarly journals Evaluation and clustering on salt-tolerant ability in rice genotypes (Oryza sativa L. subsp. indica) using multivariate physiological indices

2019 ◽  
Vol 25 (2) ◽  
pp. 473-483 ◽  
Author(s):  
Wasinee Pongprayoon ◽  
Rujira Tisarum ◽  
Cattarin Theerawittaya ◽  
Suriyan Cha-um
Keyword(s):  
Oryza Sativa ◽  
Oryza Sativa L ◽  
Salt Tolerant ◽  
Physiological Indices ◽  
Rice Genotypes

scholarly journals Screening of Rice (Oryza sativa L.) Genotypes at Reproductive Stage for their Tolerance to Salinity

2018 ◽  
Vol 16 (1) ◽  
pp. 65-77
Author(s):  
M M Islam ◽  
M H Faruqe ◽  
M S Rana ◽  
M Akter ◽  
M A Karim
Keyword(s):  
Oryza Sativa ◽  
Salt Tolerance ◽  
Grain Yield ◽  
Oryza Sativa L ◽  
Saline Water ◽  
Coastal Zones ◽  
Salt Tolerant ◽  
Randomized Design ◽  
Rice Genotypes ◽  
Four Levels

Soil salinity is one of the most devastating environmental stresses for rice production in the coastal areas of Bangladesh. Improvement in salt tolerance of rice is an important way for the economic utilization of coastal zones. An experiment was conducted at the vinyl house of the Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Bangladesh during December 2016 to April 2017 to determine the effects of different salinity levels on the yield and yield components of some rice (Oryza sativa L.) genotype sand finally, screening of rice genotypes for salt tolerance. The experiment containing four treatments was laid out in a complete randomized design with five replications. The treatments were four levels of saline water with electrical conductivities at control (0.3 dSm-1), 5, 10 and 15dSm-1. Based on screening at germination stage, relatively salt-tolerant eleven genotypes with two check varieties were used in this experiment. The study showed that increase in salinity level significantly decreased yield and yield contributing characters of rice. However, among the eleven, three genotypes (Chapali, Patnai 23 and Soloi) were considered as moderately salt tolerant at 15 dSm-1 on the basis of their yields and yield contributing characteristics such as plant height reduction, total tiller reduction, effective tiller reduction, reduction of fertile grains per panicle, grain yield and relative grain yield. Therefore, Chapali, Patnai 23 and Soloi might be recommended as moderately salt tolerant rice genotypes. The Agriculturists 2018; 16(1) 65-77

scholarly journals Mapping QTLs for tolerance to salt stress at the early seedling stage in rice (Oryza sativa L.) using a newly identified donor ‘Madina Koyo’

Euphytica ◽  
2020 ◽  
Vol 216 (10) ◽  
Author(s):  
Nana Kofi Abaka Amoah ◽  
Richard Akromah ◽  
Alex Wireko Kena ◽  
Baboucarr Manneh ◽  
Ibnou Dieng ◽  
...  
Keyword(s):  
Salt Stress ◽  
Oryza Sativa L ◽  
Dry Weight ◽  
Interval Mapping ◽  
Snp Markers ◽  
Seedling Stage ◽  
Direct Selection ◽  
Chromosome 2 ◽  
Shoot Dry Weight ◽  
Early Seedling

Abstract Salt stress is a menace to rice production and a threat to food security worldwide. We evaluated 308 F4 families from Sahel 317/Madina Koyo for tolerance to salt stress at the early seedling stage. To better understand genomic regions controlling tolerance in the population, we genotyped the progenies and the two parents using single nucleotide polymorphism (SNP) markers and regressed the genotypic data on their phenotype to detect QTLs. An average reduction of 63.4% was observed for all fitness-related traits among the F4 families. A total of 46 progenies recorded an average salt injury score (SIS) between 1–3 and were rated as tolerant to salt stress at the early seedling stage. A high-density genetic map was constructed for the 12 rice chromosomes using 3698 SNP markers. Multiple interval mapping identified 13 QTLs for SIS, shoot length, shoot dry weight and root length on chromosomes 2, 3, 4, 6, 7, 10 and 12, with trait increasing alleles coming from both parents. Two (qSDW2 and qRL2.2) and three (qSL2, qRL2.1 and qSIS2) QTLs at different regions on chromosome 2 and another two on chromosome 7 (qSDW7 and qSL7) were tightly linked. These QTLs could facilitate breeding for salt tolerance at the early seedling stage as direct selection for one, would mean indirectly selecting for the other. Fine mapping of these novel QTLs in a different genetic background is necessary to confirm their stability and usefulness in breeding for tolerance to salinity in rice.

scholarly journals Mass screening for salinity tolerance in rice (Oryza sativa. L) genotypes at early seedling stage by hydroponics

2019 ◽  
Vol 10 (1) ◽  
pp. 137 ◽  
Author(s):  
M. Amaravel ◽  
S. Merina Prem Kumari ◽  
M. Arumugam Pillai ◽  
S. Saravanan ◽  
M. L. Mini ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Mass Screening ◽  
Salinity Tolerance ◽  
Oryza Sativa L ◽  
Seedling Stage ◽  
Early Seedling
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