Drought Tolerant Mutant Induction Via Gamma Rays in Bread Wheat

2013 ◽  
Vol 17 (3) ◽  
pp. 129-156 ◽  
Author(s):  
A. M. M. Al-Naggar ◽  
M. M. M. Atta ◽  
S. E. S. Sobieh ◽  
Kh . F . Al-Azab
Keyword(s):  
Bread Wheat ◽  
Gamma Rays ◽  
Drought Tolerant ◽  
Mutant Induction ◽  
Tolerant Mutant

scholarly journals Characterization of EST‑SSR markers in bread wheat EST related to drought tolerance and functional analysis of SSR‑containing unigenes

2020 ◽  
pp. 1-12
Author(s):  
Laila Dabab Nahas ◽  
Alsamman M. Alsamman ◽  
Aladdin Hamwieh ◽  
Naim Al-Husein ◽  
Ghinwa Lababidi
Keyword(s):  
Drought Tolerance ◽  
Bread Wheat ◽  
Ssr Markers ◽  
Web Sites ◽  
Wheat Breeding ◽  
Genic Ssr ◽  
Drought Tolerant ◽  
Ssr Loci ◽  
Weather Changes

Bread wheat (Triticum aestivum) is an important staple food around the world. The enormous volume of the genome of wheat makes it quite slow to progress in traditional scientific research. On the other hand, incessant databases and suitable tools on web sites make progress in wheat research quicker and easier. Drought is a major abiotic stress in accordance with weather changes and accelerated increase in drylands. In this study, 9077 ESTs related to drought tolerance in hexaploid wheat were downloaded from NCBI and assembled into 12062 contigs and 4141 singletons. It was found that trinucleotide had the highest frequency 64.71%. Moreover, 53.80% of SSRs found in coding regions in respect of ORFs. The highest amino acids found for tri-and hexanucleotides were Arginine. In addition, 81% of SSR-containing unigenes had one chromosome location and the highest number of loci was found in chromosomes 1B (69). The distribution of genic SSR loci among the 21 wheat chromosomes, the three subgenomes, and the seven homoeologous groups of wheat chromosomes was significant, with P<0.01 indicating a non-random distribution. Functional annotation and characterization of SSR-containing unigenes have been performed. Eighty-six sequences were identified and sorted into 25 putative TF families and establish 166 pathways using KEGG. Primer-BLAST was used to predict the polymorphism, which was 39% of the 63 primer pairs of SSR markers. Our current study attempts to help farmers in wheat breeding programs to have drought-tolerant accessions, particularly in developing countries

scholarly journals Identification of Drought Tolerant Mutant Lines of TEF [ERAGROSTIS TEF (ZUCC.) TROTTER]

Afrika Focus ◽  
2019 ◽  
Vol 32 (2) ◽  
Author(s):  
Regula Blösch ◽  
Abiel Rindisbacher ◽  
Sonia Plaza-Wüthrich ◽  
Nora Röckel ◽  
Annett Weichert ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Eragrostis Tef ◽  
Food Crop ◽  
Methane Sulfonate ◽  
Terminal Drought ◽  
Drought Tolerant ◽  
Late Developmental Stage ◽  
Tolerant Mutant ◽  
Mutant Lines ◽  
Orphan Crop

Introduction: Tef [Eragrostis tef (Zucc.) Trotter] is the major food crop in Ethiopia where it is annually cultivated on about 30% of the total area allocated to cereals. The productivity of tef is, however, significantly reduced by drought which can occur at either the early or the late developmental stage of the crop. Methodology: A total of 10,000 EMS (ethyl methane sulfonate) mutagenized M2 tef populations were screened first for early and second for terminal drought tolerance. The performance of candidate lines was investigated using diverse agronomical and physiological parameters. Results and discussion: Several promising lines were obtained for both early and terminal drought tolerance. Among these, genotypes with outstanding performance were found for two drought tolerant tef lines targeting early drought tolerance (dtt2 and dtt13) and three terminal drought tolerant lines targeting terminal drought tolerance (tdt9, tdt15 and tdt19). Conclusions: Candidate lines for both early and terminal drought tolerance will play vital roles in deve- loping drought tolerance in tef improvement. KEY WORDS: DROUGHT TOLERANCE, ERAGROSTIS TEF, ORPHAN CROP, MOISTURE SCARCITY, TEF

scholarly journals Potential of morpho-physiological traits for identification of drought tolerant bread wheat (Triticum aestivum L.) genotypes under moisture stress and irrigated environment

2021 ◽  
Vol 12 (3) ◽  
Author(s):  
Patel Jashvantlal Manilal ◽  
Shashikant Kacharabhai Patel ◽  
Chirag Rameshbhai Patel ◽  
Amrutbhai Shankerlal Patel ◽  
Karen P. Pachchigar
Keyword(s):  
Triticum Aestivum ◽  
Bread Wheat ◽  
Moisture Stress ◽  
Triticum Aestivum L ◽  
Physiological Traits ◽  
Drought Tolerant

scholarly journals Meiotic Chromosome Behaviours in M1 Generation of Bread Wheat irradiated by Gamma-rays

1982 ◽  
Vol 32 (4) ◽  
pp. 365-370
Author(s):  
Yoshio WATANABE ◽  
Shigeru TAKATO
Keyword(s):  
Bread Wheat ◽  
Gamma Rays ◽  
Meiotic Chromosome

Use of Gamma Rays and Hybridization to Create New Drought Tolerant Wheat Genotypes

2015 ◽  
Vol 5 (5) ◽  
pp. 282-299
Author(s):  
A. Al-Naggar ◽  
Kh. Al-Azab ◽  
S. Sobieh ◽  
M. Atta
Keyword(s):  
Gamma Rays ◽  
Wheat Genotypes ◽  
Drought Tolerant

scholarly journals Multivariate Analysis of Morpho-Physiological Traits Reveals Differential Drought Tolerance Potential of Bread Wheat Genotypes at the Seedling Stage

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 879
Author(s):  
Mohammed Mohi-Ud-Din ◽  
Md. Alamgir Hossain ◽  
Md. Motiar Rohman ◽  
Md. Nesar Uddin ◽  
Md. Sabibul Haque ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Drought Tolerance ◽  
Water Content ◽  
Total Variation ◽  
Bread Wheat ◽  
Weight Ratio ◽  
Principal Component ◽  
Physiological Traits ◽  
Wheat Genotypes ◽  
Drought Tolerant

Drought is one of the foremost environmental stresses that can severely limit crop growth and productivity by disrupting various physiological processes. In this study, the drought tolerance potential of 127 diverse bread wheat genotypes was evaluated by imposing polyethylene glycol (PEG)-induced drought followed by multivariate analysis of several growth-related attributes. Results showed significant variations in the mean values of different morpho-physiological traits due to PEG-induced drought effects. Correlation analysis revealed that most of the studied traits were significantly correlated among them. The robust hierarchical co-clustering indicated that all the genotypes were clustered into four major groups, with cluster 4 (26 genotypes) being, in general, drought-tolerant followed by cluster 1 (19 genotypes) whereas, cluster 2 (55 genotypes) and 3 (27 genotypes) being drought-sensitive. Linear discriminant analysis (LDA) confirmed that around 90% of the genotypes were correctly assigned to clusters. Squared distance (D2) analysis indicated that the clusters differed significantly from each other. Principal component analysis (PCA) and genotype by trait biplot analysis showed that the first three components accounted for 71.6% of the total variation, with principal component (PC) 1 accounting for 35.4%, PC2 for 24.6% and PC3 for 11.6% of the total variation. Both PCA and LDA revealed that dry weights, tissue water content, cell membrane stability, leaf relative water content, root-shoot weight ratio and seedling vigor index played the most important discriminatory roles in explaining drought tolerance variations among 127 wheat genotypes. Our results conclude that the drought-tolerant and -sensitive wheat genotypes identified in this study would offer valuable genetic tools for further improvement of wheat productivity in arid and semi-arid regions during this time of unpredictable climate change.

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