scholarly journals Genetic Regulation of Seed Dormancy in Purshia tridentata(Rosaceae)

2000 ◽  
Vol 85 (4) ◽  
pp. 521-529 ◽  
Author(s):  
S Meyer
Keyword(s):  
Seed Dormancy ◽  
Genetic Regulation ◽  
Purshia Tridentata

scholarly journals HSI2/VAL1 and HSL1/VAL2 function redundantly to regulate seed dormancy by controlling DOG1 expression in Arabidopsis

2019 ◽  
Author(s):  
Naichong Chen ◽  
Hui Wang ◽  
Haggag Abdelmageed ◽  
Vijaykumar Veerappan ◽  
Million Tadege ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Seed Dormancy ◽  
Critical Role ◽  
Genetic Regulation ◽  
Proximal Promoter ◽  
Multicopy Suppressor ◽  
Dna Binding Domains ◽  
Binding Domains ◽  
High Level

ABSTRACTDELAY OF GERMINATION1 (DOG1) represents a major quantitative locus for the genetic regulation of seed dormancy in Arabidopsis. Accumulation of DOG1 in seeds leads to deep dormancy and delayed germination. Here, we report that the conserved B3 DNA binding domains of the transcriptional repressors HIGH-LEVEL EXPRESSION OF SUGAR INDICIBLE GENE2/ VIVIPAROUS-1/ABSCISIC ACID INSENSITIVE 3-LIKE1 (HSI2/VAL1) and HSI2-LIKE1/ VIVIPAROUS-1/ABSCISIC ACID INSENSITIVE 3-LIKE2 (HSL1/VAL2), which play critical roles in the developmental transition from seed maturation to seedling growth, interact with RY elements in the DOG1 proximal promoter leading to repression of DOG1 transcription during germination and seedling establishment. DOG1 expression is partially de-repressed in hsi2/val1 (hsi2-2) but not in hsl1/val2 (hsl1-1) knockout mutants and is strongly upregulated in a hsi2/val1 hsl1/val2 double mutant, indicating that HSI2/VAL1 and HSL1/VAL2 act redundantly to repress DOG1 expression. HSI2/VAL1 and HSL1/VAL2 form homo- and hetero-dimers in vivo, and dimerization is dependent on the HSI2/VAL1 PHD-like domain. Complementation of hsi2-2 with HSI2/VAL1 harboring a disrupted plant homeodomain (PHD)-like domain results in stronger de-repression of DOG1 expression than the hsi2-2 knockout, indicating that the PHD-like domain plays a critical role in mediating functional interactions between HSI2/VAL1 and HSL1/VAL2. Both HSI2/VAL1 and HSL1/VAL2 interact with components of polycomb repressive complex 2 (PRC2), including CURLY LEAF and MULTICOPY SUPPRESSOR OF IRA1 (MSI1), along with LIKE HETERCHROMATIN PROTEIN 1 (LHP1), which are involved in the deposition and expansion of histone H3 lysine 27 trimethylation (H3K27me3) marks in repressive chromatin. Thus, HSI2/VAL1 HSL1/VAL2-dependent recruitment of PRC2 leads to silencing of DOG1 through the deposition of H3K27me3.

Breaking Seed Dormancy in Corchorus olitorius Landraces

Planta Medica ◽  
2008 ◽  
Vol 74 (03) ◽  
Author(s):  
AE-D Helaly ◽  
H Al-Amier ◽  
AA Al-Aziz ◽  
LE Craker
Keyword(s):  
Seed Dormancy ◽  
Corchorus Olitorius ◽  
Breaking Seed Dormancy

Phenotypic dissection of bone mineral density facilitates the identification of skeletal site specificity on the genetic regulation of bone

2013 ◽  
Author(s):  
P Kemp John ◽  
Medina-Gomez Carolina ◽  
Estrada Karol ◽  
H M Heppe Denise ◽  
M Zillikens Carola ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Genetic Regulation ◽  
Site Specificity ◽  
Mineral Density ◽  
Skeletal Site

Principal component-derived bone density phenotypes and genetic regulation of the pediatric skeleton

2017 ◽  
Author(s):  
Jonathan Mitchell ◽  
Alessandra Chesi ◽  
Shana McCormack ◽  
Diana Cousminer ◽  
Heidi Kalkwarf ◽  
...  
Keyword(s):  
Bone Density ◽  
Genetic Regulation ◽  
Principal Component

Aflatoxins biosynthesis, toxicity and intervention strategies: A review

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Developing Countries ◽  
Molecular Basis ◽  
Genetic Regulation ◽  
Intervention Strategies ◽  
Historical Background ◽  
Economic Losses ◽  
Factors Affecting ◽  
Biomarkers Of Exposure ◽  
Food Commodities

Aflatoxins (AFTs) are toxic products of fungal metabolism, associated with serious health consequences and substantial economic losses to agriculture, livestock and poultry sectors, particularly in the developing countries. This review outlines the current information on AFTs in terms of historical background, classification, relative occurrence and co-existence with other mycotoxins in various food commodities. The phenomenon of aflatoxin (AFT) biosynthesis has been elucidated with reference to molecular basis, genetic regulation and factors affecting the AFT production. Moreover, the in vivo disposition kinetics, toxicological action and toxico-pathological consequences of AFTs have also been highlighted. Currently employed strategies for the detection and detoxification of AFTs, biomarkers of exposure assessment, potential economic impact and regulatory considerations regarding the AFTs have been emphasized.

Multi-environment evaluation of Spanish bunch groundnut genotypes for fresh seed dormancy

2019 ◽  
Vol 79 (3) ◽  
Author(s):  
Narendra Kumar ◽  
B. C. Ajay ◽  
A. L. Rathnakumar ◽  
T. . Radhakrishnan ◽  
M. C. Dagla1 ◽  
...  
Keyword(s):  
Seed Dormancy ◽  
Stability Index ◽  
Pooled Analysis ◽  
Genetic Stock ◽  
Breeding Lines ◽  
Fresh Seed ◽  
Differential Behavior ◽  
Environmental Interactions ◽  
Crop Maturity

The present study was carried out to evaluate eight promising Spanish bunch groundnut genotypes during four consecutive year (2014, 2015, 2016, 2017) to study genotype × environmental interactions and to identify stable sources of fresh seed dormancy in Spanish background in groundnut. Pooled analysis of variance revealed highly significant differences among the genotypes and genotype × environmental interactions for fresh seed dormancy at weekly intervals indicating that differential behavior of genotypes for fresh seed dormancy over the environmental conditions. Based on the results of intensity and duration of dormancy and germination stability index, identified four stable advanced breeding lines viz., PBS 12192, PBS 12187, PBS 12191 and PBS 12190 having high fresh seed dormancy of three week and two stable advanced breeding lines viz., PBS 12189 and PBS 12171 having high fresh seed dormancy of two week. Therefore, these genotypes can be used as novel genetic stock of fresh seed dormancy in Spanish bunch and they can be integrated into breeding programs to develop high yielding Spanish bunch cultivars with 2-3 weeks of fresh seed dormancy to avoid yield losses due to in-situ germination at the time of crop maturity.

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