scholarly journals NYEs/SGRs-mediated chlorophyll degradation is critical for detoxification during seed maturation in Arabidopsis

2017 ◽  
Vol 92 (4) ◽  
pp. 650-661 ◽  
Author(s):  
Zhongpeng Li ◽  
Shouxin Wu ◽  
Junyi Chen ◽  
Xiaoyan Wang ◽  
Jiong Gao ◽  
...  
Keyword(s):  
Seed Maturation ◽  
Chlorophyll Degradation

scholarly journals Brassinosteroids repress the seed maturation program during the seed-to-seedling transition

2021 ◽  
Author(s):  
Jiuxiao Ruan ◽  
Huhui Chen ◽  
Tao Zhu ◽  
Yaoguang Yu ◽  
Yawen Lei ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Transcription Factor ◽  
Abscisic Acid ◽  
Plant Hormone ◽  
Flowering Plants ◽  
Seed Maturation ◽  
Domain Protein ◽  
Abscisic Acid Insensitive3 ◽  
Underlying Mechanisms ◽  
Embryonic Structure

Abstract In flowering plants, repression of the seed maturation program is essential for the transition from the seed to the vegetative phase, but the underlying mechanisms remain poorly understood. The B3-domain protein VIVIPAROUS1/ABSCISIC ACID-INSENSITIVE3-LIKE 1 (VAL1) is involved in repressing the seed maturation program. Here we uncovered a molecular network triggered by the plant hormone brassinosteroid (BR) that inhibits the seed maturation program during the seed-to-seedling transition in Arabidopsis (Arabidopsis thaliana). val1-2 mutant seedlings treated with a BR biosynthesis inhibitor form embryonic structures, whereas BR signaling gain-of-function mutations rescue the embryonic structure trait. Furthermore, the BR-activated transcription factors BRI1-EMS-SUPPRESSOR 1 and BRASSINAZOLE-RESISTANT 1 bind directly to the promoter of AGAMOUS-LIKE15 (AGL15), which encodes a transcription factor involved in activating the seed maturation program, and suppress its expression. Genetic analysis indicated that BR signaling is epistatic to AGL15 and represses the seed maturation program by downregulating AGL15. Finally, we showed that the BR-mediated pathway functions synergistically with the VAL1/2-mediated pathway to ensure the full repression of the seed maturation program. Together, our work uncovered a mechanism underlying the suppression of the seed maturation program, shedding light on how BR promotes seedling growth.

scholarly journals LEAFY COTYLEDON1 expression in the endosperm enables embryo maturation in Arabidopsis

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jingpu Song ◽  
Xin Xie ◽  
Chen Chen ◽  
Jie Shu ◽  
Raj K. Thapa ◽  
...  
Keyword(s):  
Seed Development ◽  
Embryo Development ◽  
Growth Regulators ◽  
Seed Maturation ◽  
Embryo Maturation ◽  
Leafy Cotyledon1 ◽  
Functional Relevance ◽  
Necessary And Sufficient ◽  
Zygote Stage

AbstractThe endosperm provides nutrients and growth regulators to the embryo during seed development. LEAFY COTYLEDON1 (LEC1) has long been known to be essential for embryo maturation. LEC1 is expressed in both the embryo and the endosperm; however, the functional relevance of the endosperm-expressed LEC1 for seed development is unclear. Here, we provide genetic and transgenic evidence demonstrating that endosperm-expressed LEC1 is necessary and sufficient for embryo maturation. We show that endosperm-synthesized LEC1 is capable of orchestrating full seed maturation in the absence of embryo-expressed LEC1. Inversely, without LEC1 expression in the endosperm, embryo development arrests even in the presence of functional LEC1 alleles in the embryo. We further reveal that LEC1 expression in the endosperm begins at the zygote stage and the LEC1 protein is then trafficked to the embryo to activate processes of seed maturation. Our findings thus establish a key role for endosperm in regulating embryo development.

Dormancy studies in seed of Avena fatua. 10. On the inheritance of germination behaviour

1979 ◽  
Vol 57 (15) ◽  
pp. 1663-1667 ◽  
Author(s):  
S. Jana ◽  
S. N. Acharya ◽  
J. M. Naylor
Keyword(s):  
Seed Dormancy ◽  
Avena Fatua ◽  
Seed Maturation ◽  
Germination Behaviour ◽  
Parental Lines ◽  
Pure Lines

Breeding experiments were performed with pure lines of Avena fatua differing characteristically in duration of primary seed dormancy. The results indicate that the parental lines differ for at least three genes controlling rate of afterripening. It is evident that at least two of these genes influence the rate of afterripening at different periods after seed maturation.

scholarly journals Effect of Oxidative Stress on Physicochemical Quality of Taiwanese Seagrape (Caulerpa lentillifera) with the Application of Alternating Current Electric Field (ACEF) during Post-Harvest Storage

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1011
Author(s):  
Andi Syahrullah Sulaimana ◽  
Chao-Kai Chang ◽  
Chih-Yao Hou ◽  
Bara Yudhistira ◽  
Fuangfah Punthi ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Electric Field ◽  
Alternating Current ◽  
Chlorophyll Degradation ◽  
Physicochemical Quality ◽  
Post Harvest ◽  
Caulerpa Lentillifera ◽  
Different Seasons ◽  
Current Electric Field

This study aims to determine the physicochemical quality of seagrape (Caulerpa lentillifera) as a freshness label for products cultivated in different seasons. The applied post-harvest storage experiments compared between, within and without seawater that led to oxidative stress conditions. Water content, malondialdehyde (MDA) compound, total phenolic content (TPC), and chlorophyll content were observed at 0, 3, 6, and 9 days of storage. The storage without seawater showed sharper quality reductions by reaching 20–40% of water loss, 70–90% of MDA production, 15–25% of TPC reduction, and 40–60% of total chlorophyll degradation. The storage within seawater showed lower quality reductions due to the specific growth rates still reaching 5–10%. This study found that the greater the physicochemical quality, the slower the decomposition rates of the stored seagrape during storage. Therefore, the seagrapes’ obvious discoloration occurred earlier in winter, followed by summer and spring. Kinetics of chlorophyll degradation on seagrape in different seasons meet different order-reactions during storage. Furthermore, alternating current electric field (ACEF) treatment with 125 kV/m of intensity for 60 min can lower the spring seagrapes’ physicochemical quality by reaching 10–30% of inhibition, resulting in the shelf-life extension for up to 12 days of post-harvest storage.

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