scholarly journals Copepod Embryonic Dormancy: “An Egg Is Not Just an Egg”

2019 ◽  
Vol 237 (2) ◽  
pp. 145-169 ◽  
Author(s):  
Benni Winding Hansen
Keyword(s):  
Embryonic Dormancy

scholarly journals Embryonic dormancy in seeds of Bactris gasipaes Kunth (peach-palm)

2017 ◽  
Vol 39 (2) ◽  
pp. 106-113 ◽  
Author(s):  
Patricia Nazário ◽  
Sidney Alberto do Nascimento Ferreira ◽  
Eduardo Euclydes de Lima Borges
Keyword(s):  
Latin America ◽  
The Other ◽  
Economic Interest ◽  
Bactris Gasipaes ◽  
Embryo Germination ◽  
Sand Mixture ◽  
Half Strength ◽  
Whole Seed ◽  
Amazonas State ◽  
Embryonic Dormancy

Abstract: Bactris gasipaes is a domesticated palm whose fruits are of great importance for the Amazonian people and whose heart of palm is also receiving economic interest in other brazilian and Latin America regions. The aim of this study was verify embryonic dormancy and its correlation with first cataphyll emergence in B. gasipaes seeds collected from four plants at Manaus city and four others at Coari city, both in the Amazonas state, Brazil. After extraction and cleaning, some of the seeds (4 replications of 25 per plant) were sown in a seedbed with a sawdust and sand mixture as substrate, and embryos (4 replications of 10 per plant), after extraction, were inoculated into half strength Murashige and Skoog cultures. Were used 100 seeds and 40 embryo per treatment. Whole seed and embryo germination varied between the different source plants and locations, with the greatest difference observed for the emergence of first cataphyll from seeds in the seedbed. For the most part of variables, results of seed and embryo were positively associated, namely, as one went up the other also, and vice versa. These results suggesting that, at least in part, seed dormancy in Bactris gasipaes is associated with embryonic dormancy.

Population dynamics and seasonal variation in the embryonic dormancy ofPilophorus gallicus(Hemiptera: Miridae): ‘don't put all your eggs in one basket'

2017 ◽  
Vol 20 (2) ◽  
pp. 191-200 ◽  
Author(s):  
Maria José Ramírez-Soria ◽  
Elena López-Gallego ◽  
Michelangelo La-Spina ◽  
Juan A. Sanchez
Keyword(s):  
Population Dynamics ◽  
Seasonal Variation ◽  
Embryonic Dormancy

RESPECTIVE EFFECTS OF ENDOCARP, TESTA AND ENDOSPERM, AND EMBRYO ON THE GERMINATION OF RASPBERRY (Rubus idaeus L.) SEEDS

1985 ◽  
Vol 65 (1) ◽  
pp. 125-130 ◽  
Author(s):  
XAVIER NESME
Keyword(s):  
Seed Coat ◽  
Rubus Idaeus ◽  
Immature Embryos ◽  
Varietal Differences ◽  
Seed Coats ◽  
Embryonic Dormancy ◽  
Germinated Seeds

Scarification or seed coat removal was carried out on seeds of five varieties of raspberry, Rubus idaeus L. Regardless of the variety, 100% germination was reached in less than 15 days, at 20 °C, with naked embryos or if the three seed coats were nicked. Intact nutlets never germinated. Seeds with nicked endocarps did not germinate until the testa and the endosperm were injured. Therefore, germination appeared physically prevented by the testa and/or the endosperm while, except for immature embryos, there was no embryonic dormancy. In addition there were varietal differences in the germination of the seeds at high or low temperatures.Key words: Rosaceae, Rubus idaeus L., germination, seeds

Dry-Season Embryonic Dormancy inDeois flavopicta(Homoptera: Cercopidae): Roles of Temperature and Moisture in Nature

2000 ◽  
Vol 29 (4) ◽  
pp. 714-720 ◽  
Author(s):  
Carmen S. S. Pires ◽  
Edison R. Sujii ◽  
Eliana M. G. Fontes ◽  
Catherine A. Tauber ◽  
Maurice J. Tauber
Keyword(s):  
Dry Season ◽  
Embryonic Dormancy

Afterripening Requirements and Optimal Germination Temperatures for Nuttall's Alkaligrass (Puccinellia nuttalliana) and Weeping Alkaligrass (Puccinellia distans)

Weed Science ◽  
2007 ◽  
Vol 55 (1) ◽  
pp. 36-40 ◽  
Author(s):  
Catherine S. Tarasoff ◽  
Daniel A. Ball ◽  
Carol A. Mallory-Smith
Keyword(s):  
Incubation Temperature ◽  
Perennial Grass ◽  
Kentucky Bluegrass ◽  
Grass Species ◽  
Puccinellia Distans ◽  
Dry Storage ◽  
Seed Harvest ◽  
High Level ◽  
Moisture Conditions ◽  
Embryonic Dormancy

In the Grande Ronde Valley of eastern Oregon, two perennial grass species in the genusPuccinellia, weeping alkaligrass and Nuttall's alkaligrass, are weeds of Kentucky bluegrass grass-seed production fields. Weeping alkaligrass is introduced from Eurasia, whereas Nuttall's alkaligrass is native to the region. These two species were studied to determine dormancy attributes and optimal temperature conditions for seed germination. Results from the current studies indicate that both species have a high level of embryonic dormancy immediately following seed harvest, which is primarily eliminated through dry storage (afterripening) and an incubation temperature of 20 C. Following adequate afterripening, a prechill treatment of 5 d at 5 C had an inconsistent effect on germination of weeping alkaligrass (P = 0.012 in 2002, 0.156 in 2003) and improved germination of Nuttall's alkaligrass over both years (P < 0.0001). The afterripening requirement for weeping alkaligrass was more than 90 d, whereas Nuttall's alkaligrass required more than 180 d. Following adequate afterripening, both species had rapid and well-synchronized germination at fluctuating day/night temperatures of 30/10 C given unlimited moisture conditions. Given these results, it is unlikely that seeds of either species would germinate in eastern Oregon during the summer months. The data predict a long viability period under dry storage for both species. Weeping alkaligrass and Nuttall's alkaligrass should exhibit a rapid, well-synchronized germination in the spring as observed in the field.

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