Seed Dormancy
Mostrando 25-36 de 177 artigos, teses e dissertações.
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25. Dormancy Breaking in Senna Pendula (Willd.) H. S. Irwin & Barneby
ABSTRACT Senna pendula seeds dormancy is caused by impermeability of the seed coat to water. In order to determine the best methodology to overcome dormancy and to perform a morphological characterization, two batches of seeds were submitted to the following treatments: a) mechanical scarification of the seed coat; b) immersion in hot water at 70 °C for 5,
Floresta Ambient.. Publicado em: 10/12/2018
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26. Abscisic acid and the antioxidant system are involved in germination of Butia capitata seeds
ABSTRACT Seed germination is an important step for plants without vegetative propagation and is a physiological process that begins with specific environmental cues resulting in biochemical responses. Breaking-dormancy is necessary to study germination in dormant seeds with asynchronous germination. We investigated the processes of breaking dormancy and germ
Acta Bot. Bras.. Publicado em: 21/09/2018
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27. Relationship between seed moisture content and acquisition of impermeability in Nelumbo nucifera (Nelumbonaceae)
ABSTRACT Seeds of Nelumbo nucifera do not imbibe water, and thus have physical dormancy (PY). However, a proportion of seeds are permeable to water, and so we hypothesized that variation in moisture content is a reason for the development of both permeable and impermeable seeds. The permeable proportion of seeds present in a lot collected from Suzhou, China,
Acta Bot. Bras.. Publicado em: 2017-12
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28. Genome-wide association study of pre-harvest sprouting resistance in Chinese wheat founder parents
Abstract Pre-harvest sprouting (PHS) is a major abiotic factor affecting grain weight and quality, and is caused by an early break in seed dormancy. Association mapping (AM) is used to detect correlations between phenotypes and genotypes based on linkage disequilibrium (LD) in wheat breeding programs. We evaluated seed dormancy in 80 Chinese wheat founder pa
Genet. Mol. Biol.. Publicado em: 10/07/2017
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29. Inter- and intra-population variability in physical dormancy along a precipitation gradient
ABSTRACT Physical dormancy enables plants that occur in temporally stochastic and harsh environments to survive; thus, within the distribution area of a species, the percentage of seeds with physical dormancy is expected to increase towards more arid and unpredictable areas. There have been no previous studies evaluating both inter and intra-population varia
Acta Bot. Bras.. Publicado em: 13/03/2017
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30. Enzyme activity and reserve mobilization during Macaw palm ( Acrocomia aculeata ) seed germination
ABSTRACT Reserve mobilization in seeds occurs after visible germination, which is marked by the protrusion of the radicle or cotyledonary petiole, as in species of Arecaceae. Acrocomia aculeata (macaw palm), usually produces hard seeds whose endosperm has mannan-rich cell walls. We investigated the composition of storage compounds in macaw palm seed and the
Acta Bot. Bras.. Publicado em: 22/08/2016
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31. To resist or to germinate? The effect of fire on legume seeds in Brazilian subtropical grasslands
Fire plays an important role in several grassland ecosystems in the world. Fire can trigger germination in several species, by breaking the physical dormancy of their seeds. Thus, we hypothesized that exposure to high temperatures during fire would break seed dormancy and enhance germination. We tested the effect of high temperatures on the germination of si
Acta Bot. Bras.. Publicado em: 2016-03
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32. Disturbance as a factor in breaking dormancy and enhancing invasiveness of African grasses in a Neotropical Savanna
The Cerrado is threatened by wildfires and invasive species. We aimed to evaluate in laboratory conditions whether temperature fluctuation at the soil surface, resulting from the absence of vegetation due to fire, can affect the germination of Urochloa decumbens and U. brizantha, two invasive African grasses. Seeds of both species were submitted to simulatio
Acta Bot. Bras.. Publicado em: 2016-03
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33. Overcoming dormancy and determining optimal temperature for slender serradella seed germination
ABSTRACT The objective of this study was to identify the most efficient method for overcoming coat-imposed dormancy and determine the optimal germination temperature for Ornithopus pinnatus seeds. Treatments to overcome dormancy were: intact seeds; immersion in hot water at 60 ºC, followed by soaking in the same water (unheated)/24 h; immersion in hot water
R. Bras. Zootec.. Publicado em: 2015-12
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34. Seed storage-mediated dormancy alleviation in Fabaceae from campo rupestre
ABSTRACTWe studied the effects of seed storage on germination and dormancy alleviation in three species of Fabaceae endemic to campo rupestrein southeastern Brazil. Fresh seeds of Collaea cipoensis, Mimosa maguirei and Mimosa foliolosawere set to germinate and germination of seeds after four, five and 13 years of storage was tested. Seed viability was mainta
Acta Bot. Bras.. Publicado em: 2015-09
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35. Effects of chemical treatments and environmental factors on seed dormancy and germination of shepherd's purse (Capsella bursa-pastoris (L.) Medic.)
Shepherd's purse (Capsella bursa-pastoris) is a problematic weed in citrus orchards and crop fields in northern Iran. In a series of laboratory and greenhouse experiments, we evaluated the effects that treatment with gibberellic acid (GA3) and potassium nitrate (KNO3), as well as environmental factors, including temperature, the duration of pre-chilling (wet
Acta Bot. Bras.. Publicado em: 2014-12
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36. Distribución vertical del banco de semillas de Euphorbia davidii Subils, en lotes agrícolas de la zona centro de la provincia de Buenos Aires, Argentina
Euphorbia davidii Subils a summer annual weed, that is present in the center of Buenos Aires province, Argentina. Field studies were conducted to determine the seed banks and the vertical distribution of this specie in agricultural lots, in Azul and Olavarría. Two hundred forty soil samples, from 60 randomly distributed points were extracted at four soil de
Planta daninha. Publicado em: 2014-12