نتایج جستجو برای: seed reserve

تعداد نتایج: 107653  

2002
Victoria L. Sork Frank W. Davis Rodney J. Dyer Peter E. Smouse

California valley oak is threatened by landscape alteration and failing recruitment in remnant stands. Its reproductive ecology is a key element of the seedling recruitment process. We first examine the mating system, to determine the extent of inbreeding in a population at Sedgwick Reserve, in Santa Barbara County. We then quantify variation in germination success and acorn size, evaluating th...

2009
Thierry Joët Andréina Laffargue Jordi Salmona Sylvie Doulbeau Frédéric Descroix Benoît Bertrand Alexandre de Kochko Stéphane Dussert

* The genomic era facilitates the understanding of how transcriptional networks are interconnected to program seed development and filling. However, to date, little information is available regarding dicot seeds with a transient perisperm and a persistent, copious endosperm. Coffea arabica is the subject of increasing genomic research and is a model for nonorthodox albuminous dicot seeds of tro...

Journal: :American journal of botany 2005
Amy E Zanne Colin A Chapman Kaoru Kitajima

Seed size and cotyledon morphology are two key juvenile traits that have evolved in response to changes in plant species life-history strategies and habitat associations. Correlations of these traits with each other and with other juvenile traits were examined for 70 species of trees and shrubs in Kibale National Park, Uganda. Although species with photosynthetic cotyledons were more abundant t...

Journal: :Plant physiology 2009
Richard Thompson Judith Burstin Karine Gallardo

Legume seeds are an important source of food and feed, and have been principally studied with a view to optimizing the composition of reserve substances starch, oligosaccharides, oil, and protein. The availability of genome and transcribed genome sequences for the legume model species Medicago truncatula and Lotus japonicus has stimulated the application of the -omics technologies to understand...

2017
Galina Smolikova Elena Dolgikh Maria Vikhnina Andrej Frolov Sergei Medvedev

The embryos of some angiosperms (usually referred to as chloroembryos) contain chlorophylls during the whole period of embryogenesis. Developing embryos have photochemically active chloroplasts and are able to produce assimilates, further converted in reserve biopolymers, whereas at the late steps of embryogenesis, seeds undergo dehydration, degradation of chlorophylls, transformation of chloro...

2012
WeiBo Ren Yunwei Zhang Bo Deng Huiqin Guo Libo Cheng Yaxue Liu

To explore the effect of space flight factors on the early development of alfalfa seedling, dry seeds were placed onboard a satellite for a 15-day flight. After retrieval, the ultra structure of seed coat and the chemical content of seed were tested, followed by tests for germinate ability, seedling growth, and mitotic and chromosome aberrations. Results showed that space flight factors have bo...

2008
Thomas Dietsch

Although agriculture is often listed as a major threat to tropical biodiversity conservation, researchers are starting to rethink this view by examining traditional forest gardens that have been adapted for modern crops like coffee and cacao. These unique farming systems incorporate habitat for birds and other biodiversity that may make them a useful addition to integrated conservation strategi...

Journal: :Plant physiology 2016
Zamira Abraham Raquel Iglesias-Fernández Manuel Martínez Ignacio Rubio-Somoza Isabel Díaz Pilar Carbonero Jesús Vicente-Carbajosa

The accumulation of storage compounds in the starchy endosperm of developing cereal seeds is highly regulated at the transcriptional level. These compounds, mainly starch and proteins, are hydrolyzed upon germination to allow seedling growth. The transcription factor HvGAMYB is a master activator both in the maturation phase of seed development and upon germination, acting in combination with o...

2016
Isabel Ruiz-Ballesta Guillermo Baena Jacinto Gandullo Liqun Wang Yi-Min She William Charles Plaxton Cristina Echevarría

Phosphoenolpyruvate carboxylase (PEPC; E.C. 4.1.1.31) was characterized in developing and germinating sorghum seeds, focusing on the transcript and polypeptide abundance of multiple plant-type phosphoenolpyruvate carboxylase (PTPC) genes, and the post-translational modification of each isoenzyme by phosphorylation versus monoubiquitination during germination. We observed high levels of SbPPC4 (...

Journal: :Plant physiology 1980
N R Gilkes M J Chrispeels

Homogenates of mung bean cotyledons were subjected to equilibrium density centrifugation on linear sucrose gradients and the positions of the various organelles determined by assay of marker enzymes. Measurement of phospholipid distribution on such gradients showed that the major peak of phospholipid at a density of 1.11 to 1.13 grams per cubic centimeter coincided with the position of the endo...

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