نتایج جستجو برای: damaged seeds

تعداد نتایج: 74369  

Journal: :American journal of botany 2011
María C Rodríguez-Rodríguez Alfredo Valido

UNLABELLED PREMISE OF THE STUDY Pollination is a critical phase for plant reproduction, but ecological and evolutionary outcomes by pollinators may be counteracted by floral herbivores. These interacting assemblages may also be altered (directly or indirectly) by introduced species, especially on oceanic islands. In this study, we analyzed the effects of opportunistic nectar-feeding passerin...

2006
X. Zhan L. Li W. Cheng

The landscapes of Inner Mongolia are widely known for the vast Stipa krylovii steppes. However, overgrazing and other improper land uses have extensively degraded the Stipa krylovii steppe ecosystem in recent decades. Knowledge about the soil seed banks and the remaining vegetation in these damaged ecosystems is crucial for guiding the restoration efforts. Using a germination method, this study...

Journal: :Plant physiology 1982
M R Becwar P C Stanwood E E Roos

Changes in electrolyte leakage and viability in response to dehydration stress were examined in two species of seeds that do not survive desiccation. Leakage from silver maple (Acer saccharinum L.) seeds increased markedly as seed moisture contents decreased from 45 to 35% (fresh weight basis) and germination decreased from 97 to 5%, coincidentally. Time course curves of imbibitional leakage fr...

Journal: :iranian journal of neurology 0
davood sobhani-rad department of speech therapy, school of rehabilitation, tehran university of medical sciences, tehran, iran ; department of speech therapy, school of paramedical sciences, mashhad university of medical sciences, mashhad, iran. askar ghorbani department of neurology, school of medicine, tehran university of medical sciences, tehran, iran. hassan ashayeri department of rehabilitation, school of rehabilitation, iran university of medical sciences, tehran, iran. shohereh jalaei department of rehabilitation, school of rehabilitation, tehran university of medical sciences, tehran, iran. behrooz mahmoodi-bakhtiari department of performing arts, school of fine arts, tehran university, tehran, iran.

background: pragmatics is appropriate use of language across a variety of social contexts  that  provides accurate interpretation   of   intentions.   the   occurrence    of   the right hemisphere lesions can interfere with pragmatic abilities, and particularly with the processing of nonliteral speech acts. methods: since the objective of this study was to assess different  aspects of pragmatic...

Journal: :The Plant cell 2012
Justin Foster Hyun Uk Kim Paul A Nakata John Browse

Oxalate is produced by several catabolic pathways in plants. The best characterized pathway for subsequent oxalate degradation is via oxalate oxidase, but some species, such as Arabidopsis thaliana, have no oxalate oxidase activity. Previously, an alternative pathway was proposed in which oxalyl-CoA synthetase (EC 6.2.1.8) catalyzes the first step, but no gene encoding this function has been fo...

Journal: :The New phytologist 2017
Michael J Wise Warren G Abrahamson

Plant populations frequently maintain submaximal levels of resistance to natural enemies, even in the presence of substantial genetic variation for resistance. Identifying constraints on the evolution of increased resistance has been a major goal of researchers of plant-herbivore interactions. In a glasshouse study, we measured relative costs and benefits of resistance of tall goldenrod (Solida...

2008
Renate C. Smallegange Suzanne E. Blatt Jeff A. Harvey Marcel Dicke

Plants attacked by herbivorous insects emit volatile compounds that attract predators or parasitoids of the herbivores. Plant fitness increases when these herbivorous insects are parasitized by solitary parasitoids, but whether gregarious koinobiont parasitoids also confer a benefit to plant fitness has been disputed. We investigated the relationship between parasitoid load of the gregarious Co...

2014
Naoya Yamaguchi Hiroyuki Yamazaki Shizen Ohnishi Chika Suzuki Seiji Hagihara Tomoaki Miyoshi Mineo Senda

In Hokkaido, northern Japan, soybean [Glycine max (L.) Merr.] crops are damaged by cold weather. Chilling temperatures result in the appearance of cracking seeds (CS) in soybean crops, especially those grown in eastern and northern Hokkaido. Seed coats of CS are severely split on the dorsal side, and the cotyledons are exposed and frequently separated. CS occurrence causes unstable production b...

Journal: :Histology and histopathology 2005
J Bañuelos Pineda G Nolasco Rodríguez J A Monteon P M García López M A Ruiz Lopez J García Estrada

The effects of the intracerebroventricular (ICV) administration of crude extracts of lupin quinolizidine alkaloids (LQAs) were studied in adult rat brain tissue. Mature L. exaltatus and L. montanus seeds were collected in western Mexico, and the LQAs from these seeds were extracted and analyzed by capillary gas chromatography. This LQA extract was administered to the right lateral ventricle of ...

Journal: :Journal of nematology 1983
T H Olthof

Sugar beet (Beta vulgaris L. cv. Monogerm C.S.F. 1971) seeds sown into Vineland fine sandy loam, infested with 15,500 H. schachtii juveniles/pot, showed little growth during an 11-week test in the greenhouse. Seedlings transplanted at 2, 4, and 6 weeks of age had 32, 30, and 31% less top weight and 71, 68, and 59% less root weight, respectively, compared to controls grown in nematode-free soil....

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