Abstract. In order to evaluate the allelopathic potential of an exotic invasive weed, Parthenium hysterophorus L., the effect of different concentrations of aqueous extracts (5%, 25%, 50%, 75% and 100%) prepared from leaves of P. hysterophorus were studied on the seed germination and seedling shoot growth of two common native herbs, Plantago asiatica L. and Youngia japonica (L.) DC., through laboratory bioassays. The aqueous leaf extracts at the concentrations of 25%, 75 % and 100 % significantly inhibited the seed germination and seedling shoot growth of two target species. There was complete failure of seed germination of Y. japonica in 75 % and 100 % aqueous leaf extracts. The inhibitory effect increased with increasing extract concentration. These results suggested that allelopathy may play a role in the impact of P. hysterophorus invasion on native plant recruitment of invaded communities in southern China.

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Germination

Michael Fenner, Ken Thompson · Cambridge University Press eBooks · 2005

Germination involves the imbibition of water, a rapid increase in respiratory activity, the mobilization of nutrient reserves and the initiation of growth in the embryo. It is an irreversible process; once germination has started the embryo is committed irrevocably to growth or death. Externally, germination is marked by the bursting of the testa and the extrusion of the plumule or radicle. In this chapter, we examine the influence that various environmental factors have on the process.

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Germination

M. Nonogaki, H. Nonogaki · Encyclopedia of Applied Plant Sciences · 2016

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Germination

Miriam Allott · 2023

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Germination

John L. Willis, Michael B. Walters, Kurt W. Gottschallk et al. · 2015

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GERMINATION

Manjul Dutt, Manjul Dutt, Dr. Robert et al. · 2004

A sequential imaging system using a flat bed scanner interfaced to a personal computer was developed to study seed germination and vigor. The utility of the system was demonstrated in studies relating aspects of seed vigor in impatiens seed lots and for dormancy release in two woody perennials. Impatiens seed lots were kept in storage for 6 months to obtain a range in vigor levels. The ability to see differences at the individual seed level was possible because of the development of the sequential imaging system. It was observed that seeds deteriorated both under optimum 4 O C as well as 25 O C storage conditions. It was determined that both germination rate and seedling growth rate were appropriate measures of seed vigor. As untreated and primed seed lots were aged, germination percentage was negatively correlated with germination rate and positively correlated with seedling growth. However, there was a lack of correlation between germination rate and seedling growth on an individual seed basis. The data suggests that germination rate and seedling growth rate appear to be measuring different aspects of vigor. Sequential imagery also showed subtle changes in seed and seedling growth as seeds came out of dormancy that would not be detectable otherwise. This technique revealed changes in seed morphology that were previously not documented for seeds with physical dormancy. The current study furthered the utility of the imaging system by the development of sequential imaging that allows for samples to be collected hourly without technician input. This permitted very accurate determinations of germination rate and seedling growth on a single seed basis.

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Germination

Ulf Vierke · transcript Verlag eBooks · 2011

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Germination

Ivany Ferraz, Marques Válio, Fabiano Micheletto Scarpa · 2000

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germination

University of Arizona Press eBooks · 2024

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Germination

Howard Hotson · Oxford University Press eBooks · 2020

Decades ago, Walter Ong intuited a powerful link between the advent of printing with moveable type, the subsequent spatialization of discourse most strikingly evident in Ramism, and the corpuscular, mechanistic physics of Descartes (section 3.i). More recently, Klaas van Berkel has identified the precise location of this link in Snellius’ student, Isaac Beeckman (1588–1637), who, working at the interface of artisanal knowledge and Ramist pedagogy, developed the basic principles of a physico-mathematical philosophy of nature which he passed on to Descartes in 1618–19 and to Gassendi and Mersenne a decade later (section 3.ii). Another figure of the same generation, Henricus Reneri (1593–1639), was inspired by a very similar set of interests and aspirations to become Descartes’ first devoted follower and perhaps closest friend (section 3.iii).

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Comparison of conidial germination and germination rate.

Helong Chen (652531), Caiping Hu (652532), Kexian Yi (652533) et al. · Figshare · 2015

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