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13 резултата
Seed after-ripening and over-expression of class I beta-1,3-glucanase confer maternal effects on tobacco testa rupture and dormancy release.
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'Coat-imposed' seed dormancy of many non-endospermic and endospermic species is released during after-ripening. After-ripening-mediated promotion of tobacco ( Nicotiana tabacum L.) seed germination is mainly due to a promotion of testa rupture and a similar promotion of subsequent endosperm rupture.
beta-1,3-Glucanase gene expression in low-hydrated seeds as a mechanism for dormancy release during tobacco after-ripening.
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An air-dry developmental state with low-hydrated tissues is a characteristic of most plant seeds. Seed dormancy is an intrinsic block of germination and can be released during after-ripening, that is air-dry storage of mature seeds. Both seed-covering layers, testa and endosperm, cause the
Preparation and fusion properties of protoplasts from mature pollen of Nicotiana tabacum.
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A method to remove the exine from mature tobacco pollen and to release numerous intact pollen protoplasts has been developed. Post-anthesis binucleate pollen was treated with water, buffered with MES at pH 5.5, for two hours. Rupture of the exine was caused by the force of pollen hydration exposing
Class I [beta]-1,3-Glucanases in the Endosperm of Tobacco during Germination.
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Rupture of the seed coat and rupture of the endosperm are separate events in the germination of Nicotiana tabacum L. cv Havana 425 seeds. Treatment with 10-5 M abscisic acid (ABA) did not appreciably affect seed-coat rupture but greatly delayed subsequent endosperm rupture by more than 100 h and
In vivo monitoring of nicotine biosynthesis in tobacco leaves by low-temperature plasma mass spectrometry.
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Low-temperature plasma (LTP) is capable of ionizing a broad range of organic molecules at ambient conditions. The coupling of LTP to a mass analyzer delivers chemical profiles from delicate objects. To investigate the suitability of LTP ionization for mass spectrometry (MS) based in vivo studies, we
Brassinosteroids and gibberellins promote tobacco seed germination by distinct pathways.
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Seed germination of Nicotiana tabacum L. cv. Havana 425 is determined by the balance of forces between the growth potential of the embryo and the mechanical restraint of the micropylar endosperm. In contrast to the gibberellin GA4, the brassinosteroid (BR) brassinolide (BL) did not release
Retarded germination of Nicotiana tabacum seeds following insertion of exogenous DNA mimics the seed persistent behavior.
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Tobacco seeds show a coat-imposed dormancy in which the seed envelope tissues (testa and endosperm) impose a physical constraint on the radicle protrusion. The germination-limiting process is represented by the endosperm rupture which is induced by cell-wall weakening. Transgenic tobacco seeds,
AN ELECTRON MICROSCOPE STUDY OF TOBACCO MOSAIC VIRUS LESIONS IN NICOTIANA GLUTINOSA L.
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Ultra-thin sections of Nicotiana glutinosa L. leaves inoculated with a concentrated solution of tobacco mosaic virus were made at short intervals from 0 to 78 hours after inoculation. Eight hours after inoculation, the size of starch grains increased. This was followed by rupture of cytoplasmic and
Plant disease and the regulation of enzymes involved in lignification : Effects of osmotic pressure on phenylpropanoid enzymes and on the hypersensitive response of tobacco to tobacco mosaic virus.
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Tobacco varieties carrying the N gene from Nicotiana glutinosa respond to infection by Tobacco Mosaic Virus (TMV) by forming necrotic local lesions (hypersensitive reaction), thereby localizing the infection. In this study, infected mesophyll leaf tissue of N. tabacum Samsun NN was treated with the
Ethylene-responsive element binding protein (EREBP) expression and the transcriptional regulation of class I beta-1,3-glucanase during tobacco seed germination.
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Class I beta-1,3-glucanase (betaGLU I) is transcriptionally induced in the micropylar endosperm just before its rupture prior to the germination (i.e. radicle emergence) of Nicotiana tabacum L. cv. 'Havana 425' seeds. Ethylene is involved in endosperm rupture and high-level betaGLU I expression;
Water uptake and distribution in germinating tobacco seeds investigated in vivo by nuclear magnetic resonance imaging.
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The regulation of water uptake of germinating tobacco (Nicotiana tabacum) seeds was studied spatially and temporally by in vivo (1)H-nuclear magnetic resonance (NMR) microimaging and (1)H-magic angle spinning NMR spectroscopy. These nondestructive state-of-the-art methods showed that water
[beta]-1,3-Glucanase Is Cryoprotective in Vitro and Is Accumulated in Leaves during Cold Acclimation.
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We have used isolated spinach (Spinacea oleracea L.) thylakoid membranes to investigate the possible cryoprotective properties of class I [beta]-1,3-glucanase (1,3-[beta]-D-glucan 3-glucanohydrolase; EC 3.2.1.39) and chitinase. Class I [beta]-1,3-glucanase that was purified from tobacco (Nicotiana
Simplification of vacuole structure during plant cell death triggered by culture filtrates of Erwinia carotovora.
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Vacuoles are suggested to play crucial roles in plant defense-related cell death. During programmed cell death, previous live cell imaging studies have observed vacuoles to become simpler in structure and have implicated this simplification as a prelude to the vacuole's rupture and consequent lysis
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