Search results for "plant physiology"
showing 10 items of 118 documents
Mode of action of herbicidal derivatives of aminomethylenebisphosphonic acid. I. Physiologic activity and inhibition of anthocyanin biosynthesis
1996
N-Pyridylaminomethylenebisphosphonic acids constitute a class of promising herbicides. Since their mode of action at the cellular level is still poorly understood, we studied the influence of N-pyridylaminomethylenebisphosphonic acids on plant growth, at the whole plant and undifferentiated tissue levels, using seedlings and cell suspension cultures of mono- and dicotyledonous species. These compounds exhibited strong herbicidal properties, being equipotent with the popular herbicide glyphosate. Since they also depressed buckweed anthocyanin biosynthesis, the shikimate pathway could represent a site of action of N-pyridylaminomethylenebisphosphonic acids.
Fruit Regulates Bud Sprouting and Vegetative Growth in Field-Grown Loquat Trees (Eriobotrya japonica Lindl.): Nutritional and Hormonal Changes
2013
The effects of fruit on bud sprouting and vegetative growth were compared on fruiting and defruited loquat trees from fruit set onward. Carbohydrate and nitrogen content in leaves and bark tissues and hormone concentrations were studied during the fruit development and vegetative growth periods. On defruited trees, a significant proportion of buds sprouted in winter, whereas buds from fruiting trees sprouted only in the spring when fruit reached its final size. Furthermore, when panicles were completely removed in autumn, the buds also sprouted. In addition, fruit directly affected vegetative growth by reducing shoot length. An effect of sink removal ( flower or fruit) promoting bud sprouti…
Heavy metal-hormone interactions in rice plants: Effects on growth, net photosynthesis, and carbohydrate distribution
1995
The effect of external applications of gibberellins (GA3) and abscisic acid (ABA) on the growth, carbohydrate content, and net photosynthesis of heavy metal-stressed rice plants (Oryza sativa cv. Bahia) was investigated. Treatment with cadmium (0.1 mm) and nickel (0.5 mm) inhibited rice growth and stimulated carbohydrate accumulation, especially in seeds from which seedlings were developing, stems, and first leaves. The addition of GA3 (14 μm) to the rice culture solution together with Cd or Ni partially reversed the effects of heavy metals, stimulating growth as well as mobilization of carbohydrate reserves in seeds from which seedlings had developed. GA3 increased the sugar content in roo…
Anther and pollen grain culture of rice (Oryza sativa L.)
1981
Factors favouring callus proliferation and subsequent regeneration of plants from pollen grains of rice anthers (Oryza sativa L., cvx. Bahia, Girona, Balilla × Sollana and Sequial) were determined. Cultivar differences in response were found, such as a high rate of haploid plant regeneration.
Pedicularis sylvatica L. (19. Jahrhundert)
1847
3 meža jāņeglītes 19. gadsimta eksikāti. 1.attēls - legit Neuman; 2.attēls - legit Neuman, atradne "Germania"; 3.attēls - ievākts 1847. gadā. / 3 Wald-Läusekraut Herbarien aus dem 19. Jahrhundert. Bild 1 - legit Neuman; Bild 2 - legit Neuman, Hinterlegung "Germania"; Bild 3 - in Jahre 1847 gesammelt. / 3 19th century wood lousewort's herbariums. Picture 1 - legit Neuman; Picture 2 - legit Neuman, deposit "Germania"; Picture 3 - collected in 1847. [Attēli no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1371)]
Meža jāņeglītes pirmais atradums Latvijā
2021
Raksts veltīts Latvijā reti sastapta auga meža jāņeglītes Pedicularis sylvatica atradumiem Latvijas teritorījā, izceļot tās pirmo atradumu, ko 1923. gadā veica latviešu botāniķis Pauls Galenieks (1891 - 1962). Rakstā sniegta informācija par meža jāņeglītes herbārijiem Latvijas Universitātes muzejā.
Pedicularis sylvatica L. (P. Lackschewitz)
1928
Paula Lakševica 1928. gadā Rucavā ievāktie meža jāņeglītes exikāti. / Die Exikte des Wald-Läusekraut, die 1928 in Rucava Paul Lackschewitz gesammelt wurden. / Wood lousewort's Exicts, were collected in Rucava Paul Lackschewitz in 1928. [Attēli no LU Muzeja kolekcijas Herbarium Lackschewitzi (RIG III); (BOT12097)]
Pedicularis sylvatica L. (P. Galenieks)
1923
Meža jāņeglītes pirmais atradums Latvijā. Atradne Kurzemē, Rucavā starp Visminu un Zirnāju Vizuļu mājām gar kalnu, sausā vietā. / Wood lousewort's first find in Latvia. A deposit in Kurzeme, Rucava between Visminas and Zirnāji Vizuļi houses along the mountain, in a dry place. [Attēls no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1371)]
Pedicularis sylvatica L. (K.R. Kupffer)
1923
Meža jāņeglītes pirmais atradums Latvijā. Atradne Kurzemē, Rucavā starp Visminu un Zirnāju Vizuļu mājām sausā vietā pļavas malā. Aprakstījis un K. R. Kupferam nodevis Nikolajs Malta. / Wald-Läusekraut erster Fund in Lettland. Gefunden in Kurland, Rutzau, Wiese zwichen Wismini und Zirnaju Visuli an trockenen Stelle am Rand den Wiese. Beschrieben und an K. R. Kupfer von Nikolai Malta übergeben. / Wood Lousewort's first find in Latvia. A deposit in Kurzeme, Rucava between Vismini and Zirnāji Vizuļi houses in a dry place at the edge of the meadow. Described and handed over to K. R. Kupfer by Nikolai Malta. [Attēls no LU Muzeja kolekcijas Herbarium Balticum (RIG I); (BOT2767)]
Glyphosate residues alter the microbiota of a perennial weed with a minimal indirect impact on plant performance
2021
Abstract Purpose In cold climates, glyphosate residues may linger in soils, with effects on plant–microbe interactions and, consequently, plant performance. Here, we explore the influence of glyphosate residues on the endophytic microbiota (bacteria and fungi) and performance of the perennial nitrogen-fixing weed Lupinus polyphyllus. Methods In a common garden, we grew plants from six populations of L. polyphyllus in glyphosate-treated or untreated control soils, with or without additional phosphorus. We sampled plant microbiota (leaves, roots, nodules) and assessed plant performance based on six traits: height, retrogression probability (i.e. shrinkage), biomass, root:shoot ratio, nodule n…