The influence of abscisic acid on the ethylene biosynthesis pathway in the functioning of the flower abscission zone in Lupinus luteus.

Flower abscission is a highly regulated developmental process activated in response to exogenous (e.g. changing environmental conditions) and endogenous stimuli (e.

Molecular cloning of the BLADE-ON-PETIOLE gene and expression analyses during nodule development in Lupinus luteus.

The BLADE-ON-PETIOLE (BOP) genes have been recently shown to play an essential role in many physiological processes, including embryogenesis, meristem determinacy, leaf patterning and nodule development. In our research we used Lupinus luteus, a plant with great agronomic potential due to its high protein content and nitrogen fixation ability. In this work, LlBOP in L.

The involvement of InMIR167 in the regulation of expression of its target gene InARF8, and their participation in the vegetative and generative development of Ipomoea nil plants.

The plant hormone auxin plays a critical role in regulating plant growth and development. Recent advances have been made that having improved our understanding of auxin response pathways, primarily by characterizing the genes encoding auxin response factors (ARFs) in Arabidopsis. In addition, the expression of some ARFs is regulated by microRNAs (miRNAs).

[Abscisic acid metabolism].

Abscisic acid is one of the plant hormones that determines normal growth and development, i.e. seeds ripening and germination, stomata opening and closure, flowering and stress responses.

[Jasmonate biosynthesis--the latest discoveries].

Jasmonates are plant hormones involved in many growth and development processes. They also participate in plant defense responses. Current progress in the study on biosynthesis and signaling of jasmonates has contributed to the understanding of the mechanisms regulating concentration of these hormones in the cell.

[Jasmonate signaling pathway--new insight].

Significant progress which was made during last few years in research of jasmonic acid signaling pathway yielded surprising information about chemical form of a signaling molecule of the hormone, which turned out to be its conjugate with amino acid isoleucine. Function of jasmonic acid receptor is more and more frequently attributed to COI1 protein which is structurally and functionally similar to the auxin receptor TIR1. Signal perception takes place in the nucleus and leads to the activation of SCF(COI1) ubiquitine ligase and consequently to proteolysis of transcription repressors, the JAZ proteins.

[Ethylene signal transduction pathway].

Ethylene is involved in the regulation of many growth and developmental processes in plants. Signaling pathways of the hormone are activated by five receptors, which are localized in membranes of endoplasmic reticulum and are similar to bacterial two-component histidine kinases. In the air, ethylene receptors activate CTR1 protein, which is a negative regulator (repressor) of nuclear protein--EIN2.

Light- and IAA-regulated ACC synthase gene (PnACS) from Pharbitis nil and its possible role in IAA-mediated flower inhibition.

The light- and indole-3-acetic acid (IAA)-regulated 1-aminocyclopropane-1-carboxylic acid (ACC) synthase gene (PnACS) from Pharbitis nil was isolated. Here, it was shown that the gene was expressed in cotyledons, petioles, hypocotyls, root and shoot apexes both in light- and dark-grown seedlings. The highest expression level of PnACS was found in the roots.

[Regulation of ethylene biosynthesis in plants].

Ethylene is one of the plant hormones that controls growth and development. There are many responses regulated via ethylene in response to exogenous stimuli. Research on ethylene biosynthesis and the signalling pathway enabled us to understand the mechanism of the regulation of these responses.