Zeatin

About: Zeatin is a research topic. Over the lifetime, 2467 publications have been published within this topic receiving 64092 citations. The topic is also known as: Zeatin & (E/Z)-zeatin.

Endogenous plant growth regulators and rooting capacity of different walnut tissues

Abstract: Rooting ability of three different materials, namely cotyledonar linking areas, cotyledonary portions and embryonic microshoots from walnut seeds was determined. It was shown that while cotyledonar linking areas may be defined as a espontaneous rooting system, the other two tissue types correspond to inducible rooting systems, needing exogenous application of auxins for root induction. Endogenous zeatin and isopentenyl type cytokinins, indole-3-acetic acid (IAA), and abscisic acid (ABA) contents were determined in the three kinds of plant material prior to their culture. Our results show that the most active rooting systems has high levels of cytokinins, particularly dihydrozeatin (diH)Z and its riboside, and low levels of IAA and ABA. This situation could indicate that oxidative metabolism was taking place in cotyledonar linking areas, which is generally associated with the initiation phase of the rooting process. So that, we can assume that the induction phase is already overpassed in these tissues. On the contrary, the other two systems in which high levels of auxins and reduced levels of cytokinins were found, need to undergo the induction phase to be able to show root manifestation. In this case, the exogenous auxins are responsible for triggering this process, by enhancement of oxidative conditions. Therefore, it can be conclude that dynamics of growth regulators levels during the different phases of rooting are more important than specific single levels at fixed time.

In vitro propagation of Oxydendrum arboreum from mature trees

Abstract: The greatest number of shoots >10 mm was produced with 4 μM zeatin, whereas BA and 2iP were ineffective at the same concentrations. Addition of IAA (5 and 10 μM) to the medium reduced the number of shoots. Thidiazuron (0.0045-0.045 μM) produced a few short shoots. In vitro rooting of the proliferated shoots was enhanced with 2.5 to 10 μM of IBA in the culture medium

Plant regeneration in Actinidia polygama Miq. by leaf, stem, and petiole culture with zeatin, and from stem-derived calli on low-sucrose medium

Abstract: We examined the effect of zeatin on the formation of shoot buds from explants and callus tissues derived from stem segments of Actinidia polygama Miq. (matatabi or silver vine). Stem and petiole segments cultured on combined broad-leaved tree medium and woody plant medium (BW medium) supplemented with zeatin for 40 days formed many shoot buds. Callus tissues derived from the stem segments and subcultured on BW medium supplemented with 6-benzyladenine and 1-naphthaleneacetic acid formed shoot buds when the medium contained 13.7μM zeatin. BW medium containing low concentrations of sucrose strongly induced the formation of shoot buds from the callus.