An analysis of variations in morphological characteristics, essential oil content, and genetic sequencing among and within major Iranian Juniper (Juniperus spp.) populations.

Junipers (Juniperus spp.) are important pharmaceutical plants, and they are commonly grown in the northern hemisphere because of the various medicinal properties attributed to the Juniperus genus. However, despite their pharmaceutical and also industrial importance, and despite plant diversity being a common topic of research among professional breeding programs, there is a relatively small body of work which focuses on diversity in juniper, and this is especially true of juniper species that are native to Iran.

The Transcriptional Regulator BBX19 Promotes Hypocotyl Growth by Facilitating COP1-Mediated EARLY FLOWERING3 Degradation in Arabidopsis.

Hypocotyl elongation is a highly coordinated physiological response regulated by myriad internal and external cues. Here, we show that BBX19, a transcriptional regulator with two B-box motifs, is a positive regulator of growth; diminished BBX19 expression by RNA interference reduces hypocotyl length, and its constitutive expression promotes growth. This function of BBX19 is dependent on the E3 ubiquitin ligase CONSTITUTIVE PHOTOMORPHOGENIC1 (COP1), EARLY FLOWERING3 (ELF3), and PHYTOCHROME-INTERACTING FACTOR4 (PIF4) and PIF5.

BBX19 interacts with CONSTANS to repress FLOWERING LOCUS T transcription, defining a flowering time checkpoint in Arabidopsis.

The timely transition of vegetative to reproductive development is coordinated through quantitative regulation of floral pathway genes in response to physiological and environmental cues. Here, we show that the circadian-controlled expression of the Arabidopsis thaliana floral transition regulators FLOWERING LOCUS T (FT) and CONSTANS (CO) is antiphasic to that of BBX19, a transcription factor with two B-Box motifs. Diminished expression of BBX19 by RNA interference accelerates flowering, and constitutive expression of BBX19 delays flowering under inductive photoperiods.

Seismomorphogenesis: a novel approach to acclimatization of tissue culture regenerated plants.

Plantlets under in vitro conditions transferred to ex vivo conditions are exposed to biotic and abiotic stresses. Furthermore, in vitro regenerated plants are typically frail and sometimes difficult to handle subsequently increasing their risk to damage and disease; hence acclimatization of these plantlets is the most important step in tissue culture techniques. An experiment was conducted under in vitro conditions to study the effects of shaking duration (twice daily at 6:00 a.

Micropropagation of Araucaria excelsa R. Br. var. glauca Carrière from orthotropic stem explants.

The objectives of the present work were in vitro propagation of Araucaria excelsa R. Br. var.

RAPD fingerprint to appraise the genetic fidelity of in vitro propagated Araucaria excelsa R. Br. var. glauca plantlets.

Randomly amplified polymorphic DNA (RAPD) was used as a tool to assess the genetic fidelity of in vitro propagated Araucaria excelsa R. Br. var.