The r6le of specific sexual hormones in the sexual reaction of two hetero-thallic species of Achlya has been described in earlier papers of this series.' Four specific substances were postulated, two secreted by the 9, bringing about specific reactions in the e, and two secreted by the c, inducing specific responses in the 9. On the basis of evidence available at that time it seemed that the en...

Reactive oxygen species (ROS) are highly reactive reduced oxygen molecules. Recent studies have shown that production of ROS occurs in response to many physiological stimuli in plant cells, including pathogen attack, hormone signaling, polar growth, and gravitropism. Evidence is emerging that ROS can function as cellular second messengers that are likely to modulate many different proteins lead...

The environmental toxin bisphenol A (BPA) is a known mammalian hormone disrupter but its effects on plants have not been well established. The effect of BPA on gene expression in Arabidopsis thaliana was determined using microarray analysis and quantitative gene PCR. Many hormone responsive genes showed changes in expression after BPA treatment. BPA disrupted flowering by a mechanism that may i...

The plant glutathione peroxidase (GPX) family consists of multiple isoenzymes with distinct subcellular locations, tissue-specific expression patterns and environmental stress responses. In this study, 13 putative GPXs from the genome of Gossypium hirsutum (GhGPXs) were identified and a conserved pattern among plant GPXs were exhibited, besides this they also responded to multiple environmental...

Phytohormones are not only essential for plant growth and development but also play central roles in triggering the plant immune signaling network. Historically, research aimed at elucidating the defense-associated role of hormones has tended to focus on the use of experimentally tractable dicot plants such as Arabidopsis thaliana. Emerging from these studies is a picture whereby complex crosst...

background: alpinia galanga (a. galanga) belongs to the zingiberaceae family has anti-oxidant effects in animals and humans body and often is used as medicament or part of medicaments in asian folk medicine for various applications. objective: the objective of this study was to investigate the molecular and biochemical influence of alcoholic extract from the rhizomes of a. galangal on the sperm...

background beta-thalassemia is the most common hematology disease in human and leptin is one of the hormone that produce by adiposities cells. the purpose of this study was to investigate the relationship between serum leptin level and thyroid hormones in children with major beta-thalassemia. materials and methods this descriptive-cross sectional study was performed on 90 children aged 6-16 yea...

The influence of sulphur (S) depletion on the expression of genes related to S metabolism, and on metabolite and plant hormone contents was analysed in young and mature leaves, fine roots, xylem sap, and phloem exudates of poplar (Populus tremula×Populus alba) with special focus on early consequences. S depletion was applied by a gradual decrease of sulphate availability. The observed changes w...

Bioactive hormone concentrations are regulated both at the level of hormone synthesis and through controlled inactivation. Based on the ubiquitous presence of 2beta-hydroxylated gibberellins (GAs), a major inactivating pathway for the plant hormone GA seems to be via GA 2-oxidation. In this study, we used various approaches to determine the role of C(19)-GA 2-oxidation in regulating GA concentr...