Connection between the developmental stage and the quantity and quality of essential oil was investigated in some model species of the Asteraceae, Lamiaceae and Apiaceae plant families. The accumulation of essential oil decreased continuously during ontogenesis in Tanacetum vulgare. The tendency of accumulation showed an optimum curve in Mentha piperita, Hyssopus officinalis, Majorana hortensis...

Plants interact with their environment and they often flower earlier under stress conditions, but how such stress-induced flowering is regulated remains poorly understood. Here evidence is presented that the miR169 family plays a key role in stress-induced flowering in plants. The microRNA (miRNA) miR169 family members are up-regulated in Arabidopsis, maize, and soybean under abiotic stresses. ...

deficit of oil seeds and high volume of oil imports in iran, and limitation of water sources against production of many oil seed crops, demonstrate the importance of detection tolerant species and cultivars for stressful conditions and their most sensitive growth stages to saline stress. in order to study response of spring safflowers (carthamus tinctorius l.) genotypes to disruption irrigation...

The flowering time regulator GIGANTEA (GI) connects networks involved in developmental stage transitions and environmental stress responses in Arabidopsis. However, little is known about the role of GI in growth, development and responses to environmental challenges in the perennial plant poplar. Here, we identified and functionally characterized three GI-like genes (PagGIa, PagGIb and PagGIc) ...

Flowering potted plants during the postproduction stage are usually stored in inadequate environmental conditions. We evaluated the effect of the most common storage conditions and treatments on two Bougainvillea cultivars after harvest and during recovery. Flowering potted Bougainvillea plants were treated with 100 mL 2 mM amino-oxyacetic acid (AOA) or 500 ppb 1-methylcyclopropene (1-MCP) prio...

this study was conducted to determine the chemical composition, degradability characteristics gas production as well as the phenomenon of the persian clover (trifolium resopinatum) when at some growth stages of the were early budding to full flowering, namely: early budding (i), full budding (ii), early flowering (iii) as well as full flowering stage (iv). four fistulated mehraban male sheep we...

drought, as an abiotic stress inflicts destructive and harmful effects on plants at their different growth stages. plants react differently to drought. among their reactions is the production of such osmolytes as proline and glycine betaine. it seems that, through exogenous application of these materials, plant resistance to drought stress can be increased. therefore, a factorial experiment, ba...

Frost damage to the flowers and early developing fruits is one of the most limiting factors in the most almond cultivation regions of the world. This study was undertaken to help understand almond response to frost spring at same phenological stage, in order to develop criteria for the selection of cultivars with improved resistance to frost on the basis of field and laboratory experiments. In ...

in order to evaluate and drought tolerance selection in cowpea genotypes and to identify the best indices for drought tolerance, an experiment was conducted at research field university of tehran in karaj during 2011-2012 growing season. in this study, 31 cowpea genotypes were evaluated in a randomized complete block design (rcbd) with three replications under normal irrigation (non- stress) an...

Sorghum [Sorghum bicolor (L.) Moench] yield formation is severely affected by high temperature stress during reproductive stages. This study pursues to (i) identify the growth stage(s) most sensitive to high temperature stress during reproductive development, (ii) determine threshold temperature and duration of high temperature stress that decreases floret fertility and individual grain weight,...