With the aim to determine whether coronatine （COR） alleviates drought stress on wheat, two winter wheat （Triticum aestivum L.） cultivars, ChangWu134 （drought-tolerant） and Shan253 （drought-sensitive） were stud...With the aim to determine whether coronatine （COR） alleviates drought stress on wheat, two winter wheat （Triticum aestivum L.） cultivars, ChangWu134 （drought-tolerant） and Shan253 （drought-sensitive） were studied under hydroponic conditions. Seedlings at the three-leaf stage were eultured in a Hoagland solution containing COR at 0.1 ~M for 24 h, and then exposed to 20% polyethylene glycol 6000 （PEG- 6000）. Under simulated drought （SD）, COR increased the dry weight of shoots and roots of the two cultivars significantly; the root/shoot ratio also increased by 30% for Shan253 and 40% for ChangWu134. Both cultivars treated with COR under SD （0.1COR-I-PEG） maintained significantly higher relative water content, photosynthesis, transpiration, intercellular concentration of CO2 and stomatal conductance in leaves than those not treated with PEG. Under drought, COR significantly decreased the relative conductivity and malondialdehyde production, and the loss of 1,1-diphenyl-2-picrylhydrazyl scavenging activity in leaves was significantly alleviated in COR-treated plants. The activity of peroxidase, catalase, glutathione reductase and ascorbate peroxidase were adversely affected by drought. Leaves of plants treated with COR under drought produced less abscisic acid （ABA） than those not treated. Thus, COR might alleviate drought effects on wheat by reducing active oxygen species production, activating antioxidant enzymes and changing the ABA level.展开更多
In order to study the physiological and yield responses of sunflower inbred lines to full and limited irrigation, an experiment was conducted in the growing season of 2014–2015 in the research field of the Agricultur...In order to study the physiological and yield responses of sunflower inbred lines to full and limited irrigation, an experiment was conducted in the growing season of 2014–2015 in the research field of the Agricultural Research Station in Khoi, Iran. Water withholding was imposed in the flowering stages from R4 （initial flowering） to R6 （full flowering）. The results showed that the main effect of irrigation and inbred lines and the interaction effect between irrigation and inbred lines in terms of the proline and protein contents, the catalase, peroxidase, and polyphenol oxidase activities, and seed yield in all inbred lines, and relative water content（RWC） were significant at 1% level. Water withholding in the flowering stage increased the proline content and the catalase, peroxidase, and polyphenol oxidase activities, whereas limited irrigation decreased the protein content and seed yield in all inbred lines and RWC. The lowest protein content and the highest catalase, peroxidase, and polyphenol oxidase activities were observed in BGK 39 under limited irrigation condition, while BGK 37 revealed the highest proline content in such circumstances. The highest seed yield was seen in BGK 1 and BGK 375 in full irrigation condition. Limited irrigation increased the proline content by 49.51%, compared to that of full irrigation condition.展开更多
基金supported by grants from the National High Technology Research and Development Program of China(2006AA10A213)the Teaching and Research Award Program for Outstanding Young Teachers in Higher Educational Institutions of the Ministry of Education,China
文摘With the aim to determine whether coronatine （COR） alleviates drought stress on wheat, two winter wheat （Triticum aestivum L.） cultivars, ChangWu134 （drought-tolerant） and Shan253 （drought-sensitive） were studied under hydroponic conditions. Seedlings at the three-leaf stage were eultured in a Hoagland solution containing COR at 0.1 ~M for 24 h, and then exposed to 20% polyethylene glycol 6000 （PEG- 6000）. Under simulated drought （SD）, COR increased the dry weight of shoots and roots of the two cultivars significantly; the root/shoot ratio also increased by 30% for Shan253 and 40% for ChangWu134. Both cultivars treated with COR under SD （0.1COR-I-PEG） maintained significantly higher relative water content, photosynthesis, transpiration, intercellular concentration of CO2 and stomatal conductance in leaves than those not treated with PEG. Under drought, COR significantly decreased the relative conductivity and malondialdehyde production, and the loss of 1,1-diphenyl-2-picrylhydrazyl scavenging activity in leaves was significantly alleviated in COR-treated plants. The activity of peroxidase, catalase, glutathione reductase and ascorbate peroxidase were adversely affected by drought. Leaves of plants treated with COR under drought produced less abscisic acid （ABA） than those not treated. Thus, COR might alleviate drought effects on wheat by reducing active oxygen species production, activating antioxidant enzymes and changing the ABA level.
文摘In order to study the physiological and yield responses of sunflower inbred lines to full and limited irrigation, an experiment was conducted in the growing season of 2014–2015 in the research field of the Agricultural Research Station in Khoi, Iran. Water withholding was imposed in the flowering stages from R4 （initial flowering） to R6 （full flowering）. The results showed that the main effect of irrigation and inbred lines and the interaction effect between irrigation and inbred lines in terms of the proline and protein contents, the catalase, peroxidase, and polyphenol oxidase activities, and seed yield in all inbred lines, and relative water content（RWC） were significant at 1% level. Water withholding in the flowering stage increased the proline content and the catalase, peroxidase, and polyphenol oxidase activities, whereas limited irrigation decreased the protein content and seed yield in all inbred lines and RWC. The lowest protein content and the highest catalase, peroxidase, and polyphenol oxidase activities were observed in BGK 39 under limited irrigation condition, while BGK 37 revealed the highest proline content in such circumstances. The highest seed yield was seen in BGK 1 and BGK 375 in full irrigation condition. Limited irrigation increased the proline content by 49.51%, compared to that of full irrigation condition.
