硒对水分胁迫下葡萄幼苗光合特性的影响

以酿酒葡萄赤霞珠扦插盆栽苗为试材,研究硒对水分胁迫下葡萄幼苗光合特性的影响,以期为硒在葡萄抗旱栽培方面的应用提供参考依据.结果表明:随水分胁迫时间的延长,葡萄光合作用逐渐下降.水分胁迫条件下,葡萄叶面喷施一定浓度(0.5～1.5 mg/L)的亚硒酸钠均能提高叶绿素含量,但以0.5 mg/L的亚硒酸钠溶液处理效果最好,可以缓解水分胁迫对葡萄光合作用的影响；当葡萄叶面喷施低浓度(0.5 mg/L)的亚硒酸钠时,能缓解净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)及重度水分胁迫以前胞间CO2浓度(Ci)的下降,同时还能促进重度水分胁迫以后胞间CO2浓度(Ci)的升高；当喷施高浓度(1.0～1.5 mg/L)的亚硒酸钠时,会促进这些光合相关指标的降低.

Effect of Selenium on Photosynthetic Properities of Vitis viniferal L.cv. Cabernet Sauvignon Under Water Stress

The cutting seedings of Vitis viniferal L.cv.Cabernet Sauvignon was used as material,the effect of selenium(Se)on photosynthetic properities of Vitis viniferal L.cv.Cabernet Sauvignon under water stress were studied,in order to provide reference for drought tolerance cultivation of grape.The results showed that with the time of water stress prolonged,the photosynthetic ability was decreased slowly.Under water stress,the treatments with different concentration of sodium selenite solution(0.5~1.5 mg/L) could improve the grape chlorophyll content,but the treatment effect with 0.5 mg/L sodium selenite solution was the best,it could alleviate the negative effect of water stress stress on photosynthe sis.When grape leaves were spayed with low concentration of sodium selenite solution(0.5 mg/L),it could alleviate the depression of Pn,Gs and Tr during the whole stress period and alleviate the depression of Ci before the serious water stress time,and it could also make the Ci improved after serious stress time.When grape leaves were spayed with high concentration of sodium selenite solution(1.0~1.5 mg/L),it could promote these indexes about photosynthesis decreased.