摘要
[Objective] To investigate the effects of rooting agents on the growth and photosynthetic traits of Sudan grasses. [ Method] The responses of the growth and some photosynthetic traits of Sudan grasses to three NK II rooting agents were determined according to the randomized complete block design. [ Result] Compared to control treatment, the Sudan grass treated by NK 11-298 showed higher chlorophyll a and carotenoid contents, higher chlorophyll fluorescence parameter values （ PSII quantum efficiency： ФPSII; photochemical quenching： qP; and electron transport rate： ETR）, higher maximum photosynthetic rate （Pmax） and respiration rate （ Rd）, and the highest biomass accumulation. The chlorophyU fluorescence parameter values of Sudan grasses treated by NK 11-888 and NK 11-16 were higher than those of control treatment （ P 〈 0.05）, and other indexes had no significant difference. [ Conclusion] The rooting agents should be selected carefully according to their practice aims because of sensibility of Sudan grass to rooting agents.
[Objective] To investigate the effects of rooting agents on the growth and photosynthetic traits of Sudan grasses. [ Method] The responses of the growth and some photosynthetic traits of Sudan grasses to three NK II rooting agents were determined according to the randomized complete block design. [ Result] Compared to control treatment, the Sudan grass treated by NK 11-298 showed higher chlorophyll a and carotenoid contents, higher chlorophyll fluorescence parameter values （ PSII quantum efficiency： ФPSII; photochemical quenching： qP; and electron transport rate： ETR）, higher maximum photosynthetic rate （Pmax） and respiration rate （ Rd）, and the highest biomass accumulation. The chlorophyU fluorescence parameter values of Sudan grasses treated by NK 11-888 and NK 11-16 were higher than those of control treatment （ P 〈 0.05）, and other indexes had no significant difference. [ Conclusion] The rooting agents should be selected carefully according to their practice aims because of sensibility of Sudan grass to rooting agents.
基金
supported by the Science Research Development Fund of Tianjin Agricultural University(2008D004)
the National Natural Science Foundation(30900191)
