【摘要】 以玉米农大108为试验材料,在温室和盆栽条件下,研究叶面喷施叔胺类活物质DCPTA和DTA-6对玉米苗期叶片光合特性、光合关键酶以及叶绿素荧光特性的调控机制。结果表明,DCPTA和DTA-6处理显著提高了玉米株高和生物量;显著提高了玉米叶片光合速率、蒸腾速率、气孔导度和叶绿素含量,降低了细胞间隙CO2浓度,但不改变叶绿素a/b值;显著提高了PEPC羧化酶和RuBP羧化酶活性;显著提高了玉米叶片PSⅡ最大光化学效率(Fv/Fm)、PSⅡ有效电子产量(ΦPSⅡ)和光化学淬灭(qP),降低了非光化学淬灭系数qN;DCPTA和DTA-6处理的适宜浓度分别为50和20 mg/L。更多还原

【Abstract】 The effect of tertiary amine bioregulator(DCPTA and DTA-6)on photosynthesis,photosynthetic key enzyme and chlorophyll fluorescence parameters of corn(cv.Nongda 108)leaves,was studied in pots under greenhouse.DCPTA and DTA-6 were sprayed on leaves at seedling about four explanted leaves,and with water spraying as control.The results indicated the height and biomass were significantly increased by DCPTA and DTA-6.The photosynthetic rate,transpiration rate,stomatal conductance and chlorophyll content were increased,and the intercellular CO2 concentration was decreased,the chlorophyll a/b was indifference by DCPTA and DTA-6.The activities PEPCase and RuBPcase,maximal photochemical efficiency of PSⅡ(Fv/Fm),effective quantum yield of PSⅡ(ΦPSⅡ),photochemical quenching coefficient(qP)were significantly promoted by DCPTA and DTA-6,but nonphotochemical quenching coefficient was declined.The treatment was best at the DCPTA with 50 mg/L and DTA-6 with 20 mg/L.更多还原