CAJ | 학술논문

选用4个耐荫性有差异的大豆品种为材料,通过与单作比较,研究了套作遮荫时不同大豆品种幼苗叶片光合及叶绿素荧光特性的差异.结果表明,套作遮荫提高了大豆叶片叶绿素含量、总叶绿素与类胡萝卜素比值(Chl(a+b)/Car)、胞间二氧化碳浓度(Ci)、水分利用效率(WUE)、叶片初始荧光(Fo)、PSⅡ有效光化学量子产量(Fv′/Fm′)和实际光化学效率(ΦPSⅡ);使叶绿素a与叶绿素b比值(Chla/b)、类胡萝卜素(Car)含量、净光合速率(Pn)、气孔导度(Gs)、气孔限制值(Ls)、蒸腾速率(Tr)、PSⅡ最大光化学量子产量(Fv/Fm)、光化学荧光猝灭系数(qP)、非光化学荧光猝灭(NPQ)呈减小趋势.套作遮荫降低了大豆地上部分干物质积累量,其干物质积累量与Pn呈极显著正相关.耐荫性相对较好的材料,如贡选1号和南豆12在套作遮荫下Pn下降较少,且有着相对较高的Chlb、Car分子组成比例、Fo和Fv/Fm.
선용4개내음성유차이적대두품충위재료,통과여단작비교,연구료투작차음시불동대두품충유묘협편광합급협록소형광특성적차이.결과표명,투작차음제고료대두협편협록소함량、총협록소여류호라복소비치(Chl(a+b)/Car)、포간이양화탄농도(Ci)、수분이용효솔(WUE)、협편초시형광(Fo)、PSⅡ유효광화학양자산량(Fv′/Fm′)화실제광화학효솔(ΦPSⅡ);사협록소a여협록소b비치(Chla/b)、류호라복소(Car)함량、정광합속솔(Pn)、기공도도(Gs)、기공한제치(Ls)、증등속솔(Tr)、PSⅡ최대광화학양자산량(Fv/Fm)、광화학형광졸멸계수(qP)、비광화학형광졸멸(NPQ)정감소추세.투작차음강저료대두지상부분간물질적루량,기간물질적루량여Pn정겁현저정상관.내음성상대교호적재료,여공선1호화남두12재투작차음하Pn하강교소,차유착상대교고적Chlb、Car분자조성비례、Fo화Fv/Fm.
The effects of shading on photosynthetic and fluorescent characteristics of soybean seedlings were studied under maize-soybean relay cropping and monoculture.The results showed that under relay cropping condition,there were increases of chlorophyll content,total-chlorophyll/carotenoids[Chl(a+b)/Car] ratios,ratio of intercellular to ambient CO_2, water-use efficiency, minimal fluorescence (Fo), photochemical efficiency of PSⅡin the light (Fv′/Fm′) and the actual photochemical efficiency of PSⅡ in the light (ΦPSⅡ), although there were decrease of Chla/b ratios, carotenoids,net photosynthesis rate (Pn),stomata conductance (Gs), stomata limitation (Ls),transpiration rate (Tr),maximal photochemical efficiency of PSⅡ in the dark (Fv/Fm), photosynthetic active fluorescence quenching (qP) and nonphochemical fluorescence quenching (NPQ). Poor light led to lower weight of dry matter accumulation in maize-soybean relay cropping.The dry matter accumulation was highly significantly correlated to Pn. In shading tolerance soybean cultivars such as Gongxuan 1 and Nandou 12,there were less Pn decreasing,more Chlb,Car and Fo, and higher Fv/Fm.