机构地区: 仲恺农业工程学院园艺园林学院
出 处: 《北方园艺》 2013年第2期53-57,共5页
摘 要: 以广东地区主栽的25个切花菊品种为试材,采用LI-6400XT便携式光合测定系统,研究了其净光合速率、气孔导度、胞间CO2浓度、蒸腾速率等的光合日变化特性。结果表明:主要切花菊品种的光合日变化有2种模式,11个品种的净光合速率为单峰型,14个品种为双峰型。光合"午休"的双峰型主要是由非气孔因素限制造成的。"八月黄"等10个切花菊品种的净光合速率与气孔导度和蒸腾速率的日变化曲线存在高度的一致性,而与胞间CO2浓度呈负相关关系。季度净光合速率日均值随月份变化有所不同,其大小排序为:2009/09>2010/03>2009/12>2009/11>2010/01>2009/10;"十九少男"、"八月黄"、"百凤池"、"新台红"、"红美人"、"十八小姐"6个切花菊品种具有高光合能力。 Taking 25 cut chrysanthemum major cultivars from Guangdong as test materials, using potable LI-6400XT photosynthetic system, the net photosynthetic rate ( Pn), stomatal conductance (Gs), transpiration rate ( Tr ) and intracellular CO2 Concentration(Ci) of diurnal change characteristics of photosynthesis were studied. The results showed that the diurnaI changes of net photosynthetic rate (Pn) of 11 cultivars showed unimodal type while the other 14 cultivars bimodal type which indicated a midday depression phenomenon. The midday depression phenomenon was found to be caused by non-stomatal factors. The Pn of 10 cultivars ('Bayuehuang', et al. ) were highly consistent with stomatal conductance (Gs) and transpiration rate (Tr),while negatively related to intraceIlular COz concentration (Ci). The daily mean Pn values varied among different seasons,and their order were 2009/09〉2010/03〉2009/12〉2009/11〉2010/01〉 2009/10. Six cultivars ( ' Shijiushaonan ', ' Bayuehuang ', ' Baifenchi ', ' Xintaihong ', ' Hongrneiren ', ' Shibaxiaojie ') possessed high photosynthetic capacity.