甘蔗高光效新品种筛选与光合潜力分析OA北大核心CSTPCD

Screening new sugarcane varieties with high light efficiency could guarantee the high-quality development and sugar safety.Chlorophyll fluorescence parameters were measured and calculated from Lake-model for 3 commercial varieties and 10 new varieties to investigate the sugarcane photosynthetic potential under cloudy and sunny day through the mechanism model of photosynthetic electron flux(J)response to light.The results showed that light energy balanced between photosynthetic election transport and regulated energy dissipation(ΦNPQ)under low and high light,the ap-pearance of increased non-regulated energy dissipation(ΦNO)under middle light resulted from the different transition mode among each sugarcane varieties according to increasing photo active radiation(PAR)other than photo-damage.Compared with in sunny day,the initial light utilization rate(αe)of all sugarcane varieties was significantly higher in cloudy day,but J showed sharp decrease at the same PAR level.RG16117 and RG 1997 exhibited the highest photo-quantum efficiency(ΦII)in cloudy and sunny day respectively,which showed no significantly difference between RG16239 and RG1997 under high light.ΦII of RG16239 was lower than ROC22 and RG1997 under low and middle light with the lowest ΦNO,but the saturate PAR and maximum J were relatively high under high light.The photosyn-thetic electron transport capacity index(JPT)based on the weight ratio of cloudy and sunny days in recent 5 years ex-posed as RG1997(21.93)>ROC22(21.43)>ROC16(20.62)>RG16239(20.27)>GL05136(19.43)>RG11713(19.30)>RG1462(19.29)>RG14291(19.03)>RG16117(18.94)>RG1339(18.93)>RG1876(18.08)>RG1(17.41)>RG11559(16.84),which made RG1997 and RG16239 high light efficiency varieties.