GA3和Spd对杜鹃开花期光合特性和抗氧化系统的影响  

Effects of GA3 and Spd on Photosynthetic Characteristics and Antioxidant System during Florescence in Rhododendron simsii

作　　者：徐倩[1] 李华雄 黄文沛 鲜小林[3] 李青[4] 赵胤 陈睿[3] 潘远智[1] XU Qian;LI Hua-xiong;HUANG Wen-pei;XIAN Xiao-lin;LI Qing;ZHAO Yin;CHEN Rui;PAN Yuan-zhi(College of Landscape Architecture,Sichuan Agricultural University, Chengdu 611130, China;Neijiang Academy qf Agricultural Sciences/Key Laboratory of Biology, Neijiang 641000, Sichuan, China;Horticulture Institute, Sichuan Academy of Agricultural Sciences/Key Laboratory of Biology, Chengdu 610066, China;Tibet Academy of Agriculture and Animal Husbandry Sciences, Lhasa 850000, China)

机构地区：[1]四川农业大学风景园林学院,成都611130 [2]四川省内江市农业科学院,四川内江641000 [3]四川省农业科学院园艺研究所,成都610066 [4]西藏自治区农牧科学院,拉萨850000

出　　处：《热带亚热带植物学报》2019年第4期439-445,共7页Journal of Tropical and Subtropical Botany

基　　金：内江市自然科学基金项目(2015KFN06);成都市自然科学基金项目(2015-NY02-00023-NC)资助~~

摘　　要：为探讨GA3和Spd对杜鹃(Rhododendron simsii)开花花期和开花品质的影响,研究了外源GA3和Spd对杜鹃开花期光合特性和抗氧化系统的变化。结果表明,外源GA3对花期有显著的提前作用,Spd对花期有明显的延迟作用,但两者均使花期延长、花径增大且成花率提高。GA3和Spd处理提高了花期叶片的光合色素含量和净光合速率(Pn)、气孔导度(Gs)和胞间CO2浓度(Ci);GA3处理提高了叶片的蒸腾速率(Tr),而Spd使叶片的Tr下降,两者均有效缓解了末花期叶绿素含量的下降。GA3和Spd处理显著降低了花瓣MDA含量,提高了抗氧化酶SOD、POD和CAT活性,并减缓了末花期SOD的下降,有效延缓了衰老进程,延长花期。以1 600 mg L–1 GA3和0.10 mmol L-1 Spd处理效果较好,能有效提高杜鹃花的观赏品质。In order to understand the effects of exogenous GA3 and Spd on florescence and flowering quality of Rhododendron simsii,the changes in photosynthetic characters and antioxidant system during the flowering period were studied.The results showed that GA3 had a significant ahead effect on florescence,while Spd delayed.Both of GA3 and Spd could prolong florescence,increase flower diameter and flowering formation rate.Both of GA3 and Spd significantly promoted photosynthetic rate(Pn),stomatal conductance(Gs)and intercellular CO2 concentration(Ci).The transpiration rate(Tr)increased by GA3,but inhibited by Spd.Both of GA3 and Spd had relieve effect on decline of chlorophyll content at the end of the flowering.MDA content in petals significantly decreased treated with GA3 and Spd,and the activities of SOD,POD and CAT increased.At the same time,The decrease of SOD activity in the end flowering stage was slowed down treated with GA_3 and Spd,relieved the ageing process,and extended the flowering.In conclusion,it was better with 1 600 mg L^-1GA3 and 0.10 mmol L^(–1)Spd,could improve effectively the quality of flowers.

关 键 词：杜鹃 花期 GA3 SPD 光合特性 抗氧化酶 

分 类 号：S685.21[农业科学—观赏园艺]