摘要
【目的】探明桃金娘在不同季节下光合特性与生理生态因子相关性以及光系统PSII活性变化情况。【方法】以3年生桃金娘为试验材料,在春季(4月)、夏季(7月)、秋季(10月)、冬季(1月)使用LCi-SD便携式光合仪、手持叶绿素荧光氟笔(FP110 PAR-Fluor Pen)进行测定。【结果】春季和冬季净光合速率(P_(n))都出现“光合午休”属于气孔限制引起,夏季P_(n)出现“光合午休”属于非气孔限制引起;气孔导度(G_(s))、空气相对湿度(HR)以及胞间CO_(2)浓度(C_(i))是影响春季P_(n)主要因子,有效光合辐射(PAR)是影响夏季P_(n)的主要因子,蒸腾速率(T_(r))、G_(s)、C_(i)是影响秋季P_(n)的主要因子,T_(r)、空气CO_(2)浓度(C_(a))是影响冬季P_(n)的主要因子;不同季节光系统PSII活性(F_(v)/F_(m))中夏季最高,冬季最低,春季桃金娘天线色素捕获的能量(ABS/RC)最大;光稳态下夏季量子产率(QY)最大,秋季QY最小;暗处理下的QY夏季最大,春季最小,秋季非化学淬灭(NPQ)最高;春季和冬季桃金娘在光照强度100μmol/(m^(2)·s)时QY最大,夏季和秋季QY随着光照强度增加而减小;随着光照强度增加,不同季节桃金娘光系统PSII的F_(v)/F_(m)呈上升趋势。【结论】不同季节环境变化能导致桃金娘出现气孔限制和非气孔限制“光合午休”现象;不同季节下生理生态因子对光合作用的影响均不同光系统桃金娘PSII活性(F_(v)/F_(m))为夏季>秋季>春季>冬季,ABS/RC为春季>秋季>夏季>冬季,光稳态下QY为夏季>冬季>春季>秋季,最大QY为夏季>冬季>秋季>春季。
【Objective】The present paper aimed to investigate the correlation between photosynthetic characteristics and physiological-ecological factors as well as the changes of photosystem PSII activity in Rhodomyrtus tomentosa under different seasons.【Method】In the experiment,3-year-old R.tomentosa was used as the test material,and the measurement studies were conducted in spring(April),summer(July),autumn(October)and winter(January)using LCi-SD portable photosynthesizer and hand-held chlorophyll fluorescent fluoropen(FP110PAR-FluorPen).【Result】‘Midday depression of photosynthesis’in net photosynthetic rate(P_(n))in both spring and winter was caused by stomatal limitation,and the‘midday depression of photosynthesis’in Pnin summer was caused by non-stomatal limitation.‘Midday depression of photosynthesis’in summer was caused by non-stomatal limitation.Stomatal conductance(G_(s)),relative humidity(HR)and intercellular CO_(2)concentration(C_(i))were the main factors affecting Pnin spring,while effective photosynthetic radiation(PAR)was the main factor affecting Pnin summer.Transpiration rate(T_(r)),Gsand Ciwere the main factors affecting Pnin autumn,while Trand air CO_(2)concentration(C_(a))were the main factors affecting Pnin winter.The PSII activity(F_(v)/F_(m))of the photosystem was the highest in summer and the lowest in winter,and the energy captured by R.tomentosa antenna pigments(ABS/RC)was the highest in spring.Quantum yield(QY)was the highest in summer and the lowest in autumn under photostasis.The QY under darkness was maximum in summer,minimum in spring,and the highest in autumn for NPQ(non-chemical quenching).The R.tomentosa QY was the greatest in spring and winter at a light intensity of 100μmol/(m^(2)·s),and decreased with increasing light intensity in summer and autumn.The F_(v)/F_(m)of R.tomentosa photosystem PSII showed an increasing trend with the increase of light intensity in different seasons.【Conclusion】Environmental changes in different seasons can lead to the phenomenon
作者
杨通文
高秀梅
韩维栋
YANG Tong-wen;GAO Xiu-mei;HAN Wei-dong(College of Coastal Agricultural Sciences,Guangdong Ocean University,Zhanjiang,Guangdong 524088,China)
出处
《西南农业学报》
CSCD
北大核心
2022年第12期2801-2810,共10页
Southwest China Journal of Agricultural Sciences
基金
广东省林业科技创新项目(2019LYKQCX017)。
关键词
桃金娘
光合特性
相关分析
光系统PSII活性
非化学淬灭
量子产率
Rhodomyrtus tomentosa
Photosynthetic characteristics
Correlation analysis
PSII activity of photosystem
Non-chemical quenching
Quantum yield
