华南农业大学学报
華南農業大學學報
화남농업대학학보
JOURNAL OF SOUTH CHINA AGRICULTURAL UNIVERSITY
2015年
1期
85-90
,共6页
白晶晶%吴俊文%李吉跃%何茜%邱权%潘昕
白晶晶%吳俊文%李吉躍%何茜%邱權%潘昕
백정정%오준문%리길약%하천%구권%반흔
竹柳%尾巨桉%干旱胁迫%叶绿素荧光
竹柳%尾巨桉%榦旱脅迫%葉綠素熒光
죽류%미거안%간한협박%협록소형광
bamboo willow%Eucalyptus urophylla ×E.grandis%drought stress%chlorophyll fluorescence
目的对华南地区2个速生树种尾巨桉Eucalyptus urophylla × E.grandis和竹柳( bamboo willow )的抗旱性进行比较.方法采用干旱胁迫处理,利用脉冲调制式叶绿素荧光仪( OS5 P-美国)对2树种叶绿素荧光参数进行测定.结果和结论在干旱胁迫条件下,实际光量子产量( Yield)、表观光合电子传递速率( ETR)、光化学淬灭系数(qP)、最大荧光(Fm)和PSⅡ最大光化学效率(Fv/Fm)均有不同程度的下降,在干旱处理第24天,尾巨桉ETR比对照下降48.02%,而竹柳仅下降25.12%;到重度干旱时期,尾巨桉和竹柳Fv/Fm 分别下降31.55%和21.84%;供试树种的非光化学淬灭系数( qN)、初始荧光( F0)均呈上升趋势,与对照相比,竹柳qN上升幅度为217.59%,显著大于尾巨桉(146.40%,P<0.05),F0上升幅度(49.11%)小于尾巨桉(92.03%);2种树种ETR与土壤含水量均呈极显著正相关(P<0.01),尾巨桉F0与土壤含水量呈极显著负相关(P<0.01),竹柳Fm 和Fv/Fm 与土壤含水量呈极显著正相关(P<0.01).研究结果表明:在干旱胁迫下,竹柳与尾巨桉叶绿素荧光参数间均表现一定相关性,相比尾巨桉,竹柳在叶绿素荧光参数上表现出更强的抗旱性.
目的對華南地區2箇速生樹種尾巨桉Eucalyptus urophylla × E.grandis和竹柳( bamboo willow )的抗旱性進行比較.方法採用榦旱脅迫處理,利用脈遲調製式葉綠素熒光儀( OS5 P-美國)對2樹種葉綠素熒光參數進行測定.結果和結論在榦旱脅迫條件下,實際光量子產量( Yield)、錶觀光閤電子傳遞速率( ETR)、光化學淬滅繫數(qP)、最大熒光(Fm)和PSⅡ最大光化學效率(Fv/Fm)均有不同程度的下降,在榦旱處理第24天,尾巨桉ETR比對照下降48.02%,而竹柳僅下降25.12%;到重度榦旱時期,尾巨桉和竹柳Fv/Fm 分彆下降31.55%和21.84%;供試樹種的非光化學淬滅繫數( qN)、初始熒光( F0)均呈上升趨勢,與對照相比,竹柳qN上升幅度為217.59%,顯著大于尾巨桉(146.40%,P<0.05),F0上升幅度(49.11%)小于尾巨桉(92.03%);2種樹種ETR與土壤含水量均呈極顯著正相關(P<0.01),尾巨桉F0與土壤含水量呈極顯著負相關(P<0.01),竹柳Fm 和Fv/Fm 與土壤含水量呈極顯著正相關(P<0.01).研究結果錶明:在榦旱脅迫下,竹柳與尾巨桉葉綠素熒光參數間均錶現一定相關性,相比尾巨桉,竹柳在葉綠素熒光參數上錶現齣更彊的抗旱性.
목적대화남지구2개속생수충미거안Eucalyptus urophylla × E.grandis화죽류( bamboo willow )적항한성진행비교.방법채용간한협박처리,이용맥충조제식협록소형광의( OS5 P-미국)대2수충협록소형광삼수진행측정.결과화결론재간한협박조건하,실제광양자산량( Yield)、표관광합전자전체속솔( ETR)、광화학쉬멸계수(qP)、최대형광(Fm)화PSⅡ최대광화학효솔(Fv/Fm)균유불동정도적하강,재간한처리제24천,미거안ETR비대조하강48.02%,이죽류부하강25.12%;도중도간한시기,미거안화죽류Fv/Fm 분별하강31.55%화21.84%;공시수충적비광화학쉬멸계수( qN)、초시형광( F0)균정상승추세,여대조상비,죽류qN상승폭도위217.59%,현저대우미거안(146.40%,P<0.05),F0상승폭도(49.11%)소우미거안(92.03%);2충수충ETR여토양함수량균정겁현저정상관(P<0.01),미거안F0여토양함수량정겁현저부상관(P<0.01),죽류Fm 화Fv/Fm 여토양함수량정겁현저정상관(P<0.01).연구결과표명:재간한협박하,죽류여미거안협록소형광삼수간균표현일정상관성,상비미거안,죽류재협록소형광삼수상표현출경강적항한성.
Objective] A comparison of drought resistance was made between two fast-growing species in South China, Eucalyptus urophylla ×E.grandis (EE for abbr.) and bamboo willow (BW for abbr.).[Method]Effective quantum yield of PSⅡ photochemistry ( Yield ) , apparent electron transport rate ( ETR) , the photochemical quenching ( qP ) , the non-photochemical quenching ( qN) , minimal fluores-cence(F0), maximal fluorescence(Fm), potential photochemical efficiency of PSⅡ(Fv/Fm) in EE and BW were tested by OS5P pulse modulated chlorophyll fluorometer under drought stress .[Result and con-clusion] Yield, ETR, qP, Fm and Fv/Fm all declined during the drought .At day 24 after treatment, ETR declined by 48.02% and 25.12% EE and BW , respectively.qN and F0 in the 2 species in-creased.qN in BW rose by 217.59%, which was significantly higher than that in EE (146.40%, P<0.05).The relative increment in F0 in BW (49.11%) was smaller than that in EE (92.03%) at the end of the drought treatment .Correlation analyses were made concerning chlorophyll fluorescence charac-teristics and soil water content .In both species , ETR showed a significant positive correlation with soil water content ( P<0.01 ) .F0 in EE showed a significant negative correlation with soil water content (P<0.01).Fm and Fv/Fm of BB and soil water content showed a significant positive correlation (P<0.01).These results indicate that correlations existe among chlorophyll fluorescence characteristics in two species under drought.BW has greater drought resistance than EE as revealed by chlorophyll fluo-rescence characteristics.