夏秋季旱涝胁迫对红叶石楠光合特性的影响

园艺学报 ›› 2007, Vol. 34 ›› Issue (1): 163-172.

夏秋季旱涝胁迫对红叶石楠光合特性的影响

曹　晶; 姜卫兵^*; 翁忙玲;姜　武

(南京农业大学园艺学院, 南京210095)

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-02-25 发布日期:2007-02-25

Effects of Drought and Flooding Stress on Photosynthetic Characteristics ofPhotinia frasery in Summer and Autumn

CAO Jing;JIANGWei-bing^*
; WENG Mang-ling; JIANG Wu

(College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)

Received:1900-01-01 Revised:1900-01-01 Online:2007-02-25 Published:2007-02-25

摘要/Abstract

摘要： 分别于夏、秋两季, 以1年生红叶石楠扦插苗为试材, 采用盆栽调控水分的方法, 研究了干
旱和淹水胁迫下叶片的丙二醛(MDA) 含量和细胞膜透性、色素含量以及光合生理参数等的变化。结果表
明, 夏、秋季干旱和淹水胁迫均使叶片MDA含量和质膜透性显著上升, 叶绿素(Chl. ) 含量降低, 花色
素苷(Ant. ) 含量增加; 净光合速率( Pn) 、水分利用效率(WUE) 、表观量子效率(AQY) 和羧化效率
(CE) 等指标下降, 光饱和点(LSP) 降低; 光补偿点(LCP) 升高, 可利用的光强范围变小; 夏季水分胁
迫对红叶石楠的膜伤害大于秋季, Chl. 降幅低于秋季, 类胡萝卜素(Car. ) 含量夏季上升而秋季下降,
LSP对降及LCP上升的幅度小于秋季, 但Pn降幅却表现为干旱处理小于秋季, 淹水处理大于秋季; 其中夏
季淹水胁迫对红叶石楠膜伤害和Pn、WUE、AQY、CE的影响较干旱胁迫大, 光合下降在胁迫初期为气孔
限制, 到中、后期转化为非气孔限制; 与Pn密切相关的气候因子(关联度从高到低排列) 依次为大气温
度( Ta) 、大气CO₂浓度(CO2 ) 和光照强度( PFD) 。而在秋季, 干旱胁迫对红叶石楠膜伤害和Pn、
WUE、AQY和CE的影响较淹水胁迫大, 光合下降主要表现为非气孔限制; 与Pn密切相关的气候因子
(关联度从高到低排列) 依次为大气水汽压(Vp) 、PFD和CO₂。

关键词: 红叶石楠, 水分胁迫, 光合特性, 膜伤害

Abstract: By controlling the soilwater content, 1-year-old potted cutting plants of Photinia frasery as the
materials, the effects of drought and flooding stress on the changes of malondialdehyde (MDA) content, the
membrane permeability, p igment content aswell as photosynthetic and physiological characters in summer and
autumn were studied. The results showed that MDA content, membrane permeability and anthocyanin (Ant)
content were distinctly increased, while the content of chlorophyll, the index values of net photosynthesis rate
( Pn) , water use efficiency (WUE) , apparent quantum yield (AQY) and carboxylation efficiency (CE) were
decreased. Meanwhile the available light intensity range was shortened with the declining of light saturation
point (LSP) and rising of light compensation point (LCP) under drought and flooding stress in summer and
autumn. On the other hand, the chlorophyll (Chl. ) content of control in summer was lower than that in au
tumn, but the values of Pn and CE in summerwere higher than these in autumn. In addition, the membrane
injury of Photinia frasery under drought and flooding stress in summerwasworse than autumn, the degradation
of Chl. in summerwas lower than autumn, the carotinoid (Car. ) content increased in summer and decreased
in autumn, the decrease of LSP and increase of LCP in summerwere lower than autumn, but the decrease of
Pn under drought stress in summer was lower than autumn, and the decrease of Pn under flooding stress in summerwas higher than autumn; moreover, flooding in summer had much more influence on membrane injury
and Pn, WUE, AQY, CE than drought stress, the decrease of Pn in initial stage was due to stomatal limita
tion, and then nonstomatal limitation dominated. The gray relational grade analysis showed that the relation
ship among climate factors and Pn ( from high to low) were temperature of atmosphere (Ta) , CO₂ concentra
tion and photon fluxdensity ( PFD). While drought in autumn had much more influence on membrane injury
and Pn, WUE, AQY, CE than flooding stress, the decrease of Pn wasmainly decided by nonstomatal limita
tion; The gray relational grade analysis showed that the retational factors to Pn ( from high to low) were Vapor
p ressure (Vp) , PFD, and then CO₂ concentration.

Key words: Photinia frasery, Water stress, Photosynthetic characteristics, Membrane injury

曹　晶;姜卫兵;翁忙玲;姜　武. 夏秋季旱涝胁迫对红叶石楠光合特性的影响[J]. 园艺学报, 2007, 34(1): 163-172.

CAO Jing;JIANGWei-bing;WENG Mang-ling;JIANG Wu. Effects of Drought and Flooding Stress on Photosynthetic Characteristics ofPhotinia frasery in Summer and Autumn[J]. ACTA HORTICULTURAE SINICA, 2007, 34(1): 163-172.

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