水分胁迫对夏蜡梅气孔行为的影响  

Effect of Water Stress on Stomatal Behavior of Sinocalycanthus chinensis Leaves

作　　者：柯世省[1] 

机构地区：[1]台州学院生命科学学院,浙江临海317000

出　　处：《河北师范大学学报（自然科学版）》2007年第6期797-801,共5页Journal of Hebei Normal University：Natural Science

基　　金：浙江省自然科学基金(Y504220);浙江省教育厅科研计划项目(20030769)

摘　　要：了解干旱对夏蜡梅光合作用的影响状况,为夏蜡梅的保护和培育提供理论依据,以盆栽2年生夏蜡梅幼苗为材料,分对照、轻度、中度、重度4组,研究了土壤水分胁迫下气孔导度的变化.结果表明:随着水分胁迫的加重,净光合速率、蒸腾速率和气孔导度降低;夏蜡梅气孔导度日变化曲线由双峰型逐渐转变为峰值很小的单峰型,与净光合速率有较好的相关性.重度水分胁迫下气孔限制和非气孔限制(为主)引起夏蜡梅净光合速率成倍降低,严重影响其生长.The objectives of the study were to define the effect of drought on photosynthesis and in theory to provide a scientific basis for conservation and cultivation of Sinocalycanthus chinensis, an endangered species in China. The changes of stomatal conductance（Gs） under four water conditions were investigated by using 2-year-old pot-cultured S. chinensis seedlings as experimental materials. Twelve pots of the plant seedlings with a similar growth were divided into 4 groups （no stress, mild stress, moderate stress and severe stress）. The results showed as follows. With increases in water stress, some photosynthetic parameters reduced, including net .photo- synthetic rate （Pn）, transpiration rate （Tr） and Gs. Moreover, the diurnal variation pattern of Gsshifted from a double-peaked curve gradually to a single-peaked one, exhibiting a closer relation of Gs to Pn. Gemination reduce of P, may be attributed to non-stomatal limitation predominatingly and stomatal limitation secondarily under the heavy stress,brought out a strong growth inhibition of S. chinensis.

关 键 词：水分胁迫 气孔导度 日变化 夏蜡梅 

分 类 号：Q945[生物学—植物学]