Arid
DOI10.1093/jxb/erg221
Cavitation, stomatal conductance, and leaf dieback in seedlings of two co-occurring Mediterranean shrubs during an intense drought
Vilagrosa, A; Bellot, J; Vallejo, VR; Gil-Pelegrin, E
通讯作者Vilagrosa, A
来源期刊JOURNAL OF EXPERIMENTAL BOTANY
ISSN0022-0957
出版年2003
卷号54期号:390页码:2015-2024
英文摘要

Seedling shrubs in the Mediterranean semi-arid climate are subjected to intense droughts during summer. Thus, seedlings often surpass their limits of tolerance to water stress, resulting in the loss of hydraulic conductivity due to xylem cavitation. The response in terms of stomatal conductance, vulnerability to cavitation, leaf dieback, and survival were analysed in two co-occurring seedlings of mastic tree (Pistacia lentiscus L.) and kermes oak (Quercus coccifera L.) during an intense drought period. Both species reacted to drought with steep decreases in stomatal conductance before the critical water potential brought about the onset of cavitation events. Q. coccifera showed wider safety margins for avoiding runaway embolism than P. lentiscus and these differences could be related to the particular drought strategy displayed by each species: water saver or water spender. The limits for survival, resprout capacity and leaf dieback were also analysed in terms of loss of conductivity. By contrast with previous studies, the species showing higher seedling survival in the presence of drought also showed higher susceptibility to cavitation and operated with a lower safety margin for cavitation. Both species showed a leaf specific conductivity (LSC) threshold below which leaf biomass had to be regulated to avoid runaway embolism. However, each species displayed a different type of response: A lentiscus conserved total leaf area up to 100% loss of LSC, whereas Q. coccifera continuously adjusted leaf biomass throughout the drought period in order to maintain the LSC very close to the maximum values recorded without loss of conductivity. Both species maintained the capacity for survival until the loss of conductivity was very nearly 100%.


英文关键词drought stress leaf dieback Mediterranean shrubs stomatal conductance survival xylem cavitation
类型Review
语种英语
国家Spain
收录类别SCI-E
WOS记录号WOS:000185064100003
WOS关键词XYLEM CAVITATION ; HYDRAULIC CONDUCTANCE ; LAURUS-NOBILIS ; EMBOLISM ; VULNERABILITY ; PLANTS ; PHOTOSYNTHESIS ; TRANSPIRATION ; LIMITATION ; RESISTANCE
WOS类目Plant Sciences
WOS研究方向Plant Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/145127
作者单位(1)Univ Alicante, Dept Ecol, CEAM, E-03080 Alicante, Spain;(2)CEAM, E-46980 Paterna, Spain;(3)SIA DGA, Unidad Recursos Forestales, E-50080 Zaragoza, Spain
推荐引用方式
GB/T 7714
Vilagrosa, A,Bellot, J,Vallejo, VR,et al. Cavitation, stomatal conductance, and leaf dieback in seedlings of two co-occurring Mediterranean shrubs during an intense drought[J],2003,54(390):2015-2024.
APA Vilagrosa, A,Bellot, J,Vallejo, VR,&Gil-Pelegrin, E.(2003).Cavitation, stomatal conductance, and leaf dieback in seedlings of two co-occurring Mediterranean shrubs during an intense drought.JOURNAL OF EXPERIMENTAL BOTANY,54(390),2015-2024.
MLA Vilagrosa, A,et al."Cavitation, stomatal conductance, and leaf dieback in seedlings of two co-occurring Mediterranean shrubs during an intense drought".JOURNAL OF EXPERIMENTAL BOTANY 54.390(2003):2015-2024.
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