干旱区生态环境知识资源中心(Arid): Variation in seed traits among Mediterranean oaks in Tunisia and their ecological significance

Arid

DOI	10.1093/aob/mcz211
	Variation in seed traits among Mediterranean oaks in Tunisia and their ecological significance
	Amimi, Nabil; Dussert, Stephane; Vaissayre, Virginie; Ghouil, Hana; Doulbeau, Sylvie; Costantini, Carlo; Ammari, Youssef; Joet, Thierry
通讯作者	Joet, T
来源期刊	ANNALS OF BOTANY
ISSN	0305-7364
EISSN	1095-8290
出版年	2020
卷号	125 期号:6 页码:891-904
英文摘要	Background and Aims Oaks are the foundation and dominant tree species of most Mediterranean forests. As climate models predict dramatic changes in the Mediterranean basin, a better understanding of the ecophysiology of seed persistence and germination in oaks could help define their regeneration niches. Tunisian oaks occupy distinct geographical areas, which differ in their rainfall and temperature regimes. and are thus a valuable model to investigate relationships between seed traits and species ecological requirements. Methods Seed morphological traits, desiccation sensitivity level, lethal freezing temperature. embryonic axis and cotyledon sugar and lipid composition, and seed and acorn germination rates at various constant temperatures were measured in Querrus canariensis, Q. coccifera, Q. ilex and Q. suber, using seeds sampled in 22 Tunisian woodlands. Key Results Only faint differences were observed for desiccation sensitivity in the oak species studied. By contrast, the species differed significantly in sensitivity to freezing, germination rates at low temperature and base temperature. Querrus ilex and Q. canariensis, which occur at high elevations where frost events are frequent, showed the lowest freezing sensitivity. A significant correlation was found between hexose contents in the embryonic axis and freezing tolerance. Significant interspecific differences in the time for seeds to germinate and the time for the radicle to pierce the pericarp were observed. The ratio of pericarp mass to acorn mass differed significantly among the species and was negatively correlated with the acorn germination rate. Quercus coccifera, which is frequent in warm and arid environments, showed the highest acorn germination rate and synchrony. Conclusions Seed lethal temperature, seed germination time at low temperatures, the ratio of pericarp mass to acorn mass and the embryonic axis hexose content appeared to be key functional traits that may influence the geographical ranges and ecological requirements of Mediterranean oaks in Tunisia.
英文关键词	Desiccation-sensitive seeds seed functional traits germination oak acorn Quercus canariensis Quercus coccifera Quercus ilex Quercus saber recalcitrant seeds drought freezing tolerance Mediterranean climate
类型	Article
语种	英语
开放获取类型	Green Published, Bronze
收录类别	SCI-E
WOS记录号	WOS:000553098400006
WOS关键词	ASIAN EVERGREEN OAKS ; QUERCUS-ROBUR L ; DESICCATION SENSITIVITY ; SUBGENUS CYCLOBALANOPSIS ; FREEZING TOLERANCE ; QUANTAL RESPONSE ; CASTANEA-SATIVA ; GERMINATION ; DROUGHT ; SURVIVAL
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
来源机构	French National Research Institute for Sustainable Development
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325250
作者单位	[Amimi, Nabil; Ammari, Youssef] INRGREF Thnis, Lab Ecol Forestiere, Rue Hedi EL Karray El Menzah IV,BP 10, Ariana 2080, Tunisia; [Amimi, Nabil; Ghouil, Hana] Univ Carthage, Fac Sci Bizerte, Jarzouna 7021, Tunisia; [Dussert, Stephane; Vaissayre, Virginie; Doulbeau, Sylvie; Joet, Thierry] Univ Montpellier, IRD, UMR DIADE, BP 64501, F-34394 Montpellier, France; [Costantini, Carlo] Univ Montpellier, MIVEGEC, CNRS, IRD, Montpellier, France
推荐引用方式 GB/T 7714	Amimi, Nabil,Dussert, Stephane,Vaissayre, Virginie,et al. Variation in seed traits among Mediterranean oaks in Tunisia and their ecological significance[J]. French National Research Institute for Sustainable Development,2020,125(6):891-904.
APA	Amimi, Nabil.,Dussert, Stephane.,Vaissayre, Virginie.,Ghouil, Hana.,Doulbeau, Sylvie.,...&Joet, Thierry.(2020).Variation in seed traits among Mediterranean oaks in Tunisia and their ecological significance.ANNALS OF BOTANY,125(6),891-904.
MLA	Amimi, Nabil,et al."Variation in seed traits among Mediterranean oaks in Tunisia and their ecological significance".ANNALS OF BOTANY 125.6(2020):891-904.