干旱区生态环境知识资源中心(Arid): Physiological and biochemical responses at leaf and root levels in two Acacia species (A. cyclops and A. salicina) subjected to dehydration

Arid

DOI	10.15835/nbha49111934
	Physiological and biochemical responses at leaf and root levels in two Acacia species (A. cyclops and A. salicina) subjected to dehydration
	Souden, Samira; Ennajeh, Mustapha; Khemira, Habib
通讯作者	Ennajeh, M (corresponding author), Univ Gabes, Fac Sci Gabes, Lab Biodivers & Valorizat Bioresources Arid Zones, Gabes 6072, Tunisia.
来源期刊	NOTULAE BOTANICAE HORTI AGROBOTANICI CLUJ-NAPOCA
ISSN	0255-965X
EISSN	1842-4309
出版年	2021
卷号	49 期号:1
英文摘要	To set-up afforestation and reforestation projects in arid regions southern Tunisia, several indigenous and exotic forest species were used among them are Acacia spp. However, the success of these projects remains highly sceptical because of the intensified aridity during the last decade. To overcome this issue, the selection of genotypes resistant to severe drought is crucial as first step. For this reason, the aim of the present study is to compare tolerance capacity to severe drought between two Acacia species (A. cyclops and A. salicina) and evaluate efficacy of their biochemical responses at leaf and root levels. Combined physiological and biochemical approaches were adopted. Two-years-old plants of two Acacia species (A. cyclops and A. salicina), frequently used in forestation projects in arid regions southern Tunisia, were subjected to severe water stress by withholding watering during 60 days. At regular intervals, water relations and net photosynthetic rate (P-n) were measured. In addition, the biochemical response was characterized by quantifying one sugar alcohol (arabitol) and three cyclitols (myo-inositol, pinitol and quercitol) in leaves and roots. Our results revealed that A. cyclops was more tolerant to severe drought than A. salicina. The turgor of its leaf tissues and its Pn were less affected. The superiority of A. cyclops to tolerate severe water stress might be attributed to greater efficiency of its biochemical defense mechanisms compared to A. salicina. Comparison of biochemical profiles between species exhibited some differences depending on the organs and the species. For development and survival under severe drought conditions, A. cyclops accomplished efficient osmoregualation and osmoprotection mechanisms by massive accumulation of specific polyols distinctly in leaves and roots. Indeed, compared to A. salicina, A. cyclops accumulated higher amount of arabitol, myo-inositol and quercitol in roots, but pinitol in leaves. So, contents of these polyols might be used as promising criteria for the selection of drought-tolerant Acacia species.
英文关键词	Acacia sp. arabitol cyclitols drought tolerance forestation photosynthesis water relations
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000639294300006
WOS关键词	WATER-USE EFFICIENCY ; OSMOTIC ADJUSTMENT ; DROUGHT STRESS ; GAS-EXCHANGE ; GROWTH ; EUCALYPTUS ; PLANTS ; PHOTOSYNTHESIS ; ACCUMULATION ; SALT
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/2XILL650/351217
作者单位	[Souden, Samira; Ennajeh, Mustapha; Khemira, Habib] Univ Gabes, Fac Sci Gabes, Lab Biodivers & Valorizat Bioresources Arid Zones, Gabes 6072, Tunisia; [Khemira, Habib] Jazan Univ, Ctr Environm Res & Studies CERS, Jazan 82817, Saudi Arabia
推荐引用方式 GB/T 7714	Souden, Samira,Ennajeh, Mustapha,Khemira, Habib. Physiological and biochemical responses at leaf and root levels in two Acacia species (A. cyclops and A. salicina) subjected to dehydration[J],2021,49(1).
APA	Souden, Samira,Ennajeh, Mustapha,&Khemira, Habib.(2021).Physiological and biochemical responses at leaf and root levels in two Acacia species (A. cyclops and A. salicina) subjected to dehydration.NOTULAE BOTANICAE HORTI AGROBOTANICI CLUJ-NAPOCA,49(1).
MLA	Souden, Samira,et al."Physiological and biochemical responses at leaf and root levels in two Acacia species (A. cyclops and A. salicina) subjected to dehydration".NOTULAE BOTANICAE HORTI AGROBOTANICI CLUJ-NAPOCA 49.1(2021).