干旱区生态环境知识资源中心(Arid): Effects of root phenotypic changes on the deep rooting of Populus euphratica seedlings under drought stresses

Arid

DOI	10.7717/peerj.6513
	Effects of root phenotypic changes on the deep rooting of Populus euphratica seedlings under drought stresses
	Ye, Zi-qi 1,2; Wang, Jian-ming 1; Wang, Wen-juan 1; Zhang, Tian-han 1; Li, Jing-wen 1
通讯作者	Li, Jing-wen
来源期刊	PEERJ
ISSN	2167-8359
出版年	2019
卷号	7
英文摘要	Background: Deep roots are critical for the survival of Populus euphratica seedlings on the floodplains of arid regions where they easily suffer drought stress. Drought typically suppresses root growth, but P. euphratica seedlings can adjust phenotypically in terms of root-shoot allocation and root architecture and morphology, thus promoting deep rooting. However, the root phenotypic changes undertaken by P. euphratica seedlings as a deep rooting strategy under drought conditions remain unknown. Methods: We quantified deep rooting capacity by the relative root depth (RRD), which represents the ratio of taproot length to plant biomass and is controlled by root mass fraction (RMF), taproot mass fraction (TRMF), and specific taproot length (STRL). We recorded phenotypic changes in one-year-old P. euphratica seedlings under control, moderate and severe drought stress treatments and assessed the effects of RMF, TRMF, and STRL on RRD. Results: Drought significantly decreased absolute root depth but substantially increased RRD via exerting positive effects on TRMF, RMF, and STRL. Under moderate drought, TRMF contributed 55%, RMF 27%, and STRL 18% to RRD variation. Under severe drought, the contribution of RMF to RRD variation increased to 37%, which was similar to the 41% for TRMF. The contribution of STRL slightly increased to 22%. Conclusion: These results suggest that the adjustments in root architecture an d root-shoot allocation were predominantly responsible for deep rooting in P. euphratica seedlings under drought conditions, while morphological changes played a minor role. Moreover, P. euphratica seedlings rely mostly on adjusting their root architecture to maintain root depth under moderate drought conditions, whereas root-shoot allocation responds more strongly under severe drought conditions, to the point where it plays a role as important as root architecture does on deep rooting.
英文关键词	Drought Deep rooting Root architecture Root phenotypic plasticity Root-shoot allocation Populus euphratica
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	Green Published, Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000460030200011
WOS关键词	SYSTEM TOPOLOGY ; BIOMASS ALLOCATION ; SOIL-MOISTURE ; PLANT ; WATER ; GROWTH ; MORPHOLOGY ; RESPONSES ; TRAITS ; PERFORMANCE
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217899
作者单位	1.Beijing Forestry Univ, Coll Forestry, Beijing, Peoples R China; 2.Chinese Acad Forestry, Inst Forest Ecol Environm & Protect, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Ye, Zi-qi,Wang, Jian-ming,Wang, Wen-juan,et al. Effects of root phenotypic changes on the deep rooting of Populus euphratica seedlings under drought stresses[J]. 北京林业大学,2019,7.
APA	Ye, Zi-qi,Wang, Jian-ming,Wang, Wen-juan,Zhang, Tian-han,&Li, Jing-wen.(2019).Effects of root phenotypic changes on the deep rooting of Populus euphratica seedlings under drought stresses.PEERJ,7.
MLA	Ye, Zi-qi,et al."Effects of root phenotypic changes on the deep rooting of Populus euphratica seedlings under drought stresses".PEERJ 7(2019).