干旱区生态环境知识资源中心(Arid): Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved

Arid

DOI	10.3389/fpls.2023.1235923
	Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved
	Dominguez, Deolindo Luis Esteban; Cavagnaro, Juan Bruno; Ros, Juana Panasiti; Le, Anh Tuan; Chung, Yong Suk; Cavagnaro, Pablo Federico
通讯作者	Cavagnaro, PF
来源期刊	FRONTIERS IN PLANT SCIENCE
ISSN	1664-462X
出版年	2023
卷号	14
英文摘要	IntroductionThe use of drought tolerant genotypes is one of the main strategies proposed for coping with the negative effects of global warming in dry lands. Trichloris crinita is a native forage grass occupying extensive arid and semi-arid regions in the American continent, and used for range grazing and revegetation of degraded lands. MethodsTo identify drought-tolerant genotypes and possible underlying physiological mechanisms, this study investigated drought tolerance in 21 genetically diverse T. crinita genotypes under natural field conditions. The accessions were grown under irrigated (control) and drought conditions for 84 days after initiation of the drought treatment (DAIDT), which coincided with flowering initiation. Various morpho-physiological traits were monitored, including total-, foliage-, and root biomass yield, dry matter partitioning to individual plant organs (roots, leaves, stems, and panicles), total leaf area, chlorophyll content, photochemical efficiency of photosystem II, stomatal conductance, and number of panicles per plant. Results and discussionBroad and significant variation (p<0.001) was found among the accessions for all the traits. Three highly tolerant and three very sensitive accessions were identified as the most contrasting materials, and their responses to drought stress were confirmed over two years of experiments. Under prolonged drought conditions (84 DAIDT), the tolerant accessions were generally more productive than the rest for all the biomass yield components analyzed, and this was associated with a postponed and more attenuated decrease in variables related to the plant photosynthetic activity, such as stomatal conductance, chlorophyll content, and photochemical efficiency. In contrast to previous findings, our data indicate no direct relationship between drought tolerance and the level of aridity in the accessions natural habitats, but rather suggest genetic heterogeneity and ample variation for drought tolerance in T. crinita natural populations derived from a particular location or environment. Also, having low total and forageable biomass yield, or increased biomass allocation to the roots (i.e., lower foliage/root ratio), under optimal water availability, were not associated with greater drought tolerance. The drought-tolerant accessions identified are of value for future genetic research and breeding programs, and as forage for range grazing and revegetation in arid regions.
英文关键词	Leptochloa crinita drought stress photoassimilates partitioning biomass stomatal conductance photochemical efficiency
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:001050058900001
WOS关键词	WATER-STRESS ; MOLECULAR PHYLOGENY ; BIOMASS ALLOCATION ; 3 VARIETIES ; POACEAE ; GROWTH ; PLANTS ; CHLORIDOIDEAE ; RESISTANCE ; MONTE
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/2XILL650/396587
推荐引用方式 GB/T 7714	Dominguez, Deolindo Luis Esteban,Cavagnaro, Juan Bruno,Ros, Juana Panasiti,et al. Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved[J],2023,14.
APA	Dominguez, Deolindo Luis Esteban,Cavagnaro, Juan Bruno,Ros, Juana Panasiti,Le, Anh Tuan,Chung, Yong Suk,&Cavagnaro, Pablo Federico.(2023).Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved.FRONTIERS IN PLANT SCIENCE,14.
MLA	Dominguez, Deolindo Luis Esteban,et al."Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved".FRONTIERS IN PLANT SCIENCE 14(2023).