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Open AccessArticle

Water Deficit Transcriptomic Responses Differ in the Invasive Tamarix chinensis and T. ramosissima Established in the Southern and Northern United States

1
Agronomy, Horticulture and Plant Science, South Dakota State University, Brookings, SD 57007, USA
2
BioSystems Networks/Translational Research, South Dakota State University, Brookings, SD 57007, USA
3
United States Department of Agriculture, Agricultural Research Service, Northern Plains Agricultural Research Laboratory, Sidney, MT 59270, USA
*
Authors to whom correspondence should be addressed.
Indicates co-first authors.
Plants 2020, 9(1), 86; https://doi.org/10.3390/plants9010086
Received: 29 October 2019 / Revised: 27 December 2019 / Accepted: 2 January 2020 / Published: 9 January 2020
(This article belongs to the Section Plant Genetics and Genomics)
Tamarix spp. (saltcedar) were introduced from Asia to the southern United States as windbreak and ornamental plants and have spread into natural areas. This study determined differential gene expression responses to water deficit (WD) in seedlings of T. chinensis and T. ramosissima from established invasive stands in New Mexico and Montana, respectively. A reference de novo transcriptome was developed using RNA sequences from WD and well-watered samples. Blast2GO analysis of the resulting 271,872 transcripts yielded 89,389 homologs. The reference Tamarix (Tamaricaceae, Carophyllales order) transcriptome showed homology with 14,247 predicted genes of the Beta vulgaris subsp. vulgaris (Amaranthaceae, Carophyllales order) genome assembly. T. ramosissima took longer to show water stress symptoms than T. chinensis. There were 2068 and 669 differentially expressed genes (DEG) in T. chinensis and T. ramosissima, respectively; 332 were DEG in common between the two species. Network analysis showed large biological process networks of similar gene content for each of the species under water deficit. Two distinct molecular function gene ontology networks (binding and transcription factor-related) encompassing multiple up-regulated transcription factors (MYB, NAC, and WRKY) and a cellular components network containing many down-regulated photosynthesis-related genes were identified in T. chinensis, in contrast to one small molecular function network in T. ramosissima. View Full-Text
Keywords: Tamarix; tamarisk; saltcedar; Tamaricaceae; RNA-Seq; water deficit; invasive species Tamarix; tamarisk; saltcedar; Tamaricaceae; RNA-Seq; water deficit; invasive species
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Swaminathan, P.; Ohrtman, M.; Carinder, A.; Deuja, A.; Wang, C.; Gaskin, J.; Fennell, A.; Clay, S. Water Deficit Transcriptomic Responses Differ in the Invasive Tamarix chinensis and T. ramosissima Established in the Southern and Northern United States. Plants 2020, 9, 86.

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