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Publication Type J
Authors Nackley, LL; Kim, SH
Author Full Name Nackley, Lloyd L.; Kim, Soo-Hyung
Title A salt on the bioenergy and biological invasions debate: salinity tolerance of the invasive biomass feedstock Arundo donax
Source GLOBAL CHANGE BIOLOGY BIOENERGY
Language English
Document Type Article
Author Keywords biofuel; Carrizo grande; conductance; ecophysiology; photosynthesis; stomata; wetland
Keywords Plus RELATIVE GROWTH-RATE; PHOTOSYNTHETIC CAPACITY; SPARTINA-ALTERNIFLORA; GAS-EXCHANGE; WHOLE-PLANT; WATER-USE; STRESS; DROUGHT; LIMITATIONS; RESPONSES
Abstract Arundo donax L., commonly known as giant reed, is promising biomass feedstock that is also a notorious invasive plant in freshwater ecosystems around the world. Heretofore, the salt tolerance of A.donax had not been quantified even though anecdotal evidence suggests halophytic qualities. To test whole-plant and leaf level responses, we established a pot experiment on 80 scions propagated from an A.donax population that has naturalized on the shore of the San Francisco Bay Estuary. To quantify growth and physiological responses to salinity (NaCl), A.donax scions were divided into eight treatments and grown for 60days across a range of salinities (0-42 dSm(-1)). Classic growth analysis showed >80% reduction in overall growth at the highest salinities. Yet, there was zero mortality indicating that A.donax is able to tolerate high levels of salt. Declining photosynthesis rates were strongly correlated (R-2>0.97) with decreasing stomatal conductance, which was in turn closely related to increasing salinity. Leaf gas exchange revealed that stomata and leaf limitations of carbon dioxide were three times greater at high salinities. Nonetheless, even when salinities were 38-42 dSm(-1)A.donax was able to maintain assimilation rates 7-12molm(-2)s(-1). Further, by maintaining 50% relative growth at salinities similar to 12 dSm(-1)A.donax can now be classified as moderately salt tolerant'. A.donax leaf gas exchange and whole-plant salt tolerance are greater than many important food crops (i.e. maize, rice), the bioenergy feedstock Miscanthusxgiganteus, as well as some uncultivated plant species (i.e. Populus and Salix) that are indigenous in regions A.donax currently invades. The results of this study have implications for both agronomists wishing to expand A.donax to fields dominated by saline soils, and for others who are concerned about the spread of A.donax with altered stream hydrology or sea-level rise.
Author Address [Nackley, Lloyd L.] Univ Cape Town, Dept Biol Sci, ZA-7701 Rhodes Gift, South Africa; [Nackley, Lloyd L.; Kim, Soo-Hyung] Univ Washington Bot Gardens, Seattle, WA 98195 USA; [Kim, Soo-Hyung] Univ Washington, Sch Environm & Forest Sci, Seattle, WA 98195 USA
Reprint Address Nackley, LL (reprint author), Univ Cape Town, Dept Biol Sci, ZA-7701 Rhodes Gift, South Africa.
E-mail Address nackll@uw.edu
ResearcherID Number Kim, Soo-Hyung/A-3012-2009
ORCID Number Kim, Soo-Hyung/0000-0003-3879-4080
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Cited Reference Count 44
Times Cited 6
Total Times Cited Count (WoS, BCI, and CSCD) 6
Publisher WILEY-BLACKWELL
Publisher City HOBOKEN
Publisher Address 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
ISSN 1757-1693
29-Character Source Abbreviation GCB BIOENERGY
ISO Source Abbreviation GCB Bioenergy
Publication Date JUL
Year Published 2015
Volume 7
Issue 4
Beginning Page 752
Ending Page 762
Digital Object Identifier (DOI) 10.1111/gcbb.12184
Page Count 11
Web of Science Category Agronomy; Biotechnology & Applied Microbiology; Energy & Fuels
Subject Category Agriculture; Biotechnology & Applied Microbiology; Energy & Fuels
Document Delivery Number CK8ME
Unique Article Identifier WOS:000356491400017
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