Journal of Food, Agriculture and Environment
Vol 11,
Issue 2,2013
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Physiological changes in response to salt stress in Atraphaxis bracteata A. Los.
Author(s):
Mei Dong 1,
Jing Qin 2, Kangning He 1*, Han Luo 1, Lei Han 3, Xingbo Hu 1, XinJian Lu 1Recieved Date: 2013-01-04, Accepted Date: 2013-04-28
Abstract:Twenty three-year old seedlings of Atraphaxis bracteata were subjected to salt stress (0, 100, 200 and 400 mM NaCl) in order to study the salt tolerance mechanism of A. bracteata. Results showed that the growth measured in terms of shoot and root fresh mass (FM) and dry mass (DM) were affected negatively by salt stress but the ratio of root/shoot maintained at a high level. Relative water content (RWC) and leaf water potential (ψw) declined significantly under salt stress. There was also an evident increase of Na+ content accompanied by a decrease of K+ content with the increase of salt stress, but the K+/Na+ratio keep relative high. Furthermore, salt stress induced a progressive and evident decrease in net photosynthetic rate (PN), transpiration rate (E), and stomatal conductance (gs) through the analysis of light responses of photosynthesis to photosynthetic photon flux density (PPFD), except for the sharp increase of Ci at 600 mM when PPFD exceeded 1000 µmol m–2 s–1. Both the maximum PN (PN max) and apparent quantum yield (AQY) significantly declined with the increase of NaCl concentration. Salt stress also led to a significant reduction in the light saturation point (LSP) at 600 mM but a dramatic rising trend in the light compensation point (LCP). Moreover, the decreasing PN and E values integrated together resulted in the significant decline of water use efficiency (WUE) with the increase of NaCl concentration. It is concluded that A. bracteata can be widely cultivated in saline regions with high salt tolerance capacity.
Keywords:Growth,
ion accumulation, leaf water potential, net photosynthetic rateJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 2
Category: Environment
Pages: 1221-1226
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