Adolf, VI and Shabala, S and Andersen, MN and Razzaghi, F and Jacobsen, SE, Varietal differences of quinoa's tolerance to saline conditions, Plant and Soil, 357, (1) pp. 117-129. ISSN 0032-079X (2012) [Refereed Article]
Copyright 2012 Springer Science+Business Media B.V.
Aims This study aimed to assess varietal differences of quinoa’s tolerance to salinity and to investigate physiological mechanisms conferring these differences.
Methods Production of biomass in fourteen varieties grown under saline conditions was analysed in a pot experiment. For two contrasting varieties, the Danish variety Titicaca and the Bolivian variety Utusaya gas exchange, chlorophyll content index (CCI), fluorescence and ion relations were studied.
Results Responses to salinity differed greatly among the varieties; least affected were two varieties from the Bolivian altiplano and a variety from Peru. Titicaca and Utusaya both had substantially increased K+ concentrations in the leaf sap. But, Utusaya was much more efficient in restricting xylem Na+ loading. Xylem Na+ and K+ loading were found to be uncoupled. Utusaya maintained a relatively high stomatal conductance resulting in an only 25% NaCl-induced reduction in net CO2 assimilation compared to a 67% reduction in salt treated Titicaca plants. Maximum photochemical efficiency of PSII was not affected by salinity.
Conclusion In addition to maintaining high gas exchange, tolerant varieties better control xylemNa+ loading. To what extent this control is related to radial root Na+ uptake or to the activity of Na+/H+-exchangers at the xylem parenchyma boundary remains to be studied.
|Item Type:||Refereed Article|
|Keywords:||abiotic stress, photosynthesis, stomatal conductance, chlorophyll, ion uptake, sodium, potassium|
|Research Division:||Biological Sciences|
|Research Group:||Plant Biology|
|Research Field:||Plant Biology not elsewhere classified|
|Objective Division:||Plant Production and Plant Primary Products|
|Objective Group:||Summer Grains and Oilseeds|
|Objective Field:||Summer Grains and Oilseeds not elsewhere classified|
|Author:||Shabala, S (Professor Sergey Shabala)|
|Web of Science® Times Cited:||54|
|Deposited By:||Agricultural Science|
|Downloads:||15 View Download Statistics|
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