PJB-2018-271
CO2-exchange and chlorophyll fluorescence responses of forage grasses during salt stress and recovery in Qinghai-Tibetan Plateau (QTP)
Muhammad Arfan, Chao Zhang, Da-Wei Zhang, Da-Xu Li, Jia-Jun Yan, Ming-Hong You, Shi-Qie Bai and Hong-Hui Lin
Abstract
Grassland degradation has become a core issue in research and policy due to recognition of the magnitude of anthropogenic and environmental threats in Qinghai-Tibetan Pleatu (QTP). The problem of soil salinity could worsen in recent scenario of global change. Therefore, an urgent need exists to select salt efficient forage species for sustaining ecosystem services in varying environment. The aim of this study was to investigate different level of salinity treatments and, recovery situations in three forage species (Avena sativa L., Elymus sibiricus L., and Phalaris arundinacea L.). The results showed that increase in salinity level was associated with more symptoms of damage while recovery benefited with the effects being different among three species. Gas exchange (Pn rates and iWUE) and chlorophyll fluorescence (qP, NPQ, Fv/Fm and ΦPSII) parameters revealed Elymus sibiricus performance better followed by Phalaris arundinacea. Similar trend was discovered through relative water content (RWC) and electrolyte leakage (EL) results. On the other hand, Avena sativa screened as the most salt sensitive among these three species. Taken together, these results identified Elymus sibiricus as relatively more salt-tolerant species, followed by Phalaris arundinacea in QTP environment.
To Cite this article:
Arfan, M., C. Zhang, D.W. Zhang, D.X. Li, J.J. Yan, M.H. You, S.Q. Bai and H.H. Lin. 2019. CO2-exchange and chlorophyll fluorescence responses of forage grasses during salt stress and recovery in Qinghai-Tibetan plateau (QTP). Pak. J. Bot., 51(5): DOI: http://dx.doi.org/10.30848/PJB2019-5(5)
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