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VOL. 6, ISSUE 6 (2021)
Gas exchange and photochemical efficiency of transplanted seedlings of Jatropha curcas. L: accessions under salinity
Authors
Sujatha Edupuganti, Sudhir Ejnavarzala, Suhas P Wani, Gajanan Sawargaonkar
Abstract
Jatropha (Jatropha curcas L.) has been used as a biofuel source for a long time. However, Jatropha photosynthesis and photochemical reaction investigations have gotten a lot less attention, especially regarding salinity. As a result of the injury caused to the leaf photosynthetic machinery, salt stress is a severe environmental constraint for its establishment. The study is aimed at evaluating the impact of salinity (100 mM and 15 mM NaCl) on gas exchange parameters such as net photosynthetic rate (Pn), transpiration rate (E) and, stomatal conductance (Gs), and maximal photochemical efficiency of PSII (Fv/Fm) and quantum efficiency of PSII (ϕPSII) of Jatropha. Six accessions viz., A6002, A6004, A6007, A6008, A6011, and A6014 of Jatropha transplanted seedlings were subjected to 100 mM and 15 mM NaCl for 360 days. A6002, A6004, A6007, and A6008 accessions were sensitive to salinity as growth (in terms of height, stem girth, leaf area, and dry weight of shoot and root) gas exchange measurements, SPAD chlorophyll, Fv/Fm and ϕPSII were significantly decreased at 150 mM NaCl at 360 DAT. However, when exposed to 150 mM NaCl at 360 DAT, the accessions A6011 and A6014 showed no significant decline in Pn, Gs, E, Fv/Fm, and ϕPSII, indicating that PSII function was preserved by suppressing photo-oxidative damage and thereby main taining carboxylation efficiency. As a result, we can conclude that A6011 and A6014 accessions were more resistant to NaCl stress, whereas A6002, A6004, A6007, and A6008 accessions were more sensitive.
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Pages:418-426
How to cite this article:
Sujatha Edupuganti, Sudhir Ejnavarzala, Suhas P Wani, Gajanan Sawargaonkar "Gas exchange and photochemical efficiency of transplanted seedlings of <em>Jatropha curcas</em>. L: accessions under salinity ". International Journal of Botany Studies, Vol 6, Issue 6, 2021, Pages 418-426
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