PJB-2020-405
EFFECT OF SALT STRESS ON GROWTH AND PHOTOSYNTHESIS PHYSIOLOGY OF TWO TOBACCO CULTIVARS
ZIA ULLAH
Abstract
Salt stress is one of the most serious abiotic stress and the cultivation area affected by salt stress is growing, which seriously affects the plants growth and development. In the current study, chlorophyll content, gas exchanges, chlorophyll fluorescence, and genes transcriptional changes were compared in two local cultivars [(HonghuaDaJinYuan (H), Zhongyan100 (Z)] of tobacco (Nicotiana tabacum), in response to salt treatments (0, 100 mM and 150 mM NaCl) for 10 days. Salt-induced stress significantly affected the fresh weight (FW) of the cultivars, and the lowest FW was measured at 150 mM. Likewise, the photosystem II (PSII) quantum yield (QY_Lss) and photochemical quenching coefficient (qP_Lss) were comparatively highly decreased in Z than H, by the salt treatments. In addition, the photosynthetic rate and stomatal conductance were highly decreased in Z than H cultivar. However, chlorophyll content was significantly enhanced in H at both levels of salinity, while significantly decreased in Z at 150 mM. Taken all together, better gas exchanges, higher expression of photosynthesis-related and salt-responsive genes, suggested H as tolerant cultivar to salinity than Z cultivar.
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