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Abstract

To study the genetic variability for salt tolerant F6 lines from Fsd-08 x S-24 cross, the experiment was carried out in Botanical Gardens of the Bahauddin Zakariya University, Multan, Pakistan. The findings demonstrated that salt negatively impacted nearly all growth and yield indices. For example, plants grown under high saline (200 mM NaCl) conditions were smaller in plant height, produced smaller spikes and showed fewer spikelets. In addition, high salinity stress also decreased the total grain yield per plant and 100 seed weight. Line 5 and 15 had greater photosynthetic capacity to produce greater number of fertile tillers, and florets in spikelets. To assess the impact of excessive salt stress on PS II's photochemical efficiency, a polyphasic chlorophyll a fluorescence transient was measured. Our results showed that salt stress reduced the Fo, Fv, Fi and Fm in all lines/varieties. salt stress decreased the Ψo and ΦEo in most of the wheat lines, while it increased the ΦDo particularly in wheat lines Line 6, 12 and line 13. Plants response to salinity depends on PSII ability under this stress (Kalaji et al., 2011). Our results showed the decline in the effective ΦPSII, qL, and maximum Fv/Fm in wheat lines, parents, and some check varieties under salt stress. Conversely, an increase in ΦNPQ, NPQt, and ΦNO was observed in present studied lines and varieties under salt stress. Lines 9, 12, 13 showed better performance in term of ΦPSII, line 9, 11, 12, 13 and var. AAS showed better performance in term of ΦNO. While line 8, 9 showed maximal value of Fv/Fm as compared to others. Line 2, 11 showed maximum value in ΦNPQ, while line 11 also showed maximum value of NPQt as compared to others under salt stress. In present study, value of gH+ as well as vH+ increased in some wheat lines under stress of salts. In ECSt the increase was maximum in Line 2, 11. It is concluded from current study that, tolerance of salt stress was differed among these lines and varieties due to presence genetic variability. F6 lines from Fsd-08 x S-24 cross (line 5 and 15) showed better growth, photosynthetic performance, and yield production. Chlorophyll fluorescence showed variable response in these studied lines and varieties. Thus biomass, photosynthetic capacity and to examine salt tolerance in wheat, yield parameters can be utilized as selection criteria. To study the genetic variability for salt tolerant F6 lines from Fsd-08 x S-24 cross, the experiment was carried out in Botanical Gardens of the Bahauddin Zakariya University, Multan, Pakistan. The findings demonstrated that salt negatively impacted nearly all growth and yield indices. For example, plants grown under high saline (200 mM NaCl) conditions were smaller in plant height, produced smaller spikes and showed fewer spikelets. In addition, high salinity stress also decreased the total grain yield per plant and 100 seed weight. Line 5 and 15 had greater photosynthetic capacity to produce greater number of fertile tillers, and florets in spikelets. To assess the impact of excessive salt stress on PS II's photochemical efficiency, a polyphasic chlorophyll a fluorescence transient was measured. Our results showed that salt stress reduced the Fo, Fv, Fi and Fm in all lines/varieties. salt stress decreased the Ψo and ΦEo in most of the wheat lines, while it increased the ΦDo particularly in wheat lines Line 6, 12 and line 13. Plants response to salinity depends on PSII ability under this stress (Kalaji et al., 2011). Our results showed the decline in the effective ΦPSII, qL, and maximum Fv/Fm in wheat lines, parents, and some check varieties under salt stress. Conversely, an increase in ΦNPQ, NPQt, and ΦNO was observed in present studied lines and varieties under salt stress. Lines 9, 12, 13 showed better performance in term of ΦPSII, line 9, 11, 12, 13 and var. AAS showed better performance in term of ΦNO. While line 8, 9 showed maximal value of Fv/Fm as compared to others. Line 2, 11 showed maximum value in ΦNPQ, while line 11 also showed maximum value of NPQt as compared to others under salt stress. In present study, value of gH+ as well as vH+ increased in some wheat lines under stress of salts. In ECSt the increase was maximum in Line 2, 11. It is concluded from current study that, tolerance of salt stress was differed among these lines and varieties due to presence genetic variability. F6 lines from Fsd-08 x S-24 cross (line 5 and 15) showed better growth, photosynthetic performance, and yield production. Chlorophyll fluorescence showed variable response in these studied lines and varieties. Thus biomass, photosynthetic capacity and to examine salt tolerance in wheat, yield parameters can be utilized as selection criteria.

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