Abstract
Sugarcane grown under a wide range of agro-climatic conditions accounts for ~80% of the sugar production worldwide. Since sugarcane productivity is severely affected by abiotic stresses and hence, an experiment was conducted for two consecutive years during 2020 and 2021 on popular sub-tropical sugarcane varieties. The experiment was laid out in two-factorial RBD consisting of nine sugarcane genotypes (Co 98014, Co 0118, Co 0238, Co 05011, Co 06034, Co 09022, Co 12029, Co 15023 and Co 15027) and salinity treatments (Control, ECiw ~ 4, 8 and 12 dS m−1) in 5 replications. Two budded setts were planted in pots and irrigated with saline water of respective levels till formative phase and observed the build-up in electrical conductivity of soil extract (ECse) from 0.48 (control) to 2.99, 4.81 and 7.08; while further saline irrigation increased the ECse values to 4.48, 6.24 and 9.33 dS m−1 in treatments ECiw ~ 4, 8 and 12 dS m−1, respectively. Increase in soil EC decreased plant survival by 24.1, 47.0 and 79.6% under continued irrigation of ECiw ~ 4, 8, 12 dS m−1 with respect to control. Continued saline irrigation caused significant reduction in growth, which was associated with reduction in relative water content (RWC) and gas exchange traits. RWC decreased by 4.91 to 21.9%, chlorophyll content by 8.46 to 32.75%, photosynthetic rate (Pn) by 16.85 to 91.44%, stomatal conductance by 14.96 to 84.25%, transpiration rate by 14.13% to 89.8% and chlorophyll fluorescence by 5.33 to 42.67% from ECiw ~ 4 to 12 dS m−1, respectively. Significant variations in Na+ and K+ ion content was observed under elevated saline condition in roots, leaves and juice extract of genotypes. Na+/K+ ratio, an important trait for screening salinity tolerance, increased in all genotypes as compared to control, the increase was predominant in susceptible varieties. Single cane weight (SCW) was drastically affected by saline irrigation, with a reduction of 36.4, 68.5 and 83.5% at ECiw ~ 4, 8 and 12 dS m−1, respectively as compared to control, with similar declining trend in juice quality. Based on our results, Co 0238, Co 0118 and Co 98014 were tolerant to salinity stress by maintaining higher Pn, lower leaf Na+/K+ ratio, higher SCW and higher juice sucrose content.
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Claims 14
Claim · model-written summary
Continued saline irrigation raised soil electrical conductivity.
Not reportedComparator
Verbatim
e0“further saline irrigation increased the ECse values to 4.48, 6.24 and 9.33 dS m−1 in treatments ECiw ~ 4, 8 and 12 dS m−1, respectively”
t0“Sugarcane”
Claim · model-written summary
Saline irrigation reduced plant survival by 24.1, 47.0 and 79.6% at increasing salinity levels.
Verbatim
e0“Increase in soil EC decreased plant survival by 24.1, 47.0 and 79.6% under continued irrigation of ECiw ~ 4, 8, 12 dS m−1 with respect to control”
t0“Sugarcane”
Claim · model-written summary
Saline irrigation significantly reduced growth.
Not reportedComparator
Verbatim
e0“Continued saline irrigation caused significant reduction in growth”
t0“Sugarcane”
Claim · model-written summary
Relative water content declined by 4.91 to 21.9% across salinity levels.
Not reportedTreatmentComparator
Verbatim
e0“RWC decreased by 4.91 to 21.9%”
t0“Sugarcane”
Claim · model-written summary
Chlorophyll content declined by 8.46 to 32.75%.
Not reportedTreatmentComparator
Verbatim
e0“chlorophyll content by 8.46 to 32.75%”
t0“Sugarcane”
Claim · model-written summary
Photosynthetic rate declined by 16.85 to 91.44%.
Not reportedTreatmentComparator
Verbatim
e0“photosynthetic rate (Pn) by 16.85 to 91.44%”
t0“Sugarcane”
Claim · model-written summary
Stomatal conductance declined by 14.96 to 84.25%.
Not reportedTreatmentComparator
Verbatim
e0“stomatal conductance by 14.96 to 84.25%”
t0“Sugarcane”
Claim · model-written summary
Transpiration rate declined by 14.13% to 89.8%.
Not reportedTreatmentComparator
Verbatim
e0“transpiration rate by 14.13% to 89.8%”
t0“Sugarcane”
Claim · model-written summary
Chlorophyll fluorescence declined by 5.33 to 42.67%.
Not reportedTreatmentComparator
Verbatim
e0“chlorophyll fluorescence by 5.33 to 42.67%”
t0“Sugarcane”
Claim · model-written summary
Elevated salinity changed Na+ and K+ content in roots, leaves and juice.
- Taxon
- Sugarcanet0
- Organ / stage
- roots, leaves and juice extracte0
- Treatment
- elevated saline conditione0
- Outcome
- Na+ and K+ ion contente0
Not reportedComparatorDirection
Verbatim
e0“Significant variations in Na+ and K+ ion content was observed under elevated saline condition in roots, leaves and juice extract of genotypes”
t0“Sugarcane”
Claim · model-written summary
Na+/K+ ratio increased in all genotypes, especially susceptible varieties.
- Taxon
- Sugarcanet0
- Outcome
- Na+/K+ ratioe0
- Direction
- increasede0
- Qualifier
- susceptible varietiese0
- Comparator
- controle0
Not reportedTreatment
Verbatim
e0“Na+/K+ ratio, an important trait for screening salinity tolerance, increased in all genotypes as compared to control, the increase was predominant in susceptible varieties”
t0“Sugarcane”
Claim · model-written summary
Single cane weight fell by 36.4, 68.5 and 83.5% at increasing salinity levels.
Verbatim
e0“Single cane weight (SCW) was drastically affected by saline irrigation, with a reduction of 36.4, 68.5 and 83.5% at ECiw ~ 4, 8 and 12 dS m−1, respectively as compared to control”
t0“Sugarcane”
Claim · model-written summary
Juice quality declined with saline irrigation.
Not reportedTreatmentComparator
Verbatim
e0“with similar declining trend in juice quality”
t0“Sugarcane”
Claim · model-written summary
Co 0238, Co 0118 and Co 98014 were identified as salinity tolerant with favorable physiological and quality traits.
- Taxon
- Sugarcanet0
- Material
- Co 0238, Co 0118 and Co 98014e0
- Treatment
- salinity stresse0
- Outcome
- tolerant to salinity stresse0
Not reportedComparatorDirection
Verbatim
e0“Co 0238, Co 0118 and Co 98014 were tolerant to salinity stress by maintaining higher Pn, lower leaf Na+/K+ ratio, higher SCW and higher juice sucrose content”
t0“Sugarcane”
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