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Combined effects of drought and moderately high temperature on the photosynthesis, PS II photochemistry and yield traits in rice (Oryza sativa L.)

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Abstract

Leaf photosynthesis, which determines the yield in rice, is greatly affected by heat and drought stresses during reproductive phenophase. The effect of short term natural high temperatures above 35 °C and drought in the range of − 50 to − 70 kPa was assessed on leaf photosynthesis (PN), stomatal conductance (gs), transpiration rate (Tr), chlorophyll fluorescence (Fv/Fm) and yield characteristics in three rice cultivars (ADT 43, TKM 9 and N 22). Drought stress coupled with natural high temperature was imposed at two critical phenophases i.e., at panicle initiation (PI) and anthesis stages under rain out shelter facility. N 22 was found to be the tolerant genotype followed by TKM 9. ADT 43 was observed to be susceptible genotype. Irrespective of genotypes, stress at anthesis stage caused more severe yield reduction compared to stress at PI stage. ADT 43 recorded photosynthetic rate of (20.5 µmol CO2 m−2s−1), stomatal conductance of (0.23 mol H2O m−2s−1) transpiration rate of (3.8 mmol H2O m−2s−1) and Fv/Fm value of (0.34) with 62.70% of yield reduction under stress, while N 22 recorded higher photosynthetic rate with less reduction per cent over control (28.47%) and Fv/Fm value (0.41) with 31.22% of yield reduction during stress at anthesis stage. The tolerance of N 22 over other varieties showed that lesser reduction of photosynthetic gas exchange and minimal damage to PS II photochemistry was the major physiological mechanism underlying stress tolerance in rice.

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Abbreviations

Fv/Fm:

Chlorophyll fluorescence

gs :

Stomatal conductance

PI:

Panicle initiation

PN :

Photosynthetic rate

PSII:

Photosystem II

TDMP:

Total dry matter production

Tr :

Transpiration rate

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Correspondence to Nirmal Kumar Amjikarai Radhakrishna.

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Amjikarai Radhakrishna, N., Chenniappan, V. & Dhashnamurthi, V. Combined effects of drought and moderately high temperature on the photosynthesis, PS II photochemistry and yield traits in rice (Oryza sativa L.). Ind J Plant Physiol. 23, 408–415 (2018). https://doi.org/10.1007/s40502-018-0386-4

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