Indexing

Enhancement of Rice Pollen viability under Heat Stress by Osmoprotectant Foliar Spray

Author: GBN Jyothi, S Mohanty, S. Das, D. Lenka, T.R. Mohanty, J.K. Beura and A. Moharana

PDF Download PDF

Abstract

Loss of pollen viability by heat stress is a major problem which directly affect the seed set and yield of the crop. To mitigate the deleterious effects of heats stress on viability of rice pollen a study conducted for the enhancement of pollen viability by exogenous osmoprotectants spray in the cropping year 2018-19 and 2019-20 on three rice varieties Hiranmayee, Naveen and Mandakini by sowing in three different dates (S1, S2 and S3). Heat stress gradually reduced pollen viability with rise of heat stress and delay of sowing, higher pollen viability recorded during 1st date of sowing followed by 2nd and 3rd date of sowing. As a result of the osmoprotectant foliar spray, the third date of sowing observed percent higher pollen viability over untreated control, compared to 1st and 2nd dates of sowing. Foliar spray of osmoprotectants significantly improved pollen viability especially with treatments like Salicylic acid 400 ppm (68.78%)followed by Ascorbic acid (10 ppm) + Citric acid (1.5%) (67.93%) and Salicylic acid 800 ppm (67.09%). Significant reduction of pollen viability under heat stress was noted in untreated Control (59.39%).

Keywords

Pollen viability, Heat stress, Osmoprotectants, Foliar spray

Conclusion

Pollen grains are highly sensitive to heats stress because of desiccation, heat stress gradually reduce pollen viability which effect the pollination and fertilization of plant. Osmoprotectant foliar spray treatments maintained the viability of pollen grain even under heat stress condition among the treatments significant higher pollen viability recorded from the treatments Salicylic acid 400 ppm followed by Ascorbic acid (10 ppm) + Citric acid (1.5%) and Salicylic acid 800 ppm, whereas the lowest pollen viability of all treatments recorded from untreated Control.

References

-

How to cite this article

GBN Jyothi, S Mohanty, S. Das, D. Lenka, T.R. Mohanty, J.K. Beura and A. Moharana (2022). Enhancement of Rice Pollen viability under Heat Stress by Osmoprotectant Foliar Spray. Biological Forum – An International Journal, 14(4): 343-347.