Indexing

Effect of Heat Stress on Grain Quality of different Rice Varieties

Author: Priyanka Singh, Amitha Mithra Sevanthi, Shalini Gaur Rudra, Ashok Kumar Singh and Nagendra Kumar Singh

PDF Download PDF

Abstract

Rice grain quality is sensitive to heat stress during grain filling. To analyse the effect, twelve different varieties of rice were grown in field and then transferred to pots at their early tillering stage. One set of each genotype was grown under control conditions while another set was shifted to 2-3°C higher temperature in a glasshouse (maintained between 9 AM to 3 PM with diurnal variation). There was a negative impact of high temperature on grain chalkiness and amylose content. Rheological properties, including peak viscosity, breakdown viscosity, final viscosity, and setback viscosity showed significant differences between the control and heat stress. Scanning electron microscopic examination showed that the arrangement of starch granules in rice grains during grain filling stage was affected by high temperature. Developing heat-tolerant rice varieties with improved grain filling, stable starch synthesis and resistance to high temperatures, along with implementing enhanced cultivation practices, can have great potential for sustainable and high-quality rice production.

Keywords

Grain chalkiness, Paste viscosity, High temperature, Rice

Conclusion

In conclusion, high temperature during grain filling in rice showed negative impact on starch accumulation and its composition. Development of rice varieties that are more tolerant to high temperatures during grain filling and stable starch synthesis and packing is essential to overcome these negative effects. This study enlightens the adverse effect of high temperature on rice grain chalkiness and starch qualities, thus exploring the problem at gene level and developing heat tolerant genotypes using molecular breeding approaches is required.

References

-

How to cite this article

Priyanka Singh, Amitha Mithra Sevanthi, Shalini Gaur Rudra, Ashok Kumar Singh and Nagendra Kumar Singh (2023). Effect of Heat Stress on Grain Quality of different Rice Varieties. Biological Forum – An International Journal, 15(5): 662-668.