Enhancing the Assessment of Pre-Harvest Sprouting Phenotyping in Rice: A comprehensive Protocol Integrating Field and Laboratory Evaluations

• Published in: Russian journal of plant physiology 2024-06, Vol.71 (3), Article 84
• Main Authors: Shalem Raju, R., Hanjagi, P. S., Awaji, S. M., Goud, B. Raghavendra, Bhaskar, S. Shraddha, Srinivas, T., Suneetha, Y.
• Format: Article
• Language: English
• Subjects: Biomedical and Life Sciences; Climate change; Cluster analysis; Clustering; Crop improvement; Crop yield; Economic impact; Farmers; Flow resistance; Flowering; Food quality; Genotypes; Germination; Grain; Harvesting; Laboratories; Life Sciences; Phenotyping; Plant Physiology; Plant Sciences; Population growth; Population studies; Research Papers; Rice
• ISSN: 1021-4437; 1608-3407
• DOI: 10.1134/S1021443724604841

Rice is a significant staple crop that provides food and livelihoods for millions of people worldwide. However, climate change and frequent cyclonic storms with heavy rains during grain maturation periods have led to a significant reduction in rice yield and quality (20–30%) due to pre-harvest sprouting (PHS) damage. PHS has become a widespread issue globally, resulting in significant economic losses for Indian farmers, amounting to billions of rupees annually and severely impacting the country’s economy. Developing protocol and PHS-resistant rice genotypes is essential to mitigate the significant economic losses experienced by farmers and meet the growing demand for food grain with the increasing population. This study was aimed to developing the efficient protocol to identify PHS-resistant rice genotypes by evaluating 96 genotypes under laboratory and field conditions at 20, 25, 30, 35 and 40 days after flowering (DAF). To evaluate the PHS resistant genotypes we have developed the efficient and standard protocol for the present study. The results showed a positive correlation between phenotypic responses under laboratory and field conditions. Based on the germination percentage exhibited under laboratory and field conditions, the genotypes were grouped into four clusters using K-clustering and dendrogram clustering analysis. Out of 96 genotypes evaluated 19 grouped as highly susceptible (45 to 88%), 14 were moderately susceptible (10 to 45%), 51 were moderately resistant (0.10 to 10.00%), and 12 were highly resistant with zero percent germination at all flowering stages. The study also evaluated the genotypes for days to germination from 20 to 40 DAF. The highly susceptible genotypes germinated earlier (3 days) than moderately susceptible and resistant genotypes (4 to 6 days). Zero days were assigned to highly resistant genotypes since no germination was recorded. In nutshell, the novel PHS-resistant rice genotypes identified in this study could serve as donors for future crop improvement programs.