What's happening at IRRI
Tuesday, April 26, 2016, 01:15pm - 02:15pm
Resilient rice for water limited and high temperature stress environments
Dr. Bheemanahalli Raju
Heat Stress Physiology
Abstract: Drought and heat stresses are increasingly becoming a major threat to food security worldwide. Sustaining rice yield under these environments is perhaps a major challenge that needs to be addressed to achieve both current and future global food security.
Development of climate smart rice varieties along with saving irrigation water from flooded rice cultivation by employing direct or aerobic rice cultivation has emerged as promising strategies. For rice grown under water limited (saving technologies) efficient water mining, enhanced water use efficiency and cellular level tolerance traits are considered to be highly relevant. Using high throughput phenotyping tools, we have explored the genetic variability of these traits, identified several trait donor lines for use in breeding programs at the Department Crop Physiology, UAS, and Bangalore. Our hypotheses and efforts to improve adaptation of rice to water limited conditions will be discussed.
Increase in frequency and intensity of extreme heat events typically short in duration coinciding with the highly temperature-sensitive flowering stage in rice lowers spikelet fertility significantly, even under resource sufficient conditions. In collaborative efforts between IRRI and Tamil Nadu Agricultural University (Coimbatore, India) successful efforts were made to explore the phenotypic and genetic bases of tolerance to heat stress in rice. In this direction, PRAY (Phonemics of Rice Adaptation and Yield Potential) panel was phenotyped for heat escape, avoidance and tolerance mechanisms related traits. In this presentation, some of our initial findings on traits variations in response to high temperatures stress will be discussed.
Rm A, DL Umali Bldg