Risk heat-stress induced spikelet sterility of irrigated lowland rice using RIDEV V2 Model simulations
2018
Punzalan, B.R. | Alcantara, A.J.; Vergara, D.K. | Aunario, J.K.S. | Shi, W. | Ye, C. | Kumar, U, | Psco, R.M. | Shreestha, S. | Laza, R.C. | DingKuhn, M.
Studies show that daytime temperature above 35°C and night-time temperature above 25°C may significantly reduce rice yields by including spikelet sterility when they coincide with flowering, the sensitive stage of crop. Simulations to assess heat-induced spikelet sterility (Ster-Heat) of three popular Philippine rice varieties (IR64; NSIC Rc222; NSIC Rc238) and heat-tolerant aus variety Nagina 22 were conducted using RIDEV (Rice Development Model) V2, a model for rice phenology and sterility based on crop microclimate and panicle temperature. In-depth simulations to evaluate temporal patterns involved General Circulation Models-derived climate data of Los Baños, Laguna (1981-2000, 2010-2049) and Maligaya, Nueva Ecija (1978-1997, 2010-2029); 12 sowing dates representing each month of the year; and two anthesis times (Anth Time): 10.00 and 11.00 H. In both sites, the highest incidence of Sterheat is expected to coincide with the hottest month of the year. The difference in SterHeat between AnthTime 10.00 h and 11.00 h is considerable for Philippine cultivars. Regardless of anthesis time, advancing sowing in the dry season from January to December would reduce the incidence of SterHeat of Philippine cultivars. This strategy may also be considered during the wet season, but may be less crucial. Findings of this study may serve as decision-making tool for stakeholders to mitigate the effects of global warming, specifically SterHeat, by adjusting cropping calendar.
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