Response of Yield and Morphological Characteristic of Rice Cultivars to Heat Stress at Different Growth Stages
The high temperatures during sensitive growth phases are changing rice morphology as well as influencing yield. In the glass house study, the treatments were growing conditions [normal growing (32oC+2) and heat stress (38oC+2) day time and 22oC+2 night time], growth stages (booting, flowering and ripening) and four cultivars (Hovaze, Hashemi, Fajr, as exotic and MR219 as indigenous). The heat chamber was prepared covered with plastic, and automatic heater was adjusted for two weeks in every growth stages. Rice morphological and yield under the influence of heat stress during various growth stages showed taller plants in Hashemi due to its tall character. The total tillers per hill were significantly higher in Fajr. In all growing conditions, Hashemi recorded higher panicle exertion. The flag leaf width in all situations was found higher in Hovaze. The total tillers per hill were more in Fajr, although heat stress was imposed during booting and flowering stages. The indigenous MR219 in all situations of growing conditions, growth stages recorded higher grain yield. However, its grain yield decreased when heat stress was imposed during booting and flowering. However, plants had no effect on heat stress during ripening stage.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1090540Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2860
 Ceccarelli, S., et al., ''Plant breeding and climate changes. The Journal of Agricultural Science,'' 2010. 148(6): p. 627.
 Guilioni, L., J. Wery, and F. Tardieu,'' Heat stress-induced abortion of buds and flowers in pea: is sensitivity linked to organ age or to relations between reproductive organs?'' Annals of Botany, 1997. 80(2): p. 159-168.
 Li, W.-B., H. Wang, and F.-S. Zhang, ''Effects of silicon on anther dehiscence and pollen shedding in rice under high temperature stress.'' Acta Agronomica Sinica, 2005. 1: p. 025.
 Matsui, T., K. Omasa, and T. Horie, ''The difference in sterility due to high temperatures during the flowering period among japonica-rice varieties''. plant production science-tokyo-, 2001. 4(2): p. 90-93.
 Oh-e, I., K. Saitoh, and T. Kuroda, ''Effects of high temperature on growth, yield and dry-matter production of rice grown in the paddy field''. Plant production science, 2007. 10(4): p. 412-422.
 Porter, J.R., ''Rising temperatures are likely to reduce crop yields.'' Nature, 2005. 436(7048): p. 174-174.
 Shah, F., et al., ''Impact of high-temperature stress on rice plant and its traits related to tolerance.'' J Agric Sci, 2011. 149: p. 545-556.
 Watanabe, T. and T. Kume, ''A general adaptation strategy for climate change impacts on paddy cultivation:'' special reference to the Japanese context. Paddy and Water Environment, 2009. 7(4): p. 313-320.
 Yin, X., M.J. Kropff, and J. Goudriaan, ''Differential effects of day and night temperature on development to flowering in rice.'' Annals of Botany, 1996. 77(3): p. 203-213.
 Yoshida, S., ''Effects of temperature on growth of the rice plant (Oryza sativa L.) in a controlled environment.'' Soil Science and Plant Nutrition, 1973. 19(4): p. 299-310.
 Yoshida, S., ''Fundamentals of rice crop science.'' 1981: Int. Rice Res. Inst.