Chinese Journal of Agrometeorology ›› 2016, Vol. 37 ›› Issue (03): 326-334.doi: 10.3969/j.issn.1000-6362.2016.03.008

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Effect of High Temperature on Rice Dry Matter Partition and Yield Component during Booting Stage

LUO Zong-qiang,SHI Chun-lin,JIANG Min,LIU Yang, XUAN Shou-li, JIN Zhi-qing   

  1. 1. College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2.Institute of Agricultural Economy and Information, Jiangsu Academy of Agricultural Sciences, Nanjing 210014
  • Received:2015-10-23 Online:2016-06-20 Published:2016-06-20

Abstract:

In order to explore the influence of dry matter partition and yield component to high temperature, a control experiment with different temperature levels and durations was conducted at booting stage with hybrid rice Lianyoupeijiu and conventional rice Nanjing45. The results showed that photosynthetic rate, harvest index and yield decreased with the increase of high temperature lever and duration. Compared with CK, the photosynthetic rate and yield of Liangyoupeijiu and Nanjing45 declined 44.6%, 81.6% and 28.8%, 87.7% respectively under high temperature treatment at 41℃ for 7 days. High temperature led to the decrease of seed-setting rate and the amount of spikelet, and hindered the movement of the photosynthetic material to the panicle, so the harvest index would be reduced. The stem biomass exceeded 70% of the total plant for Liangyoupeijiu and Nanjing45 under high temperature treatment at 41℃ for 6 days. High temperature resulted in the decrease of grain number per panicle, seed-setting rate and 1000-grain weight and the reducing extent related to high temperature strength and duration. Under heat treatment at 41℃ for 7 days, the grain number per panicle, seed-setting rate and 1000-grain weight of Liangyoupeijiu and Nanjing45 declined 41.9%, 93.5%, 25.3% and 50.1%, 79.6%, 23.7%, respectively. So the most sensitive factor to high temperature was seed-setting rate, and then grain number per panicle, 1000-grain weight.

Key words: Rice, Booting stage, High temperature, Dry matter partition, Yield component