Chinese Journal of Agrometeorology ›› 2014, Vol. 35 ›› Issue (01): 80-84.doi: 10.3969/j.issn.1000-6362.2014.01.012

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Effects of Different Duration of High Temperature Stress During Filling Stages on Leaf Photosynthetic and Fluorescence Parameters of Early Rice

YANG Zai qiang,LI Ling li,YIN Jian min,WANG Xue lin,SUN Qing,GU Li li   

  • Received:2013-06-03 Online:2014-02-20 Published:2015-02-10

Abstract: Using Jiangxi early rice “Wuyou 157” as material, three duration time of high temperature stress (35℃/28℃, day temperature/night temperature,30℃/25℃ as control), 3d (HT3d), 6d (HT6d) and 9d (HT9d), were carried out in the filling stage in artificial climate chamber at Nanjing University of Information Science and Technology from March to July, 2012.Three leaves of rice (flag leaf, pour leaf of rice, inverse two leaves of rice) were selected to measure light response curve and photosynthetic and fluorescence parameters after high temperature stress for 1,3,6,9 and 12d, respectively. The results showed that,(1)leaves chlorophyll content, net photosynthetic rate, light saturation point, PSⅡ maximum photochemical efficiency and PSⅡ actual quantum yield of three leaves decreased with stress time expansion. (2)The light use efficiency of three rice leaves were decreased by 47.29%, 71.21% and 79.72% of control after high temperature treatment for 3, 6 and 9d, respectively. (3)The maximum photosynthetic rate of rice leaves were 63.28% and 32.04%, and the Fv/Fm were 86.64% and 62.57% of control after high temperature treatment for 6d and 9d, respectively. The results showed that if high temperature stress lasts less than 6d, rice leaves can recover their photosynthetic capacity gradually at suitable temperature; while high temperature stress reaches or exceeds 6d, the photosynthesis system get irreversible seriously hurt.

Key words: Early rice, High temperature stress, Chlorophyll fluorescence, Photosynthesis