›› 2019, Vol. 31 ›› Issue (3): 355-364.DOI: 10.3969/j.issn.1004-1524.2019.03.02

• Crop Science • Previous Articles     Next Articles

Investigation on photosynthetic characteristics of flag leaves of several hybrid rice cultivars in dough stage

YE Zipiao1, YIN Jianhua2, CHEN Xianmao3, AN Ting1, DUAN Shihua4,*   

  1. 1.Maths & Physics College, Jinggangshan University, Ji'an 343009, China;
    2.Rice Research Institute, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China;
    3. Soil Fertilizer and Environmental Resources Institute, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China;
    4. School of Life Sciences, Jinggangshan University, Ji'an 343009, China
  • Received:2018-06-14 Online:2019-03-25 Published:2019-04-08

Abstract: In order to investigate the photosynthetic characteristics of flag leaves of hybrid rice in dough stage, the gas exchange data of four hybrid rice cultivars (Shen95you1326, Wufengyou1326, Ganxiangyou1326 and restorer line JR1326) were performed by LI-6400 portable photosynthesis measurement system. The results showed that the chlorophyll content of Wufengyou1326 was 33.41% and 16.83% higher than that of Shen95you1326 and Ganxiangyou1326. There was no difference between the maximum electron transport rate of Wufengyou1326 and Shen95you1326 or the maximum net photosynthetic rate of Wufengyou1326 and Shen95you1326 (P>0.05). However, there was a significant difference between the two rice cultivars and Ganxiangyou1326 in the maximum electron transport rate and the maximum net photosynthetic rate (P<0.05). The minimum average life-time of the Wufengyou1326 of pigment molecules in the excited state was 14.89% longer than Shen95you1326 and Ganxiangyou1326, and the intrinsic cross-section of pigment molecules of Shen95you1326 was 28.71% higher than Wufengyou 1326, and the instantaneous water-use efficiency of Shenyou1326 was 34.99% and 16.71% more than that of Wufengyou1326 and Ganxiangyou1326. The results revealed that photosynthetic capacity of rice cultivars was not only related to chlorophyll content, but also to intrinsic absorption cross-section and minimum average life time in the lowest excited state. The interaction of these factors determined the maximum electron transport rate and the maximum net photosynthetic rate of rice. Therefore, the selected rice cultivars should have some special characteristics such as higher intrinsic absorption cross-section, shorter minimum average life time in the lowest excitation state and higher chlorophyll content.

Key words: rice, photosynthesis, photosynthetic parameter, minimum average life-time, effective absorption cross-section

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