An in situ approach to characterizing photosynthetic gas exchange of rice panicle

文献类型： 外文期刊

第一作者： Chang, Tian-Gen

作者： Chang, Tian-Gen;Song, Qing-Feng;Zhao, Hong-Long;Qu, Mingnan;Zhu, Xin-Guang;Zhao, Hong-Long;Zhu, Xin-Guang;Chang, Shuoqi;Xin, Changpeng

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关键词： Rice panicle photosynthesis; Non-foliar photosynthesis; Reproductive organs; In situ photosynthetic characteristics phenotyping; Grain setting rate; P-chamber

期刊名称：PLANT METHODS （ 影响因子：4.993； 五年影响因子：5.312 ）

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年卷期： 2020 年 16 卷 1 期

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收录情况： SCI

摘要： Background Photosynthesis of reproductive organs in C(3)cereals is generally regarded as important to crop yield. Whereas, photosynthetic characteristics of reproductive organs are much less understood as compared to leaf photosynthesis, mainly due to methodological limitations. To date, many indirect methods have been developed to study photosynthesis of reproductive organs and its contribution to grain yield, such as organ shading, application of herbicides and photosynthetic measurement of excised organs or tissues, which might be intrusive and cause biases. Thus, a robust and in situ approach needs to be developed. Results Here we report the development of a custom-built panicle photosynthesis chamber (P-chamber), which can be connected to standard infrared gas analyzers to study photosynthetic/respiratory rate of a rice panicle. With the P-chamber, we measured panicle photosynthetic characteristics of seven high-yielding elitejaponica,japonica-indicahybrid andindicarice cultivars. Results show that, (1) rice panicle is photosynthetically active during grain filling, and there are substantial inter-cultivar variations in panicle photosynthetic and respiratory rates, no matter on a whole panicle basis, on an area basis or on a single spikelet basis; (2) among the seven testing cultivars, whole-panicle gross photosynthetic rates are 17-54 nmol s(-1)5 days after heading under photon flux density (PFD) of 2000 mu mol (photons) m(-2)s(-1), which represent some 20-38% of that of the corresponding flag leaves; (3) rice panicle photosynthesis has higher apparent CO(2)compensation point, light compensation point and apparent CO(2)saturation point, as compared to that of a typical leaf; (4) there is a strong and significant positive correlation between gross photosynthetic rate 5 days after heading on a single spikelet basis and grain setting rate at harvest (Pearson correlation coefficient r = 0.93,pvalue < 0.0001). Conclusions Rice panicle gross photosynthesis is significant, has great natural variation, and plays an underappreciated role in grain yield formation. The P-Chamber can be used as a tool to study in situ photosynthetic characteristics of irregular non-foliar plant organs, such as ears, culms, leaf sheaths, fruits and branches, which is a relatively less explored area in current cereal breeding community.

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