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Effect of Various Intensities of Drought Stress on δ<sup>13</sup>C Variation among Plant Organs in Rice: Comparison of Two Cultivars

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American Journal of Plant Sciences 2014年第11期5卷 1686-1693页

作者： Mana Kano-Nakata jiro tatsumi Yoshiaki Inukai Shuichi Asanuma Akira Yamauchi Center for Bioresource Field Science Kyoto Institute of Technology Kyoto Japan Graduate School of Bioagricultural Sciences Nagoya University Aichi Japan Graduate School of Bioagricultural Sciences Nagoya University Aichi Japan International Corporation Center for Agricultural Education (ICCAE) Nagoya University Aichi Japan International Corporation Center for Agricultural Education (ICCAE) Nagoya University Aichi Japan

The δ13C value is widely used to assess the effects of drought on water status in plants. However, there is little information regarding the δ13C signature in different organs of rice. We conducted a field study to examine whether the δ13C among different plant parts would be affected by the intensities of drought, and to evaluate genotypic variation in δ13C fluctuation among plant parts affected by drought intensities. Two cultivars, “Nipponbare” (Oryzasativa ssp. japonica) and “Kasalath” (O. sativa ssp. indica), were grown in the field with a line-source sprinkler system. The δ13C values of panicles, flag leaves, straws, culms, and roots were measured from plant samples. The δ13C value increased as drought stress increased, especially in the panicles and roots. “Nipponbare” showed higher values of δ13C than “Kasalath” under the well-watered and mild drought stress conditions, but there was no significant difference between the genotypes in the δ13C value under the severe drought stress condition. The variation in δ13C value among different plant parts was also increased with increasing drought stress. In contrast, these variations were small under well-watered conditions. Furthermore, there was much greater variation in the δ13C value among different plant parts in “Kasalath” than in “Nipponbare” when the plants were grown under drought stress conditions. A significant negative relationship was observed between the δ13C value of panicles and shoot dry matter production, suggesting that the δ13C value of panicles may be the best indicator of plant water status in rice.

关键词： δ13C Drought Plant Parts Rice

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