Author(s)

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.

δ¹³C, Drought, Plant Parts, Rice

Kano-Nakata, M. , Tatsumi, J. , Inukai, Y. , Asanuma, S. and Yamauchi, A. (2014) Effect of Various Intensities of Drought Stress on δ¹³C Variation among Plant Organs in Rice: Comparison of Two Cultivars. American Journal of Plant Sciences, 5, 1686-1693. doi: 10.4236/ajps.2014.511183.