AI Article Synopsis
- Deepwater rice can extend its leaves and stems above floodwaters to access oxygen, with key growth regulated by specific genetic traits (QTLs).
- The study found that internode elongation only starts after the sixth leaf stage and primarily affects the sixth and seventh internodes, indicating a developmental trigger for growth under flooding conditions.
- Gibberellins (GAs), a type of phytohormone, are critical for this elongation process; inhibiting GAs stops growth, while supplying them can stimulate elongation, showing their essential role in deepwater rice adaptation.
Article Abstract
Under flooded conditions, the leaves and internodes of deepwater rice can elongate above the water surface to capture oxygen and prevent drowning. Our previous studies showed that three major quantitative trait loci (QTL) regulate deepwater-dependent internode elongation in deepwater rice. In this study, we investigated the age-dependent internode elongation in deepwater rice. We also investigated the relationship between deepwater-dependent internode elongation and the phytohormone gibberellin (GA) by physiological and genetic approach using a QTL pyramiding line (NIL-1 + 3 + 12). Deepwater rice did not show internode elongation before the sixth leaf stage under deepwater condition. Additionally, deepwater-dependent internode elongation occurred on the sixth and seventh internodes during the sixth leaf stage. These results indicate that deepwater rice could not start internode elongation until the sixth leaf stage. Ultra-performance liquid chromatography tandem mass-spectrometry (UPLC-MS/MS) method for the phytohormone contents showed a deepwater-dependent GA1 and GA4 accumulation in deepwater rice. Additionally, a GA inhibitor abolished deepwater-dependent internode elongation in deepwater rice. On the contrary, GA feeding mimicked internode elongation under ordinary growth conditions. However, mutations in GA biosynthesis and signal transduction genes blocked deepwater-dependent internode elongation. These data suggested that GA biosynthesis and signal transduction are essential for deepwater-dependent internode elongation in deepwater rice.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4282320 | PMC |
| http://dx.doi.org/10.1111/pce.12377 | DOI Listing |
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