Internode Elongation Ability and <I>SK2</I> Gene Expression in Common Wild Rice Under Deep Water
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Abstract
Common wild rice is an important genetic resource since its adaptability to inappropriate environments such as floods or drought conditions. The objective of this study was to evaluate the internode elongation ability and the expression of SK2 gene of common wild rice of Lamphun (WLP), Chiang Mai (WCM) and Roi Et (WRE) and Surin (WSR). The experiment was conducted in randomized complete block design (RCBD) with 3 replications. At sixty days old seeding, wild rice plants were submerged in the cement pot with water level up to 90% of the wild rice plant height in the deep water treatment for 14 day. Internode elongation ability were determined by recording of culm length, number of node and internode length. The results showed that the highest culm length, the highest number of node (3 nodes) and the highest internode elongation at internode 2, 3 and 4 (11.0, 7.6 and 2.9 cm, respectively). Considering the expression levels of SK2 gene, the WLP illustrated the highest expression level. Positive correlations between culm length, internode elongation and the expression of SK2 were found. Taken together, the results of this study showed that SK2 gene is involved in response to deep water by internode elongation. The present research can be used as a basic information in selecting common wild rice germplasm for deep water rice breeding program.
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References
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