Elsevier, Journal of Genetics and Genomics, 11(41), p. 605-608
DOI: 10.1016/j.jgg.2014.09.004
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Strigolactones have been proposed as a novel class of plant hormones to regulate many other aspects of plant development in addition to inhibiting shoot branching. We observed, here, that the strigolactone-related rice mutants, such as d3 and d10, exhibited an increased lamina joint inclination phenotype at the seedling stage but not at the later stages. The exogenous treatment of GR24, a synthetic SL analog, rescued the increased lamina joint inclination phenotype of a SL biosynthetic mutant, d10, but did not affect the lamina joint inclination of a SL signaling mutant, d3, at the seedling stage. The observation of transverse and longitudinal sections of the lamina joint regions indicated that both length and cell numbers of the middle region and the length of the adaxial epidermis in the lamina joints of d3 and d10 were obviously increased compared to the wild type. These results indicate that SLs inhibit the lamina joint inclination at the seedling stage by regulating cell division of the lamina joint regions.