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The roles and interactions of ethylene with gibberellins in the far-red enriched light-mediated growth of Solanum lycopersicum seedlings

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Abstract

Wild type (WT) tomato seedlings responded to a low red to far-red (R/FR) ratio with increased stem elongation, similar leaflet area expansion and lower shoot ethylene levels. The levels of endogenous growth-active GA1 and its immediate precursor GA20 were decreased by low R/FR ratio, whereas the levels of GA1 catabolite, GA8, increased. To examine the interaction of ethylene with GAs in regulating tomato shoot growth under low R/FR ratio, transgenic (T) seedlings bearing Le-ACS2 and Le-ACS4 antisense mRNA were utilized. Low R/FR ratio increased stem elongation and decreased ethylene levels in T tomato shoots, as it did in WT shoots. However, T stems were significantly taller than the WT stems under low R/FR ratio. Leaflet areas were significantly larger for T, than WT seedlings under both R/FR ratios. Low R/FR ratio did not decrease endogenous levels of GA1 and GA20 in T shoots, but did increase GA8 levels, which were higher than in WT shoots. These results, and hormone/inhibitor application studies, showed that in tomato shoots subjected to low R/FR ratio, GAs play a growth-promotive role in stem elongation, whereas ethylene is growth-inhibitory. Further, these results may imply that decreasing ethylene production under low R/FR ratio causes increases in stem elongation and GA levels.

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Acknowledgments

We would like to thank Ms. Linda J. Walton for technical assistance with ethylene analysis, Ms. Bonnie Smith and Mr. Ken Girard for excellent greenhouse assistance. This work was funded by NSERC (Canada) grants to ECY and DMR, and Research Grant Council (Hong Kong SAR) grant to WKY.

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Correspondence to Leonid V. Kurepin.

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Kurepin, L.V., Yip, WK., Fan, R. et al. The roles and interactions of ethylene with gibberellins in the far-red enriched light-mediated growth of Solanum lycopersicum seedlings. Plant Growth Regul 61, 215–222 (2010). https://doi.org/10.1007/s10725-010-9465-x

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  • DOI: https://doi.org/10.1007/s10725-010-9465-x

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