Effects of Seasonal Variation and Gibberellic Acid Treatment on the Growth and Development of Gypsophila paniculata

in HortScience

We investigated the effects of different planting seasons and gibberellic acid treatments on the growth and development of Gypsophila paniculata to explore new approaches to controlling the flowering period. Four different cultivars were selected and continually planted in July, September, and November in the low-latitude and high-altitude region of Kunming, China (25° N, 102° E). Results showed that the vegetative growth and flowering time of Gypsophila paniculata were prolonged and postponed when the planting time was delayed. Specifically, ‘My Pink’ showed 20% and 80% rosette rates when grown in autumn and winter, respectively, thus indicating that Gypsophila paniculata is sensitive to planting time. Moreover, GA3 treatment not only can significantly promote vegetative growth but also can stimulate early flowering and suppress the occurrence of rosettes during winter. This is more specific to ‘My Pink’, which showed 40% and 80% reductions in rosette rates with four and eight GA3 treatment applications, respectively. Our study showed that seasonal variations in the growth and development of Gypsophila paniculata and GA3 treatment can effectively stimulate early flowering and suppress rosettes during winter.

Contributor Notes

Supported by the Science and Technology Program of Yunnan Province (No. 2016IA001) and the Key Research and Development (Agricultural field) Project of Yunnan Science and Technology Program (No. 2018BB010). We thank Dr. Shiyu Ma for assistance with the English language grammar and syntax of this manuscript.

Corresponding authors. E-mail: snruanjiwei@126.com or yangcmfri@foxmail.com.

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    Four commercial cultivars of Gypsophila paniculata were used in this study: (A) Gypsophila paniculata ‘My Pink’; (B) Gypsophila paniculata ‘Million Stars’; (C) Gypsophila paniculata ‘Cloudstar 8’; and (D) Gypsophila paniculata ‘Cloudstar 5’. Each cultivar refers to a different phenotype. Bar = 1 cm.

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    Effects of different planting seasons on the growth and development of Gypsophila paniculata. Statistical significance was analyzed based on a one-way analysis of variance. P was calculated with Tukey’s honestly significant difference post hoc test (α = 0.05).

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    Effects of different GA3 spray times on the growth of Gypsophila paniculata. Statistical significance was analyzed based on a one-way analysis of variance. P was calculated with Tukey’s honestly significant difference post hoc test (α = 0.05).

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