Sciences in Cold and Arid Regions ›› 2019, Vol. 11 ›› Issue (4): 327-334.doi: 10.3724/SP.J.1226.2019.00327.

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Effects of gibberellic acid on tiller-bulb number and growth performance of Lilium davidii var. unicolor

YuHui He(),ZhongKui Xie,XinPing Liu,YaJun Wang,YuBao Zhang,Yang Qiu   

  1. Department of Ecology and Agriculture, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
  • Received:2019-03-13 Accepted:2019-04-12 Online:2019-08-31 Published:2019-09-02
  • Contact: YuHui He E-mail:ahuihyh@lzb.ac.cn

Abstract:

Lilium davidii var. unicolor (Lanzhou lily) is an important economic crop in the northwest cold and arid regions of China. Effective regulation of tiller-bulb development and plant growth is the key to improving yield and quality of the lily. This study attempted to evaluate the effect of gibberellic acid (GA3) on tiller-bulb development and plant growth of Lanzhou lily by applying GA3 at various concentrations (0 mg/L, 10 mg/L, 30 mg/L, 60 mg/L, and 100 mg/L) before planting and in the seedling period. Results showed that the 60-mg/L GA3 application had an inhibiting effect on tiller-bulb formation and increased the ratios of single and double bulbs but decreased the ratios of bulbs with three or more tiller bulbs, as compared to the control (CK) and other GA3 treatments. The difference in flower number did not reach significant levels among the treatments. The tillering-related endogenous hormones IAA (indole-3-acetic acid) and Z (zeatin) content decreased, while IAA/Z increased with the 60-mg/L GA3 treatment during tiller initiation. And also, the shoot-bulb number and total daughter-bulb number decreased significantly with the 60-mg/L GA3 treatment. Furthermore, the 10-mg/L GA3 application promoted growth of Lanzhou lily significantly and resulted in an increase in plant height; bulb diameter; bulb circumference; and biomass of shoots, bulbs, fibrous roots, and the whole plant. Therefore, GA3 application is promising as a new regulation method for inhibiting tiller-bulb development and promoting bulb growth in Lanzhou lily production.

Key words: Gibberellic acid, tiller bulb, endogenous hormone content, height, biomass

Figure 1

Tiller-bulb and flower numbers of Lanzhou lily at different GA3-application treatments"

Figure 2

Bulb ratios in different grades at different GA3-application treatments"

Figure 3

IAA and Z contents in buds at different GA3 treatments"

Figure 4

Plant height, basal shoot diameter, bulb diameter, and bulb circumference of Lanzhou lily at different GA3 treatments"

Table 1

Different organ biomasses (g) of Lanzhou lily per plant at different GA3-application treatments"

Treatments Shoots Leaves Shoot bulbs Bulbs Fleshy roots Fibrous roots
CK 0.77±0.08 a 0.95±0.10 a 0.15±0.08 ab 5.49±0.30 a 0.26±0.05 a 0.07±0.01 a
M1 1.16±0.16 b 1.13±0.06 a 0.19±0.03 ab 7.19±0.44 b 0.37±0.03 a 0.14±0.04 b
M3 0.83±0.05 a 1.03±0.07 a 0.24±0.02 a 6.09±0.66 ab 0.29±0.03 a 0.10±0.01 ab
M6 1.00±0.10 ab 0.95±0.20 a 0.07±0.03 b 6.37±0.66 ab 0.34±0.07 a 0.12±0.00 ab
M10 0.87±0.10 ab 1.07±0.07 a 0.21±0.05 ab 6.28±0.13 ab 0.35±0.08 a 0.07±0.01 a

Table 2

Biomass allocation (g) of Lanzhou lily per plant at different GA3-application treatments"

Treatments Aboveground biomass Scale biomass Root biomass Whole biomass
CK 1.73±0.17 a 5.64±0.33 a 0.33±0.06 a 7.70±0.49 a
M1 2.29±0.21 a 7.38±0.43 b 0.50±0.06 a 10.18±0.69 b
M3 1.87±0.12 a 6.33±0.68 ab 0.40±0.04 a 8.60±0.81 ab
M6 1.94±0.30 a 6.61±0.67 ab 0.46±0.06 a 8.85±1.01 ab
M10 1.94±0.16 a 6.48±0.08 ab 0.42±0.08 a 8.85±0.29 ab

Table 3

Correlation of bulb quality and other growth characteristics under GA3 application"

BB BC BD TBN PH BSD SB LB AGB RB
BB 1
BC 0.634* 1
BD 0.640* 0.758** 1
TBN -0.017 -0.574* -0.15 1
PH 0.677** 0.697** 0.752** -0.213 1
BSD 0.603* 0.681** 0.652** -0.180 0.859** 1
SB 0.804** 0.395 0.605* 0.084 0.744** 0.662** 1
LB 0.797** 0.335 0.290 0.150 0.267 0.403 0.633* 1
AGB 0.885** 0.406 0.508 0.126 0.578* 0.599* 0.918** 0.888** 1
RB 0.667** 0.440 0.558* -0.127 0.661** 0.631* 0.761** 0.543* 0.730** 1
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