Effect of Uniconazole on Growth, Seed Yield and Quality of Prairie Grass

doi:10.11924/j.issn.1000-6850.casb2023-0238

Abstract

Abstract:

The effect of uniconazole on plant growth, seed yield and quality of prairie grass was explored in order to provide a scientific basis for the seed yield and quality improvement. The plant growth, seed yield and germination characteristics of prairie grass ‘Jiangxia’ were studied by spraying different concentrations of uniconazole (0 mg/kg, 50 mg/kg, 90 mg/kg and 130 mg/kg) at jointing stage in a random block design. The results showed that uniconazole reduced plant height and increased lodging resistance. Except that 50 mg/kg uniconazole significantly increased the reproductive branch number (P<0.05), other treatments had no significant effects on the second stem node length, stem diameter, tiller number of plants and reproductive branch number. The spikelet number/reproductive branch, seed number and yield of prairie grass were increased by spraying different concentrations of uniconazole, but the difference of the all indexes was significant only under 50 mg/kg treatment (P<0.05). 90 mg/kg uniconazole treatment significantly increased seed vigor index (P<0.05), but all treatments had little effect on 1000-seed weight, germination rate and germination index. Correlation analysis showed that plant height was positively correlated with lodging rate, tillers number and reproductive branch number (P<0.01). And seed yield was positively correlated with reproductive branch number (P<0.05). The highest seed yield of prairie grass was 1508.31 kg/hm² when 50 mg/kg uniconazole was sprayed, which was 13.63% higher than that of the control and the difference was significant (P<0.05).

Key words: prairie grass, uniconazole, agronomic traits, seed yield, germination characteristics

TIAN Hong, LU Jiaoyun, ZHANG Heshan, XIONG Junbo, LIU Yang. Effect of Uniconazole on Growth, Seed Yield and Quality of Prairie Grass[J]. Chinese Agricultural Science Bulletin, 2024, 40(6): 29-35.

Figures/Tables 4

References 38

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烯效唑浓度/(mg/kg)	株高/cm	节长/cm	茎粗/mm	倒伏率/%	分蘖数/（个/m²）	生殖枝数/（个/m²）
0	110.00±0.82a	3.93±0.53ab	3.14±0.50a	90.67±1.64a	297.33±19.10a	205.14±15.21b
50	105.93±6.98a	4.31±0.20a	3.24±0.57a	42.33±1.88b	313.78±9.85a	225.71±16.12a
90	93.57±5.77b	4.18±0.33a	3.08±0.32a	30.67±0.43c	321.33±15.90a	210.29±11.53ab
130	90.90±2.29b	3.26±0.06b	3.00±0.33a	0.00±0.72d	303.56±7.18a	198.86±10.08b

烯效唑浓度/(mg/kg)	株高/cm	节长/cm	茎粗/mm	倒伏率/%	分蘖数/（个/m²）	生殖枝数/（个/m²）
0	110.00±0.82a	3.93±0.53ab	3.14±0.50a	90.67±1.64a	297.33±19.10a	205.14±15.21b
50	105.93±6.98a	4.31±0.20a	3.24±0.57a	42.33±1.88b	313.78±9.85a	225.71±16.12a
90	93.57±5.77b	4.18±0.33a	3.08±0.32a	30.67±0.43c	321.33±15.90a	210.29±11.53ab
130	90.90±2.29b	3.26±0.06b	3.00±0.33a	0.00±0.72d	303.56±7.18a	198.86±10.08b

烯效唑浓度/ (mg/kg)	小穗/生殖枝/个	种子/小穗/个	种子数/ （个/m²）	千粒重/ g	种子长/ mm	种子宽/ mm	种子厚/ mm	种子产量/ (kg/hm²)
0	18.32±0.61c	3.03±0.24b	10941.71±2396.19b	10.51±0.32ab	17.45±1.27a	1.96±0.26b	1.35±0.26a	1327.33±22.11b
50	22.71±1.00a	3.03±0.23b	15021.14±2761.97a	10.35±0.32b	17.38±1.31a	2.24±0.21a	1.27±0.14a	1508.31±70.24a
90	21.08±1.08ab	3.38±0.40a	14502.29±1658.09a	10.58±0.37ab	17.15±0.98a	2.20±0.23a	1.25±0.12a	1386.92±39.36ab
130	19.74±1.47bc	3.47±0.59a	12791.43±2428.53ab	10.67±0.24a	17.30±1.31a	2.16±0.24a	1.33±0.16a	1453.26±101.10ab

烯效唑浓度/ (mg/kg)	小穗/生殖枝/个	种子/小穗/个	种子数/ （个/m²）	千粒重/ g	种子长/ mm	种子宽/ mm	种子厚/ mm	种子产量/ (kg/hm²)
0	18.32±0.61c	3.03±0.24b	10941.71±2396.19b	10.51±0.32ab	17.45±1.27a	1.96±0.26b	1.35±0.26a	1327.33±22.11b
50	22.71±1.00a	3.03±0.23b	15021.14±2761.97a	10.35±0.32b	17.38±1.31a	2.24±0.21a	1.27±0.14a	1508.31±70.24a
90	21.08±1.08ab	3.38±0.40a	14502.29±1658.09a	10.58±0.37ab	17.15±0.98a	2.20±0.23a	1.25±0.12a	1386.92±39.36ab
130	19.74±1.47bc	3.47±0.59a	12791.43±2428.53ab	10.67±0.24a	17.30±1.31a	2.16±0.24a	1.33±0.16a	1453.26±101.10ab

烯效唑浓度/(mg/kg)	发芽率/%	发芽指数	胚芽长/cm	胚根长/cm	活力指数
0	88.12±5.09a	149.54±5.08a	5.32±0.70b	6.60±0.95a	1785.22±63.96b
50	90.00±3.46a	151.62±3.00a	5.29±0.83b	5.90±0.72b	1694.06±120.28b
90	87.17±3.01a	150.75±0.50a	6.11±0.90a	6.86±0.87a	1958.35±55.79a
130	90.72±4.50a	150.31±1.33a	4.86±0.61b	5.97±0.55b	1632.66±19.73b