Influences of Plant Growth Regulators on Fruit Quality of ‘Summer Black’ Grape Under Labor-Saving Pruning of New Shoots

doi:10.11924/j.issn.1000-6850.casb2025-0206

Abstract

Abstract:

To study the changes in fruit quality of ‘Summer Black’ grapes under the treatments of labor-saving pruning of new shoots and commonly used plant growth regulators, the experiment involved dipping the ‘Summer Black’ grape clusters in 9 reagents, including 4 plant growth regulators (PGR) of gibberellin (GA3), forchlorfenuron (CPPU), thidiazuron (TDZ), streptomycin (SM) and their combinations in different proportions after pruning with labor-saving pruning techniques. The appearance quality indexes of grape berries during the maturing and harvesting period (including single-berry weight, longitudinal diameter, transverse diameter, and fruit shape index) were detected and analyzed. At the same time, the internal physicochemical properties of the fruits were measured, with a focus on evaluating core indicators such as soluble solids and titratable acid content, and calculating the solid-acid ratio. Correlation analysis and principal component analysis were used to comprehensively evaluate the fruit quality of ‘Summer Black’ grapes. The results showed that the PGR ratio was 25 mg/L GA₃+ 2.5 mg/L TDZ+ 100 mg/L SM, the key quality aspects such as fruit size and sweetness were outstanding. Secondly, the PGR combination with a ratio of 25 mg/L GA₃+ 5 mg/L CPPU+ 2.5 mg/L TDZ+ 200 mg/L SM also had a significant effect on improving fruit quality. These two treatment ratio combinations have great promotion value in practical production and are expected to help improve the overall quality and economic benefits of ‘Summer Black’ grapes.

Key words: plant growth regulators, grape, main shoot, lateral shoot, pinching, removal, labor-saving pruning

TANG Zhongjian, ZHANG Jinzhi, WANG Xiaomei, JIANG Zheng, DAI Zhixin, WANG Xiaoping, TAN Yupeng, FAN Wenjuan, ZHANG Lianjie. Influences of Plant Growth Regulators on Fruit Quality of ‘Summer Black’ Grape Under Labor-Saving Pruning of New Shoots[J]. Chinese Agricultural Science Bulletin, 2025, 41(30): 46-51.

Figures/Tables 5

References 25

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处理	穗粒重/g	纵径/mm	横径/mm	果形指数
CK	9.03±1.43b	33.35±1.98a	24.97±2.04b	1.34±0.02a
A	9.12±1.06b	30.94±1.98a	26.27±1.54ab	1.19±0.05c
B	10.73±0.99ab	33.29±1.69a	27.79±1.62a	1.21±0.05b
C	10.43±1.78ab	32.19±1.78a	28.03±2.11a	1.16±0.03c
D	10.38±1.58ab	32.28±2.08a	27.78±1.67a	1.17±0.02c
E	10.74±1.66ab	32.34±2.33a	28.35±2.27a	1.15±0.03c
F	11.48±1.62a	33.01±1.96a	28.44±1.95a	1.17±0.02c
G	10.24±1.35ab	33.15±1.74a	26.71±1.94ab	1.25±0.04b
H	11.42±2.02a	32.94±2.58a	28.13±2.12a	1.18±0.03c

处理	穗粒重/g	纵径/mm	横径/mm	果形指数
CK	9.03±1.43b	33.35±1.98a	24.97±2.04b	1.34±0.02a
A	9.12±1.06b	30.94±1.98a	26.27±1.54ab	1.19±0.05c
B	10.73±0.99ab	33.29±1.69a	27.79±1.62a	1.21±0.05b
C	10.43±1.78ab	32.19±1.78a	28.03±2.11a	1.16±0.03c
D	10.38±1.58ab	32.28±2.08a	27.78±1.67a	1.17±0.02c
E	10.74±1.66ab	32.34±2.33a	28.35±2.27a	1.15±0.03c
F	11.48±1.62a	33.01±1.96a	28.44±1.95a	1.17±0.02c
G	10.24±1.35ab	33.15±1.74a	26.71±1.94ab	1.25±0.04b
H	11.42±2.02a	32.94±2.58a	28.13±2.12a	1.18±0.03c

处理	可溶性固形物含量/%	可滴定酸含量/%	果实固酸比	可溶性糖含量/%
CK	16.81±1.22a	0.45±0.04a	38.01±5.06b	8.21±0.84b
A	16.98±0.73a	0.41±0.07ab	42.16±4.64ab	5.63±0.54e
B	15.68±2.04a	0.34±0.05ab	47.55±2.43ab	6.64±0.65cde
C	15.44±2.22a	0.37±0.09ab	42.05±6.09ab	6.93±0.45bcde
D	16.21±2.25a	0.41±0.07ab	40.18±10.78b	6.04±0.58de
E	18.01±1.57a	0.36±0.05ab	50.71±10.48ab	6.31±0.08cde
F	17.94±1.17a	0.31±0.02b	58.58±4.84a	7.28±0.32bcd
G	18.11±1.46a	0.38±0.05ab	47.89±6.06ab	9.45±0.91a
H	17.68±1.10a	0.38±0.05ab	46.66±7.72ab	7.51±0.39bc

处理	可溶性固形物含量/%	可滴定酸含量/%	果实固酸比	可溶性糖含量/%
CK	16.81±1.22a	0.45±0.04a	38.01±5.06b	8.21±0.84b
A	16.98±0.73a	0.41±0.07ab	42.16±4.64ab	5.63±0.54e
B	15.68±2.04a	0.34±0.05ab	47.55±2.43ab	6.64±0.65cde
C	15.44±2.22a	0.37±0.09ab	42.05±6.09ab	6.93±0.45bcde
D	16.21±2.25a	0.41±0.07ab	40.18±10.78b	6.04±0.58de
E	18.01±1.57a	0.36±0.05ab	50.71±10.48ab	6.31±0.08cde
F	17.94±1.17a	0.31±0.02b	58.58±4.84a	7.28±0.32bcd
G	18.11±1.46a	0.38±0.05ab	47.89±6.06ab	9.45±0.91a
H	17.68±1.10a	0.38±0.05ab	46.66±7.72ab	7.51±0.39bc

	果实无核率	穗粒重	纵径	横径	果形指数	果实可溶性固形物含量	果实可滴定酸含量	果实固酸比	果实可溶性糖含量
无核率	1
穗粒重	-0.671^*	1
纵径	-0.213	0.364	1
横径	-0.462	0.897^**	-0.003	1
果形指数	0.324	-0.621	0.477	-0.878^**	1
可溶性固形物含量	-0.433	0.235	0.131	0.035	0.017	1
可滴定酸含量	0.518	-0.774^*	-0.203	-0.771^*	0.586	-0.105	1
果实固酸比	-0.648	0.774^*	0.264	0.618	-0.428	0.572	-0.868^**	1
可溶性糖含量	-0.148	0.734^*	0.702^*	-0.331	0.608	0.388	0. 123	0.104	1