Effects of Plant Growth Regulators on Passiflora edulia

doi:10.11924/j.issn.1000-6850.casb2021-0063

Abstract

Abstract:

The aim of this paper is to investigate the effect of plant growth regulators on Passiflora edulia nitrogen metabolism and defense system, and on their relationship with the fruit quality. We sprayed 2,4-dichlorophenoxyacetic acid (B) and amino-oligosaccharin (C) and 24- epbrassinolide (D) during the fruitlet period, fruit expanding period and coloring period, and measured the nitrogen metabolism related products and key enzyme activities, enzymatic defense system and non-enzymatic defense system related material, fruit appearance quality and intrinsic quality. The results showed that compared with control treatment (A), GS in the leaves of treatment B, C and D increased by 100.74%, 25.92% and 62.53%, respectively, and soluble protein content decreased by 54.19%, 47.26% and 10.11%, respectively. The contents of ascorbic acid (ASA) and glutathione (GSH) in treatment B were the highest, and the activities of catalase (CAT) and peroxidase (POD) increased by 31.99% and 79.44%, respectively. After treatment B, C and D, the soluble solids of Passiflora edulia fruits increased by 5.82%, 3.53% and 6.03%, and the organic acids increased by 4.87%, 8.97% and 10.58% compared with treatment A. In conclusion, the three plant growth regulators could affect fruit quality by affecting the enzymes activities and products related to nitrogen metabolism and defense system, and fruits treated by 24- ep-brassinolide have relatively high contents of soluble solids, organic acids, soluble sugars and Vc, and the best quality.

Key words: Passiflora edulia, plant growth regulators, nitrogen metabolism, defense system, fruit quality

CLC Number:

S667.9

Yang Qin, Yu Lu, Zhao Zhi, Chi Jiyan, Tan Shuming. Effects of Plant Growth Regulators on Passiflora edulia[J]. Chinese Agricultural Science Bulletin, 2021, 37(19): 58-64.

Figures/Tables 8

References 30

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处理	NR/(U/g)	GS/[U/(g·h)]	GPT/[μmol/(g·30 min)]	GOT/[μmol/(g·30 min)]
A	9.17±0.29a	0.451±0.017d	30.84±1.07a	21.49±0.37a
B	6.85±0.53b	0.906±0.007a	33.42±0.61a	21.15±0.34ab
C	6.71±0.67b	0.568±0.003c	26.15±0.36b	22.05±0.18a
D	6.45±0.82b	0.733±0.003b	31.29±1.01a	20.83±0.26b

处理	NR/(U/g)	GS/[U/(g·h)]	GPT/[μmol/(g·30 min)]	GOT/[μmol/(g·30 min)]
A	9.17±0.29a	0.451±0.017d	30.84±1.07a	21.49±0.37a
B	6.85±0.53b	0.906±0.007a	33.42±0.61a	21.15±0.34ab
C	6.71±0.67b	0.568±0.003c	26.15±0.36b	22.05±0.18a
D	6.45±0.82b	0.733±0.003b	31.29±1.01a	20.83±0.26b

处理	MDA含量/(μmol/g)	GSH含量/(mmol/g)	ASA含量/(mg/g)
A	6.47±1.4a	4.387±0.04a	521.26±21.44a
B	3.41±0.6b	4.395±0.26a	563.66±12.68a
C	6.35±1.13a	3.673±0.11b	433.15±8.97b
D	6.59±0.82a	3.970±0.06ab	549.83±32.32a

处理	MDA含量/(μmol/g)	GSH含量/(mmol/g)	ASA含量/(mg/g)
A	6.47±1.4a	4.387±0.04a	521.26±21.44a
B	3.41±0.6b	4.395±0.26a	563.66±12.68a
C	6.35±1.13a	3.673±0.11b	433.15±8.97b
D	6.59±0.82a	3.970±0.06ab	549.83±32.32a

处理	单果质量/g	纵径/mm	横径/mm	果形指数
A	50.89±11.5a	60.6±2.83a	55.53±2.54a	0.92±0.05a
B	51.3±10.21a	59.95±4.12a	54.67±3.88a	0.91±0.04a
C	54.12±12.58a	51.04±12.69a	50.89±11.5a	0.93±0.04a
D	51.04±12.69a	61.01±4.98a	57.31±4.2a	0.94±0.03a