多效唑对典型沙生植物羊柴幼苗生长的影响

doi:10.13866/j.azr.2025.10.11

Abstract

Abstract:

Paclobutrazol (PP₃₃₃) is a type of gibberellin inhibitor, which enhances the stress resistance of plants by regulating their growth and physiological processes. In this study, to explore the effect of PP₃₃₃ on the growth of Corethrodendron fruticosum seedlings under salt stress, the optimum concentration of PP₃₃₃ that improves the salt tolerance of C. fruticosum seedlings was first identified. C. fruticosum seedlings treated with 250 mmol·L^-1 NaCl (stress treatment) were irrigated with 0, 150, 300, 450, and 600 mg·L^-1 PP₃₃₃ using the pot method. The changes in seedling growth, photosynthetic characteristics, and stress resistance physiological indexes under each treatment were investigated and analyzed using the membership function method. The results showed that the growth in basal diameter and plant height of C. fruticosum seedlings were inhibited after salt stress. The net photosynthetic rate (P_n), transpiration rate (T_r), stomatal conductance (G_s), photosynthetic pigment content, and superoxide dismutase (SOD) activity decreased, whereas the intercellular CO₂ concentration (C_i), malondialdehyde (MDA) content, peroxidase (POD) activity, soluble sugar (Ss) content, and proline (Pro) content increased. Root irrigation with PP₃₃₃ effectively regulated the growth of C. fruticosum seedlings, alleviated the adverse effects of salt stress on seedling photosynthetic efficiency and antioxidant enzyme activity, and weakened the degree of membrane peroxidation. Comprehensive analysis showed that 600 mg·L^-1 PP₃₃₃ treatment enhanced the photosynthetic efficiency, antioxidant enzyme defense, and osmotic adjustment ability of C. fruticosum seedlings under salt stress, and effectively regulated growth, which helps the plants cope with salt stress.

Key words: Corethrodendron fruticosum seedlings, salt stress, paclobutrazol (PP₃₃₃), growth characteristics, physiological characteristics

YANG Rui, LIU Yang, DANG Xiaohong, MENG Zhongju, GAO Yong, GAO Qin. Effects of paclobutrazol on seedling growth of the typical psammophyte Corethrodendron fruticosum[J].Arid Zone Research, 2025, 42(10): 1876-1886.

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处理方式	基径生长量/mm	株高生长量/cm
CK	1.21±0.15a	4.12±0.43a
NP₀	0.38±0.07c	2.42±0.38b
NP₁₅₀	0.41±0.10c	2.08±0.28bc
NP₃₀₀	0.59±0.11b	1.82±0.22c
NP₄₅₀	0.64±0.06b	1.73±0.35c
NP₆₀₀	0.61±0.10b	1.69±0.25c

处理	指标
处理	基径生长量	株高生长量	P_n	T_r	G_s	C_i	Chla	Chlb	Car	Chl(a+b)	Chl(a/b)	MDA	SOD	POD	Ss	Pro	平均隶属函数值	排序
CK	1.00	0.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	0.90	0.00	0.00	0.81	1
NP₀	0.00	0.70	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.22	0.19	0.07	6
NP₁₅₀	0.04	0.84	0.06	0.08	0.05	0.24	0.12	0.03	0.03	0.09	0.37	0.02	0.42	0.62	0.62	0.43	0.25	5
NP₃₀₀	0.25	0.95	0.21	0.27	0.26	0.35	0.17	0.15	0.04	0.16	0.29	0.23	0.18	0.95	0.91	0.61	0.37	4
NP₄₅₀	0.31	0.98	0.26	0.41	0.30	0.25	0.23	0.18	0.21	0.21	0.44	0.23	0.54	0.81	1.00	1.00	0.46	3
NP₆₀₀	0.28	1.00	0.34	0.43	0.33	0.47	0.26	0.19	0.25	0.24	0.49	0.49	0.61	1.00	0.35	0.80	0.47	2

Effects of paclobutrazol on seedling growth of the typical psammophyte Corethrodendron fruticosum

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