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

摘要/Abstract

摘要：

多效唑（PP₃₃₃）是一种赤霉素抑制剂，能够通过调控植物的生长、生理过程，使其抗逆性得到增强。为探究盐胁迫下外施PP₃₃₃对羊柴幼苗生长的影响，筛选出PP₃₃₃提高羊柴耐盐性的最适浓度。本文以羊柴幼苗为材料，采用盆栽法，在250 mmol·L^-1 NaCl胁迫处理后，将0、150、300、450、600 mg·L^-1的PP₃₃₃分别灌根入土，分析各处理下幼苗生长、光合特性、抗逆生理指标的变化情况，采用隶属函数法进行评价。结果表明：盐胁迫后羊柴幼苗的基径生长量、株高生长量被抑制；净光合速率（P_n）、蒸腾速率（T_r）、气孔导度(G_s)、光合色素含量、超氧化物歧化酶（SOD）活性降低；胞间CO₂浓度（C_i）、丙二醛（MDA）含量、过氧化物酶（POD）活性、可溶性糖（Ss）含量和脯氨酸（Pro）含量升高；灌根PP₃₃₃可有效调控羊柴幼苗生长，缓解盐胁迫对幼苗光合效率、抗氧化酶活性的不利影响，减弱膜质过氧化程度。综合分析表明：600 mg·L^-1 PP₃₃₃处理能够增强盐胁迫下羊柴幼苗光合效率、抗氧化酶防御和渗透调节能力，有效调控生长来应对盐胁迫。

关键词: 羊柴幼苗, 盐胁迫, 多效唑（PP₃₃₃）, 生长特征, 生理特征

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

杨蕊, 刘阳, 党晓宏, 蒙仲举, 高永, 高琴. 多效唑对典型沙生植物羊柴幼苗生长的影响[J]. 干旱区研究, 2025, 42(10): 1876-1886.

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