Exogenous Active Substances: Effect on Stress Resistance of Wheat Seedling

doi:10.11924/j.issn.1000-6850.casb2021-0871

Abstract

Abstract:

The aim is to investigate the effect of exogenous active substances on salt tolerance of wheat. The effects of Asp f2 protein solution of Verticillium dahliae (0.8%, VDAL), algal oligosaccharides (0.1%, AOS) and distilled water (CK) seed dressing on the growth and stress-resistance physiology of wheat seedlings were analyzed with saline-alkali soil pot experiment. The results showed that compared with CK, VDAL and AOS seed dressing significantly increased plant height, root dry weight and leaf dry weight at seedling stage, and the root shoot ratio increased by 8.5% and 6.8%, respectively. AOS seed dressing significantly increased the contents of chlorophyll a, chlorophyll a+b and carotenoid in leaves. VDAL and AOS seed dressing could significantly reduce malondialdehyde content in leaves. VDAL seed dressing could significantly increase soluble sugar and proline content in leaves, and increase peroxidase (POD) activity in leaves by 29.5%. AOS seed dressing could significantly increase proline content and POD activity. In conclusion, both VDAL and AOS seed dressing could promote the salt tolerance of wheat seedling, and be applied to wheat cultivation in saline-alkali land to increase the population size of wheat.

Key words: wheat, exogenous active substances, saline-alkali stress, algal oligosaccharides, salt tolerance

CLC Number:

S512.1+1

WU Di, ZHANG Feng, SUI Chunying, SHI Junhui, WAN Xuejie, LIU Yiguo, HAN Wei, SHI Changhai. Exogenous Active Substances: Effect on Stress Resistance of Wheat Seedling[J]. Chinese Agricultural Science Bulletin, 2022, 38(9): 14-19.

Figures/Tables 5

References 29

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处理	株高/cm	叶干重/(g/plant)	根干重/(g/plant)	根冠比
CK	16.2b	0.33b	0.25 b	0.74 b
VDAL	20.1a	0.45a	0.36 a	0.80 a
AOS	19.7a	0.47a	0.37 a	0.79 a

处理	株高/cm	叶干重/(g/plant)	根干重/(g/plant)	根冠比
CK	16.2b	0.33b	0.25 b	0.74 b
VDAL	20.1a	0.45a	0.36 a	0.80 a
AOS	19.7a	0.47a	0.37 a	0.79 a

处理	叶绿素a/ (mg/g)	叶绿素b/ (mg/g)	叶绿素a+b/ (mg/g)	叶绿素a/b	类胡萝卜素/ (mg/g)
CK	25.24b	8.80a	34.04b	2.96a	5.79b
VDAL	26.11b	8.76a	34.87b	3.03a	6.20ab
AOS	39.34a	9.66a	39.02a	3.05a	7.71a

处理	叶绿素a/ (mg/g)	叶绿素b/ (mg/g)	叶绿素a+b/ (mg/g)	叶绿素a/b	类胡萝卜素/ (mg/g)
CK	25.24b	8.80a	34.04b	2.96a	5.79b
VDAL	26.11b	8.76a	34.87b	3.03a	6.20ab
AOS	39.34a	9.66a	39.02a	3.05a	7.71a