盐胁迫对花生幼苗离子动态及耐盐基因表达的影响

doi:10.3724/SP.J.1006.2023.24242

Abstract

Abstract:

Different peanut varieties have different salt tolerance. In this study, to determine the flow rates of ions Na⁺, K⁺, Ca²⁺, NH₄⁺, NO₃^-, and Cl^- in root tips of peanut seedlings under salt stress via Non-invasive Micro-test technique, a salt-tolerant peanut variety Huayu 25 (HY25) and a salt-sensitive variety Huayu 20 (HY20) were used as the experimental materials. The growth traits, the relative expression level of major salt tolerance genes, and the contents of osmotic regulatory substances (soluble sugar and proline) were also measured to establish the difference of ion absorption and stress resistance regulation in different varieties. The results showed as follows: (1) Under NaCl stress, Na⁺ influx was inhibited, and its efflux increased, but promoted the influx of K⁺. The efflux rate of Na⁺ and influx rate of K⁺ in HY25 were higher than HY20, which may improve salinity tolerance by preserving K⁺ and discharging Na⁺. (2) Salt stress promoted Ca²⁺ influx, and the Ca²⁺ influx rate of salt-tolerant varieties was higher than the salt-sensitive varieties, which might be related to salt tolerance. (3) NO₃^- exhibited efflux in both varieties under salt stress, but the efflux rate of the salt-tolerant variety HY25 was lower, indicating that HY25 could resist the harm of salt stress by slowing the loss of NO₃^-. (4) Salt stress induced Cl^- efflux in HY25 but influx in salt-sensitive variety, indicating that HY25 could reduce the toxicity of Cl^- by accelerating the efflux of Cl^-. (5) Salt stress significantly up-regulated the relative expression level of salt-tolerant genes AhNHX1, AhHA1, AhSAMDC1, and AhLeaD in salt-tolerant variety HY25, which could help improve its salt tolerance. Clarifying the dynamic changes of root ion flow and resistance mechanism under salt stress can provide the theoretical support for improving the emergence, establishment, and development of peanut seedlings in saline-alkali land and the establishment of regulation technology.

Key words: peanut, salt stress, dynamic ion, salt tolerance genes, non-invasive micro-test technique (NMT)

XU Yang, ZHANG Dai, KANG Tao, WEN Sai-Qun, ZHANG Guan-Chu, DING Hong, GUO Qing, QIN Fei-Fei, DAI Liang-Xiang, ZHANG Zhi-Meng. Effects of salt stress on ion dynamics and the relative expression level of salt tolerance genes in peanut seedlings[J].Acta Agronomica Sinica, 2023, 49(9): 2373-2384.

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	K⁺/Na⁺	Ca²⁺/Na⁺	NH₄⁺/Na⁺	NO₃^-/Na⁺	Cl^-/Na⁺
HY20CK	-0.00845	0.0115	0.0134	0.00119	-0.0107
HY20S	1.369	0.139	-0.0276	-0.0362	0.329
HY25CK	-0.683	0.0312	-0.0364	-0.00737	0.0307
HY25S	-6.108	-0.527	-0.254	0.0400	0.387

品种 Variety name	处理 Treatment	主根长 Primary root length	主茎高 Main shoot height	每株地下干重Underground dry weight per plant (g)	每株地上干重 Aboveground dry weight per plant (g)	根冠比 Root/shoot ratio
花育25 Huayu 25	CK	4.450±0.308 a	19.320±1.071 a	0.240±0.0163 a	1.640±0.0829 a	0.146±0.00303 a
花育25 Huayu 25	150 mmol L^-1 NaCl	2.553±0.244 b	12.470±0.474 b	0.130±0.00816 c	1.107±0.0946 c	0.119±0.00347 c
花育20 Huayu 20	CK	4.997±0.418 a	12.380±0.849 b	0.210±0.00817 b	1.433±0.184 b	0.148±0.0138 a
花育20 Huayu 20	150 mmol L^-1 NaCl	1.920±0.153 c	7.867±0.818 c	0.113±0.0125 d	0.820±0.0993 d	0.139±0.00984 b

Effects of salt stress on ion dynamics and the relative expression level of salt tolerance genes in peanut seedlings

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