草业学报 ›› 2025, Vol. 34 ›› Issue (2): 81-93.DOI: 10.11686/cyxb2024102
收稿日期:
2024-04-02
修回日期:
2024-05-08
出版日期:
2025-02-20
发布日期:
2024-11-27
通讯作者:
康文娟,师尚礼
作者简介:
shishl@gsau.edu.cn基金资助:
Yuan-yuan DU(), Wen-juan KANG(), Shang-li SHI(), Yi-lin HAN, Fu-qiang HE
Received:
2024-04-02
Revised:
2024-05-08
Online:
2025-02-20
Published:
2024-11-27
Contact:
Wen-juan KANG,Shang-li SHI
摘要:
紫花苜蓿根瘤的形成发育及幼苗生长受到多重植物激素的调控。激素对外源根瘤菌的增殖和促生效应已有研究,但激素对内生根瘤菌的增殖及促生效应研究较少。因此,筛选出对根瘤菌SM12531f生长有促进作用的3-吲哚乙酸、6-苄氨基嘌呤和28-高油菜素内酯的浓度,然后用这3种浓度分别浸泡含有青色荧光蛋白标记的内生根瘤菌SM12531f的苜蓿种子并种植,分析外源激素对苜蓿植株组织中内生根瘤菌数量、植株结瘤及植株生长的影响。结果表明,3-吲哚乙酸、6-苄氨基嘌呤和28-高油菜素内酯这3种激素的最适浓度分别为14 mg·L-1、18 mg·L-1和2.97 mg·L-1。幼苗期对植株内生根瘤菌增殖、结瘤及生长有益的是6-苄氨基嘌呤和28-高油菜素内酯,且前者的促进效果更明显,前者内生根瘤菌在根部的定殖数量最多,在稀释100倍时定殖数量为1167 cfu·g-1、地上鲜重为1.99 g·株-1。同样在分枝期对植株有益的是6-苄氨基嘌呤,且内生根瘤菌在根部研磨液稀释100倍时定殖数量为833 cfu·g-1、地上鲜重为5.03 g·株-1。因此,对苜蓿内生根瘤菌增殖及苜蓿生长最适的激素是18 mg·L-1的6-苄氨基嘌呤,该发现对精准利用种子内生根瘤菌的结瘤固氮效应提供理论依据,为紫花苜蓿-根瘤菌共生育种奠定了基础。
杜媛媛, 康文娟, 师尚礼, 韩宜霖, 何富强. 外源激素对紫花苜蓿种子内生根瘤菌增殖及幼苗生长的影响[J]. 草业学报, 2025, 34(2): 81-93.
Yuan-yuan DU, Wen-juan KANG, Shang-li SHI, Yi-lin HAN, Fu-qiang HE. Effects of exogenous hormones on the proliferation of endophytic fluorescent labeled rhizobia in seeds and growth of the seedlings[J]. Acta Prataculturae Sinica, 2025, 34(2): 81-93.
图1 3-吲哚乙酸处理对SM12531f增殖的影响图例为菌株名称+添加浓度,不同小写字母间表示差异显著(P<0.05),为同一检测时间的测定值(平均值±标准差),下同。The legend shows the name of the strain and the concentration added, the difference between different lowercase letters is significant (P<0.05), and the measured values at the same testing time (mean±standard deviation), the same below.
Fig.1 Effect of 3-indoleacetic acid treatment on the proliferation of SM12531f
图4 幼苗期苜蓿植株组织内标记内生根瘤菌数量不同小写字母表示同一菌株不同激素处理下差异显著(P<0.05),下同。The different lowercase letters indicate significant differences in the same strain under different hormone treatments (P<0.05), the same below.
Fig.4 Number of endophytic rhizobia labeled in alfalfa plant tissues at seedling stage
处理 Treatment | 地上鲜重 Aboveground fresh weight | 地上干重 Aboveground dry weight | 地下鲜重 Underground fresh weight | 地下干重 Underground dry weight |
---|---|---|---|---|
CK | 1.73±0.08ab | 0.23±0.00b | 0.83±0.01b | 0.06±0.00c |
3-IAA | 1.62±0.21b | 0.29±0.05ab | 0.68±0.01d | 0.06±0.00c |
6-BA | 1.99±0.23a | 0.31±0.02a | 0.73±0.01c | 0.07±0.01b |
HBR | 1.66±0.15ab | 0.29±0.03ab | 1.40±0.00a | 0.16±0.01a |
表1 幼苗期不同激素对苜蓿植株地上、地下干鲜重的影响
Table 1 The effect of different hormones on the aboveground and belowground dry and fresh weight of alfalfa plants during the seedling stage (g·plant-1)
处理 Treatment | 地上鲜重 Aboveground fresh weight | 地上干重 Aboveground dry weight | 地下鲜重 Underground fresh weight | 地下干重 Underground dry weight |
---|---|---|---|---|
CK | 1.73±0.08ab | 0.23±0.00b | 0.83±0.01b | 0.06±0.00c |
3-IAA | 1.62±0.21b | 0.29±0.05ab | 0.68±0.01d | 0.06±0.00c |
6-BA | 1.99±0.23a | 0.31±0.02a | 0.73±0.01c | 0.07±0.01b |
HBR | 1.66±0.15ab | 0.29±0.03ab | 1.40±0.00a | 0.16±0.01a |
处理 Treatment | 地上干重 Aboveground dry weight | 地上鲜重 Aboveground fresh weight | 地下鲜重 Underground fresh weight | 地下干重 Underground dry weight |
---|---|---|---|---|
CK | 0.80±0.09ab | 4.28±0.47ab | 2.33±1.00b | 0.36±0.13a |
3-IAA | 0.39±0.10c | 2.06±0.48c | 1.19±0.19c | 0.21±0.12a |
6-BA | 0.95±0.19a | 5.03±1.20a | 3.91±0.20a | 0.46±0.23a |
HBR | 0.51±0.20bc | 2.97±1.04bc | 2.19±0.14b | 0.29±0.12a |
表2 分枝期不同激素对苜蓿植株地上、地下干鲜重的影响
Table 2 Effects of different hormones during branching stage on dry and fresh weight of alfalfa plants above and below ground (g·plant-1)
处理 Treatment | 地上干重 Aboveground dry weight | 地上鲜重 Aboveground fresh weight | 地下鲜重 Underground fresh weight | 地下干重 Underground dry weight |
---|---|---|---|---|
CK | 0.80±0.09ab | 4.28±0.47ab | 2.33±1.00b | 0.36±0.13a |
3-IAA | 0.39±0.10c | 2.06±0.48c | 1.19±0.19c | 0.21±0.12a |
6-BA | 0.95±0.19a | 5.03±1.20a | 3.91±0.20a | 0.46±0.23a |
HBR | 0.51±0.20bc | 2.97±1.04bc | 2.19±0.14b | 0.29±0.12a |
处理 Treatment | 单株叶片数 Leaf number per plant | 株高 Plant height (cm) | 根长 Root length (cm) |
---|---|---|---|
CK | 16.00±2.00b | 31.66±2.15ab | 19.10±0.30a |
3-IAA | 19.00±1.73ab | 29.02±3.21b | 14.80±1.10b |
6-BA | 20.00±1.73a | 32.62±2.31a | 18.80±0.80a |
HBR | 19.33±1.53ab | 29.64±1.09ab | 18.50±0.70a |
表3 幼苗期不同激素对苜蓿植株单株叶片数、株高以及根长的影响
Table 3 Effects of different hormones at seedling stage on leaf number, plant height and root length of alfalfa plant
处理 Treatment | 单株叶片数 Leaf number per plant | 株高 Plant height (cm) | 根长 Root length (cm) |
---|---|---|---|
CK | 16.00±2.00b | 31.66±2.15ab | 19.10±0.30a |
3-IAA | 19.00±1.73ab | 29.02±3.21b | 14.80±1.10b |
6-BA | 20.00±1.73a | 32.62±2.31a | 18.80±0.80a |
HBR | 19.33±1.53ab | 29.64±1.09ab | 18.50±0.70a |
处理 Treatment | 单株叶片数 Leaf number per plant | 株高 Plant height (cm) | 根长 Root length (cm) |
---|---|---|---|
CK | 64.00±21.28a | 32.46±2.51a | 19.13±0.95a |
3-IAA | 33.67±5.13b | 35.04±2.05a | 19.23±3.02a |
6-BA | 53.33±9.24ab | 35.52±5.81a | 20.13±0.67a |
HBR | 62.67±2.08a | 34.10±3.90a | 20.20±3.45a |
表4 分枝期不同激素对苜蓿植株单株叶片数、株高以及根长的影响
Table 4 Effects of different hormones at branching stage on leaf number, plant height and root length of alfalfa plant
处理 Treatment | 单株叶片数 Leaf number per plant | 株高 Plant height (cm) | 根长 Root length (cm) |
---|---|---|---|
CK | 64.00±21.28a | 32.46±2.51a | 19.13±0.95a |
3-IAA | 33.67±5.13b | 35.04±2.05a | 19.23±3.02a |
6-BA | 53.33±9.24ab | 35.52±5.81a | 20.13±0.67a |
HBR | 62.67±2.08a | 34.10±3.90a | 20.20±3.45a |
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