丛枝菌根真菌与氮添加对不同根形态基因型水稻氮吸收的影响

doi:10.17521/cjpe.2021.0155

植物生态学报 ›› 2021, Vol. 45 ›› Issue (7): 728-737.DOI: 10.17521/cjpe.2021.0155

所属专题：生态化学计量；根系生态学；菌根真菌

丛枝菌根真菌与氮添加对不同根形态基因型水稻氮吸收的影响

马炬峰¹^,², 辛敏¹^,², 徐陈超¹^,², 祝琬莹¹^,², 毛传澡², 陈欣², 程磊¹^,²^,^*()

¹浙江大学生命系统稳态与保护教育部重点实验室, 杭州 310058
²浙江大学生命科学学院, 杭州 310058

收稿日期:2021-04-22 接受日期:2021-05-20 出版日期:2021-07-20 发布日期:2021-10-22
通讯作者: 程磊
作者简介:* lcheng@zju.edu.cn
基金资助:
国家自然科学基金(91951107);国家自然科学基金(32025024);中央高校基本科研基金(K20200026)

Effects of arbuscular mycorrhizal fungi and nitrogen addition on nitrogen uptake of rice genotypes with different root morphologies

MA Ju-Feng¹^,², XIN Min¹^,², XU Chen-Chao¹^,², ZHU Wan-Ying¹^,², MAO Chuan-Zao², CHEN Xin², CHENG Lei¹^,²^,^*()

¹MOE Key Laboratory of Biosystems Homeostasis & Protection, Zhejiang University, Hangzhou 310058, China
²College of Life Sciences, Zhejiang University, Hangzhou 310058, China

Received:2021-04-22 Accepted:2021-05-20 Online:2021-07-20 Published:2021-10-22
Contact: CHENG Lei
Supported by:
National Natural Science Foundation of China(91951107);National Natural Science Foundation of China(32025024);Fundamental Research Funds for the Central Universities(K20200026)

摘要/Abstract

摘要：

植物主要依赖自身根系从土壤中获取矿质养分; 具有不同根形态的植物对于养分的吸收能力存在差异。丛枝菌根真菌(AMF)能与陆地植物根系形成共生关系, 帮助植物吸收矿质养分。但是, AMF对于植物根系养分吸收的促进效应是否会受根形态的影响还鲜有研究。该研究选取4种不同根形态基因型水稻(根毛缺陷突变体rhl1、侧根缺陷突变体iaa11、不定根缺失突变体arl1和野生型Kas)为研究对象, 设置2种施氮水平处理(低氮: 20 mg·kg^-1氨氮; 高氮: 100 mg·kg^-1氨氮), 利用稳定同位素¹⁵N示踪标记技术, 探究AMF和氮添加对不同根形态植物氮吸收的影响。研究结果发现, 相比低氮处理, 高氮处理下, rhl1、Kas、iaa11与arl1的茎叶¹⁵N浓度分别提高了60%、72%、128%与118%, 说明氮添加显著促进了水稻氮吸收, 且iaa11与arl1对氮添加的响应更强烈。在低氮水平下, AMF对rhl1、Kas、iaa11与arl1氮吸收的平均效应值分别为17%、31%、42%、51%, 表明AMF对于植物氮吸收的促进效应受根形态影响, iaa11与arl1对AMF的响应明显高于Kas与rhl1; 相较于低氮水平, 高氮水平下AMF对于不同根形态水稻氮吸收的促进效应都会显著降低, 表明氮添加削弱了AMF对植物氮吸收的促进效应。该研究阐明了4种不同根形态基因型水稻氮养分吸收存在显著差异, 其中氮吸收能力较弱的基因型水稻对AMF的响应更强, 该结果补充了植物与AMF在养分吸收上存在功能互补的控制实验证据。

关键词: 丛枝菌根真菌, 氮添加, 根形态, 氮吸收, 功能互补

Abstract:

Aims Plants absorb mineral nutrients such as nitrogen (N) mainly through their roots. The nutrient uptake of plants with different root morphologies differs. Many studies have shown that arbuscular mycorrhizal fungi (AMF) can help their symbiotic associates absorb mineral N. However, there is little research on whether the effect of AMF on nutrient uptake of plant roots is affected by root morphology.

Methods In this study, we selected three rice mutants and one wild type (root hairless (rhl1), lateral rootless (iaa11), adventitious rootless (arl1) and wild type (Kas)) to investigate the role of root morphology in plant nutrient uptake. Subsequently, we used the ¹⁵N isotope labeling method to explore the effects of arbuscular mycorrhizal fungi and N addition (low N: 20 mg·kg^-1 NH₄⁺-N; high N: 100 mg·kg^-1 NH₄⁺-N) on N uptake of rice mutants with different root morphologies.

Important findings The results show that the leaf ¹⁵N concentrations of rhl1,Kas, iaa11 and arl1 were increased by 60%, 72%, 128% and 118%, respectively, under the high N compared to the low N treatment. This result indicates that the addition of N significantly promoted rice N uptake with the most evident effect occurring in iaa11 and arl1. The average effect sizes of AMF on rhl1, Kas, iaa11 and arl1 were 17%, 31%, 42% and 51% under the low N level, indicating that root morphology can alter the effect of AMF on plant N uptake. Compared to the low N treatment, high N significantly downregulated the AMF effect on N uptake by rice plants with different root morphologies, indicating that N addition may mediate the complementary effect of AMF and root morphology on plant nutrient uptake. In conclusion, our data provide direct experimental evidence of funcitonal complementarity of mycrrohzal fungi and their associated roots with different root morphogy.

Key words: arbuscular mycorrhizal fungi, nitrogen addition, root morphology, nitrogen uptake, functional complementarity

马炬峰, 辛敏, 徐陈超, 祝琬莹, 毛传澡, 陈欣, 程磊. 丛枝菌根真菌与氮添加对不同根形态基因型水稻氮吸收的影响. 植物生态学报, 2021, 45(7): 728-737. DOI: 10.17521/cjpe.2021.0155

MA Ju-Feng, XIN Min, XU Chen-Chao, ZHU Wan-Ying, MAO Chuan-Zao, CHEN Xin, CHENG Lei. Effects of arbuscular mycorrhizal fungi and nitrogen addition on nitrogen uptake of rice genotypes with different root morphologies. Chinese Journal of Plant Ecology, 2021, 45(7): 728-737. DOI: 10.17521/cjpe.2021.0155

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2021.0155

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图/表 6

图1 不同根形态基因型水稻根系扫描图。材料来自种植7周的水稻。arl1, 不定根缺失突变体水稻; iaa11, 侧根缺陷型突变体水稻; Kas, 野生型水稻; rhl1, 根毛缺陷型突变体水稻。

Fig. 1 Root scanning images of rice with different genotypes. The material was obtained from rice was planted for 7 weeks. arl1, adventitious rootless mutant; iaa11, lateral rootless mutant; Kas, wild type; rhl1, root hairless mutant.

图2 不同根形态基因型水稻根系不定根数目、平均根径、总根长和根尖数(平均值±标准误, n = 10)。arl1, 不定根缺失突变体水稻; iaa11, 侧根缺陷型突变体水稻; Kas, 野生型水稻; rhl1, 根毛缺陷型突变体水稻。柱形图上方不同小写字母表示处理间差异显著(p < 0.05)。

Fig. 2 Number of adventitious roots, root diameter, root length and root tips of rice with different genotypes (mean ± SE, n = 10). arl1, adventitious rootless mutant; iaa11, lateral rootless mutant; Kas, wild type; rhl1, root hairless mutant. Different lowercase letters above the columns represent significant differences between treatments according to least significant difference test (p < 0.05).

图3 不同氮处理对不同根形态基因型水稻地上部分15N浓度的影响(平均值±标准误, n = 5)。arl1, 不定根缺失突变体水稻; iaa11, 侧根缺陷型突变体水稻; Kas, 野生型水稻; rhl1, 根毛缺陷型突变体水稻。柱形图上方不同小写字母表示处理间差异显著( p < 0.05)。neu, 氮处理效应; st, 基因型效应; neu × st, 氮处理与基因型交互效应。ns, 没有显著差异; *, p < 0.05; ***, p < 0.001。

Fig. 3 Effect of different nitrogen treatments on 15N concentrations of rice shoots with different genotypes (mean ± SE, n = 10). arl1, adventitious rootless mutant; iaa11, lateral rootless mutant; Kas, wild type; rhl1, root hairless mutant. Different lowercase letters above the columns represent significant differences between treatments according to least significant difference test (p < 0.05). neu, nitrogen treatment effect; st, genotype effect; neu × st, interaction effect between nitrogen treatment and genotype. ns, not significant; *, p < 0.05; ***, p < 0.001.

表1 不同氮养分条件下不同基因型水稻菌根侵染率(平均值±标准误, n = 5)

Table 1 Mycorrhizal colonization rate of rice with different genotypes under different nitrogen nutrient conditions (mean ± SE, n = 5)

氮处理 Nitrogen treatment	AMF处理 AMF treatment	菌根侵染率 Mycorrhizal colonization rate (%)
氮处理 Nitrogen treatment	AMF处理 AMF treatment	Kas	rhl1	iaa11	arl1
低氮 Low nitrogen	Non-AMF	0	0	0	0
低氮 Low nitrogen	AMF	40 ± 4^b	50 ± 2^ab	62 ± 4^a	43 ± 1^b
高氮 High nitrogen	Non-AMF	0	0	0	0
高氮 High nitrogen	AMF	45 ± 3^ab	49 ± 3^ab	55 ± 4^a	40 ± 3^b

图4 不同氮处理下菌根真菌(AMF)处理对不同基因型水稻氮吸收的影响(平均值±标准误, n = 5)。柱形图上方不同小写字母表示处理间差异显著(p < 0.05)。amf, AMF处理效应; st, 基因型效应; amf × st, AMF处理与基因型交互效应。ns, 没有显著差异; *, p < 0.05, ***, p < 0.001。

Fig. 4 Effect of arbuscular mycorrhizal fungi (AMF) on nitrogen uptake in rice with different genotypes under different nitrogen treatments (mean ± SE, n = 5). Different lowercase letters above the columns represent significant differences between treatments according to least significant difference test (p < 0.05). amf, AMF treatment effect; st, genotype effect; amf × st, interaction effect between AMF treatment and genotype, there was no significant difference. ns, not significant; *, p < 0.05; ***, p < 0.001.

图5 不同氮处理下菌根真菌(AMF)处理对不同基因型水稻氮吸收的平均效应值(平均值±标准误, n = 5)。平均效应值: AMF处理下地上部分15N浓度变化百分量。柱形图上方不同小写字母表示处理间差异显著(p < 0.05)。neu, 氮处理效应; st, 基因型效应; neu × st, 氮处理与基因型交互效应。ns, 没有显著差异; **, p < 0.01, ***, p < 0.001。

Fig. 5 Effect size of arbuscular mycorrhizal fungi (AMF) treatment on nitrogen uptake in rice with different genotypes under different nitrogen treatments (mean ± SE, n = 5). Effect size: proportion of change of 15N concentration of rice shoots by AMF treatment. Different lowercase letters above the columns represent significant differences between treatments according to least significant difference test (p < 0.05). neu, nitrogen treatment effect; st, genotype effect; neu × st, interaction effect between nitrogen treatment and genotype, there was no significant difference. ns, not significant; **, p < 0.01; ***, p < 0.001.

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丛枝菌根真菌与氮添加对不同根形态基因型水稻氮吸收的影响

Effects of arbuscular mycorrhizal fungi and nitrogen addition on nitrogen uptake of rice genotypes with different root morphologies

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