中国农业科学 ›› 2021, Vol. 54 ›› Issue (3): 629-642.doi: 10.3864/j.issn.0578-1752.2021.03.016

• 园艺 • 上一篇    下一篇

砧穗互作对菊花嫁接苗耐盐性的影响

孟蕊(),刘晔,赵爽,房伟民,蒋甲福,陈素梅,陈发棣,管志勇()   

  1. 南京农业大学园艺学院/作物遗传与种质创新国家重点实验室/农业农村部景观农业重点实验室,南京 210095
  • 收稿日期:2020-05-14 接受日期:2020-08-02 出版日期:2021-02-01 发布日期:2021-02-01
  • 通讯作者: 管志勇
  • 作者简介:孟蕊,E-mail: 2017104098@njau.edu.cn
  • 基金资助:
    国家重点研发计划(2019YFD1001500);江苏省农业科技自主创新资金(CX182020)

Effects of Rootstock and Scion Interaction on Salt Tolerance of Grafted Chrysanthemum Seedlings

MENG Rui(),LIU Ye,ZHAO Shuang,FANG WeiMin,JIANG JiaFu,CHEN SuMei,CHEN FaDi,GUAN ZhiYong()   

  1. College of Horticulture, Nanjing Agricultural University/State Key Laboratory of Crop Genetics and Germplasm Enhancement/Key Laboratory of Landscaping, Ministry of Agriculture and Rural Affairs, Nanjing 210095
  • Received:2020-05-14 Accepted:2020-08-02 Online:2021-02-01 Published:2021-02-01
  • Contact: ZhiYong GUAN

摘要:

【目的】揭示黄蒿嫁接菊花对菊花耐盐性的影响,明确砧穗互作影响菊花耐盐性的机理。【方法】测定120 mmol·L-1NaCl胁迫下的‘钟山嫣红’的扦插苗(自根苗)、扦插苗的自根嫁接苗(自接苗)、黄蒿砧木嫁接菊花(异根嫁接苗)的生理指标和叶片、茎段的Na+、K+离子含量。【结果】NaCl胁迫下,异根嫁接苗叶片受害率低于‘钟山嫣红’的自根苗和自接苗。异根嫁接苗的叶片相对电导率、丙二醛含量、脯氨酸含量均低于自接苗和自根苗,叶绿素含量、超氧化物歧化酶(SOD)、过氧化物酶(POD)含量高于自接苗和自根苗。异根嫁接苗中部与下部叶的Na+含量、Na+/K+比值均最低,其次是自接苗,最高是自根苗。自根嫁接与异根嫁接苗上部叶的Na+含量差异不显著;异根嫁接苗接口以上茎段的Na+含量显著低于自接苗和自根苗,而自接苗和自根苗上部茎段的Na+无显著差异,接口以下的黄蒿茎段Na+浓度和Na+/K+是同为砧木的菊花茎段中的两倍。【结论】菊花自接苗运输到中部、下部叶片的离子显著少于自根苗,以黄蒿作为砧木嫁接菊花后,砧木对Na+较高的富集能力降低了Na+在嫁接接口上部的积累,同时,菊花异根嫁接苗表现出更强的光合性能和抗氧化酶活性。因此,以黄蒿作砧木的‘钟山嫣红’异根嫁接苗耐盐性提高,是砧穗愈合导致向上运输到叶片的离子减少和黄蒿砧木滞留更多Na+的共同作用。

关键词: 嫁接, 菊花, 黄蒿, 生理指标, Na+, K+, 耐盐性

Abstract:

【Objective】The objective of this study is to investigate the effects of Artemisia annua grafted with chrysanthemum on the salt tolerance and its interaction between the rootstocks and scions. 【Method】The physiological indexes, including the content of Na+ and K+ in the leaves and stems of chrysanthemum cutting seedlings Zhongshan Yanhong (self-rooted seedlings), self-root grafted cutting seedlings (self-grafted seedlings) and Artemisia annua rootstock grafted cutting seedlings (hetero-root grafted seedlings), were measured under 120 mmol·L-1NaCl stress. 【Result】Under NaCl stress, the damage symptom rate of hetero-root grafted seedling leaves was lower than that of self-rooted and self-grafted seedlings. The relative content of conductivity, malondialdehyde, and proline of hetero-root grafted seedlings were lower than those of self-rooted and self-grafted seedlings, and the content of chlorophyll, superoxide dismutase (SOD), and peroxidase (POD) were higher than self-rooted and self-grafted seedlings. The content of Na+ and Na+/K+ ratios of the middle and lower leaves of the hetero-root grafted seedlings showed the lowest, followed by the self-grafted seedlings, and the highest index was recorded in the self-rooted seedlings. There was no significant difference in Na+ content between the upper leaves of self-grafted seedlings and hetero-root grafted seedlings; the Na+ content of the stems above the interface of hetero-root grafted seedlings was significantly lower than that of self-grafted and self-rooted seedlings, while there was no significant difference in the Na+ content of the upper stems of self-grafted and self-rooted seedlings; the Na+ concentration and Na+/K+ of Artemisia annua stem segments below the interface were twice fold than that of the stem segments of chrysanthemum.【Conclusion】The ion transported from self-grafted seedlings of chrysanthemum to the middle and lower leaves was significantly less than that of self-rooted seedlings. The results indicated that after grafting chrysanthemum with Artemisia annua as a rootstock, the higher Na+ enrichment capacity of rootstock reduced the accumulation of Na+ in the upper part of the grafting interface, while hetero-root grafted seedlings showed stronger photosynthetic performance and antioxidant enzyme activity. Therefore, the improvement of salt tolerance of hetero-root grafted seedlings with Artemisia annua as rootstock was the combined effect of rootstock healing leading to the reduction of ions transported upward to the leaves and the accumulation of Artemisia annua rootstock with more Na+ on the rootstock.

Key words: grafting, chrysanthemum, Artemisia annua, physiological index, Na+, K+, salt tolerance