与西伯利亚桤木混作加重了盐暴露对刺槐植株生长和主要生理过程的负面影响。

IF 3.6 2区 生物学 Q1 PLANT SCIENCES
Sumei Li, Ruijie Zhang, Qiuling Hui, Heinz Rennenberg, Bin Hu
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引用次数: 0

摘要

盐度是严重影响植物生长发育的主要威胁。混合种植已被证明能有效提高树种的耐盐性。然而,掺入桤木是否能促进固氮刺槐在盐碱地上的生长发育尚不清楚。为了解决这一问题,将单株刺槐幼苗和与西伯利亚桤木(Alnus hirsuta Turcz)混合的刺槐幼苗进行了研究。(ex Rupr.),分析其生长参数、光合特性、阳离子含量和比值、相容性溶质的渗透调节和抗氧化代谢。结果表明:盐暴露显著降低了红木单作和与桤木混作时刺槐的全株生物量、净光合速率、总叶绿素含量和根瘤氮酶活性;盐暴露显著增加了单栽和混栽刺槐叶片中Na+、丙二醛和过氧化氢的积累。盐胁迫下,混合种植由于种间竞争,显著抑制了刺槐的生长和固氮能力,表现为生物量积累和光合效率较单一种植降低。此外,混播还加重了刺槐根部Na+毒性,增强了刺槐叶片和根部的氧化应激,表现为过氧化氢含量升高。综上所述,在苗期与桤木混种不仅抑制了刺槐的固氮能力,而且降低了刺槐的耐盐性。为在苗期特别是盐碱化土壤中建立刺槐混交林提供了重要的理论参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mixed Cultivation With Siberian Alder Worsens the Negative Impact of Salt Exposure on Growth and Major Physiological Processes of Black Locust Plants.

Salinity is a major threat that can greatly affect the growth and development of plants. Mixed planting has been shown to effectively improve the salinity tolerance of tree species. However, it is still unknown whether admixing alder trees promotes the growth and development of N2-fixing Robinia pseudoacacia on saline soil. To address this question, single-planted Robinia seedlings and Robinia seedlings mixed with Siberian alder (Alnus hirsuta Turcz. ex Rupr.) were subjected to salt exposure, and growth parameters, photosynthetic characteristics, cation contents and ratios, osmoregulation by compatible solutes, and antioxidant metabolism were analyzed. The results showed that salt exposure significantly reduced whole-plant biomass, net photosynthesis rate, total chlorophyll content, and nodule nitrogenase activity of Robinia at both single and mixed planting with Siberian alder. Salt exposure significantly increased the accumulation of Na+, malondialdehyde, and hydrogen peroxide in the leaves of both single and mixed planted Robinia. Under salt exposure, mixed planting significantly inhibited the growth and nitrogen fixation capacity of Robinia due to interspecific competition, indicated by reduced biomass accumulation and photosynthetic efficiency compared with single planting. In addition, mixed planting exacerbated Na+ toxicity in Robinia roots and enhanced oxidative stress in Robinia leaves and roots, indicated by elevated hydrogen peroxide contents. These results indicate that mixing Robinia with Siberian alder at the seedling stage not only inhibits the nitrogen fixation capacity of Robinia but also reduces its salinity tolerance. They provide an important theoretical reference for the establishment of mixed Robinia forests at the seedling stage, particularly in salinized soils.

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来源期刊
Physiologia plantarum
Physiologia plantarum 生物-植物科学
CiteScore
11.00
自引率
3.10%
发文量
224
审稿时长
3.9 months
期刊介绍: Physiologia Plantarum is an international journal committed to publishing the best full-length original research papers that advance our understanding of primary mechanisms of plant development, growth and productivity as well as plant interactions with the biotic and abiotic environment. All organisational levels of experimental plant biology – from molecular and cell biology, biochemistry and biophysics to ecophysiology and global change biology – fall within the scope of the journal. The content is distributed between 5 main subject areas supervised by Subject Editors specialised in the respective domain: (1) biochemistry and metabolism, (2) ecophysiology, stress and adaptation, (3) uptake, transport and assimilation, (4) development, growth and differentiation, (5) photobiology and photosynthesis.
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