辐照和氮素对海南Horsfieldia幼苗生长和生理的调控

IF 0.8 4区 生物学 Q4 PLANT SCIENCES Biologia Plantarum Pub Date : 2023-01-31 DOI:10.32615/bp.2022.038
W. Luo, Y. Wang, L. Wang
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引用次数: 0

摘要

防止灭绝是国际社会面临的最大挑战之一。苗木繁育是恢复海南Horsfieldia hainanensis Merr等濒危物种的有效手段。,自然再生期困难。在本研究中,我们通过比较20个不同辐射组合(全自然辐射的100、67.5、45.7、15.6%)和5个氮供应水平(0、1.8、3.6、5.4、7.2g植物-1)的处理,研究了海南海绵藻幼苗培养的最佳辐射和氮组合。我们发现,与遮荫的幼苗相比,全光照下幼苗的生长和光合效率受到显著抑制。在全光照下,氮的缺乏导致叶绿素(Chl)合成减少,导致光合效率降低和代谢失衡。适当的遮荫(自然辐照度的67.5%和45.7%)和氮的添加(1.8-5.4g植物-1)促进了根系发育,增加了叶绿素含量和光合作用,最终积累了大量的生物量。遮荫幼苗的生物量主要分布在地上组织,而暴露在较强辐射下的幼苗积累了较大的根系生物量。因此,该物种的最佳幼苗管理是67.5%的自然辐照度和适度的氮供应(4.6克植物-1)的组合。
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Irradiation and nitrogen regulate growth and physiology in Horsfieldia hainanensis seedlings
Preventing extinction is one of the greatest challenges facing the global community. Nursery stock breeding is an effective means to restore endangered species, such as Horsfieldia hainanensis Merr., with difficulty in natural regeneration period. In this study, we investigated the optimum combination of irradiance and nitrogen for the cultivation of H. hainanensis seedlings by comparing twenty treatments with different combinations of irradiances (100, 67.5, 45.7, 15.6 % of full natural irradiance) and five levels of N supply (0, 1.8, 3.6, 5.4, 7.2 g plant -1 ). We found that the growth and photosynthetic efficiency of seedlings under full irradiance were significantly inhibited compared with shaded seedlings. Under full irradiance, a lack of N resulted in reduced chlorophyll (Chl) synthesis, causing lower photosynthetic efficiency and an imbalance in metabolism. Proper shading (67.5 and 45.7 % of natural irradiance) and N addition (1.8 - 5.4 g plant -1 ) promoted root development, increase Chl content and photosynthesis, and ultimately the accumulation of larger amount of biomass. The biomass of the shaded seedlings was mainly distributed to aboveground tissues, while seedlings exposed to stronger radiation accumulated greater root biomass. Therefore, the best seedling management for this species is a combination of 67.5 % of natural irradiance and moderate N supply (4.6 g plant -1 ).
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来源期刊
Biologia Plantarum
Biologia Plantarum 生物-植物科学
CiteScore
2.80
自引率
0.00%
发文量
28
审稿时长
3.3 months
期刊介绍: BIOLOGIA PLANTARUM is an international journal for experimental botany. It publishes original scientific papers and brief communications, reviews on specialized topics, and book reviews in plant physiology, plant biochemistry and biophysics, physiological anatomy, ecophysiology, genetics, molecular biology, cell biology, evolution, and pathophysiology. All papers should contribute substantially to the current level of plant science and combine originality with a potential general interest. The journal focuses on model and crop plants, as well as on under-investigated species.
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