1、Nitrogen assimilation in plants: current status and future prospects

To increase grain yields, large amounts of fertilizers, especially nitrogen (N) fertilizers, are applied during agricultural production; however, only 30%–50% of the applied N fertilizers could be absorbed and incorporated into crops (Raun and Johnson, 1999).

2、Nitrogen Journey in Plants: From Uptake to Metabolism, Stress Response

Plants uptake and assimilate nitrogen from the soil in the form of nitrate, ammonium ions, and available amino acids from organic sources. Plant nitrate and ammonium transporters are responsible for nitrate and ammonium translocation from the soil into the roots.

3、Nitrogen availability in soil controls uptake of different nitrogen

These differences in N preference among plant species underpin plant community shifts in response to altered N inputs and N cycling, as well as increased ecosystem losses of N forms mineralized in excess to plant uptake.

The Utilization and Roles of Nitrogen in Plants

After N is absorbed and utilized by plants, it plays important regulatory roles in phytohormones, microRNA (miRNA), root development and mycorrhizal symbiosis to cope with environmental stress. Here, we highlight the research progress on the regulation mechanisms for N absorption and assimilation.

Nitrogen nutrition in plants: rapid progress and new challenges

As a main feature of plant autotrophy, assimilation of inorganic nitrogen is not only of fundamental scientific interest, but also a crucial factor in crop productivity.

Compositdb: A Brief Overview of the Compositae

The Compositae (Asteraceae) is one of the largest and most diverse families of flowering plants, comprising one-tenth of all known angiosperm species. It is characterized by the compound inflorescence that has the appearance of a single "composite" flower from which it derives its name.

What Is High In Nitrogen For Plants

Certain plants require more nitrogen than others, showing characteristics like rapid growth, lush foliage, and high chlorophyll demand. They absorb nitrogen from soil as ammonium or nitrates, which bacteria produce.

INTRODUCTION TO THE COMPOSITAE – 3

Illustrated in this issue is a long-cultivated species, although Kew's material of Centaurea cineraria L. (Compositae: Cardueae: Centaureinae), caused some consternation when I first examined it and compared it with many of the images and accounts on the internet, and perhaps not unsurprisingly so.

How Does The Amount Of Nitrogen Affect Plant Growth

Insufficient amounts of nitrogen available to plants can hinder growth and development, but it can also improve root growth, increase nutrient uptake, enhance nutrient balance, and dry mass production.

Nitrogen in plants: from nutrition to the modulation of abiotic stress

Nitrogen is one of the most important nutrient for plant growth and development; it is strongly associated with a variety of abiotic stress responses. As sessile organisms, plants have evolved to develop efficient strategies to manage N to support ...

Compositae plants, belonging to the angiosperm division, include many common flowers such as chrysanthemums and sunflowers. In botany, nitrogen content refers to the concentration of nitrogen-containing compounds within plants. Nitrogen is one of the essential nutritional elements for plant growth, playing a critical role in development, reproduction, and overall vitality. research on nitrogen content in Compositae plants is relatively scarce. Potential reasons include:

1. Diverse Species and Habitats: Compositae encompass a wide variety of species with broad geographical distribution, leading to varied nitrogen requirements. This diversity makes it challenging to conduct unified studies across the entire family.

2. Shallow Root Systems and Limited Nitrogen Uptake: Most Compositae are herbaceous or shrubby plants with shallow roots. Soil nitrogen is easily decomposed by microorganisms, limiting available nitrogen for absorption. Additionally, their smaller leaves and lower photosynthetic efficiency further restrict nitrogen utilization.

3. Agricultural Focus on Major Crops: Research often prioritizes staple crops like grains over Compositae due to their perceived minor role in agricultural ecosystems or insufficient recognition of their value.

4. Divergent Fertilization Needs: Nitrogen application rates and methods significantly impact plant growth. Practices optimized for major crops may not suit Compositae, as their growth habits and physiological mechanisms differ substantially.

Despite generally lower nitrogen content, Compositae still require adequate nitrogen for healthy development. For example:

• Moderate nitrogen fertilization enhances chrysanthemum flower quantity and quality, improving ornamental value.
• Proper nitrogen use promotes sunflower growth, boosting yield and kernel quality.

In agriculture, rational nitrogen management is key to sustainable crop production. Excessive nitrogen, leads to soil salinization, compaction, and environmental degradation. Thus, fertilization should consider soil fertility, crop needs, and ecological context to balance productivity and sustainability.

While Compositae have relatively low nitrogen requirements, appropriate nitrogen supplementation remains crucial for their growth and functional potential. Responsible fertilization practices can maximize their ecological benefits and ornamental value, contributing to both agricultural and environmental sustainability.