Lateral root primordium: Formation, influencing factors and regulation

Hu, Fei; Fang, Da; Zhang, Weimeng; Dong, Kui; Ye, Ziyi; Cao, Jun

doi:10.1016/j.plaphy.2024.108429

Cited by 5 publications

(2 citation statements)

References 116 publications

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“…Genes were significantly differentially expressed in different tissues (RB, RT, RM) but less differentially expressed 1 d, 2 d, and 3 d after sowing ( Figure 3 ). Auxin plays a decisive role during LR formation [ 12 ]. Genes and proteins involved in auxin transport and signaling pathways regulate different stages of plant LR development [ 30 ].…”

Section: Discussionmentioning

confidence: 99%

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Transcriptome Analysis of Early Lateral Root Formation in Tomato

Zhang,

Shang

2024

Plants

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Lateral roots (LRs) receive signals from the inter-root environment and absorb water and nutrients from the soil. Auxin regulates LR formation, but the mechanism in tomato remains largely unknown. In this study, ‘Ailsa Craig‘ tomato LRs appeared on the third day and were unevenly distributed in primary roots. According to the location of LR occurrence, roots were divided into three equal parts: the shootward part of the root (RB), the middle part of the root (RM), and the tip part of the root (RT). Transverse sections of roots from days 1 to 6 revealed that the number of RB cells and the root diameter were significantly increased compared with RM and RT. Using roots from days 1 to 3, we carried out transcriptome sequencing analysis. Identified genes were classified into 16 co-expression clusters based on K-means, and genes in four associated clusters were highly expressed in RB. These four clusters (3, 5, 8, and 16) were enriched in cellulose metabolism, microtubule, and peptide metabolism pathways, all closely related to LR development. The four clusters contain numerous transcription factors linked to LR development including transcription factors of LATERAL ORGAN BOUNDRIES (LOB) and MADS-box families. Additionally, auxin-related genes GATA23, ARF7, LBD16, EXP, IAA4, IAA7, PIN1, PIN2, YUC3, and YUC4 were highly expressed in RB tissue. Free IAA content in 3 d RB was notably higher, reaching 3.3–5.5 ng/g, relative to RB in 1 d and 2 d. The LR number was promoted by 0.1 μM of exogenous IAA and inhibited by exogenous NPA. We analyzed the root cell state and auxin signaling module during LR formation. At a certain stage of pericycle cell development, LR initiation is regulated by auxin signaling modules IAA14-ARF7/ARF19-LBD16-CDKA1 and IAA14-ARF7/ARF19-MUS/MUL-XTR6/EXP. Furthermore, as a key regulatory factor, auxin regulates the process of LR initiation and LR primordia (LRP) through different auxin signaling pathway modules.

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Section: Discussionmentioning

confidence: 99%

“…LR initiation to emergence is influenced by the plant hormone auxin [ 12 ]. Auxin is primarily synthesized in young leaves and cotyledons and is then transported through the phloem to the root sink.…”

Section: Introductionmentioning

confidence: 99%

Transcriptome Analysis of Early Lateral Root Formation in Tomato

Zhang,

Shang

2024

Plants

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Fermentation broth of a novel endophytic fungus enhanced maize salt tolerance by regulating sugar metabolism and phytohormone biosynthesis or signaling

Li,

Liu,

et al. 2024

Plant Physiology and Biochemistry

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Melatonin mitigates root growth inhibition and carbon-nitrogen metabolism imbalance in apple rootstock M9T337 under high nitrogen stress

Sun,

Wang,

Zhang

et al. 2024

Front. Plant Sci.

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Nitrogen (N) is an essential element for plant growth, development, and metabolism. In apple production, the excessive use of N fertilizer may cause high N stress. Whether high N stress can be alleviated by regulating melatonin supply is unclear. The effects of melatonin on root morphology, antioxidant enzyme activity and 13C and 15N accumulation in apple rootstock M9T337 treated with high N were studied by soil culture. The results showed that correctly raising the melatonin supply level is helpful to root development of M9T337 rootstock under severe N stress. Compared with HN treatment, HN+MT treatment increased root and leaf growth by 11.38%, and 28.01%, respectively. Under high N conditions, appropriately increasing melatonin level can activate antioxidant enzyme activity, reduce lipid peroxidation in roots, protect root structural integrity, promote the transport of sorbitol and sucrose to roots, and promote further degradation and utilization of sorbitol and sucrose in roots, which is conducive to the accumulation of photosynthetic products, thereby reducing the inhibitory effect of high N treatment on root growth. Based on the above research results, we found that under high N stress, melatonin significantly promotes nitrate absorption, enhances N metabolism enzyme activity, and upregulates related gene expression, and regulate N uptake and utilization in the M9T337 rootstock. These results presented a fresh notion for improving N application and preserving carbon-nitrogen balance.

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Lateral root primordium: Formation, influencing factors and regulation

Cited by 5 publications

References 116 publications

Transcriptome Analysis of Early Lateral Root Formation in Tomato

Transcriptome Analysis of Early Lateral Root Formation in Tomato

Fermentation broth of a novel endophytic fungus enhanced maize salt tolerance by regulating sugar metabolism and phytohormone biosynthesis or signaling

Melatonin mitigates root growth inhibition and carbon-nitrogen metabolism imbalance in apple rootstock M9T337 under high nitrogen stress

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