Trade-offs between growth, turf quality and physiological responses in tall fescue under continuous lighting at different intensity

IF 4.2 2区农林科学 Q1 HORTICULTURE

Scientia Horticulturae Pub Date : 2025-06-01 DOI:10.1016/j.scienta.2025.114209

Jiabao Chen , Xiaowei Ding , Yongshan Li , Yufeng Chen , Ye Ai , Chenyan Jia , Huiping Zhou , Liebao Han

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引用次数: 0

Abstract

Light intensity, duration, and spectral composition play critical roles in influencing the growth, and establishment quality of plants. However, the effects of continuous light emitting diode (LED) lighting and various light intensities on the morphological development, turf quality, physiological processes, elemental accumulation, and photodamage mechanisms of tall fescue (Festuca arundinacea) remain unclear. Understanding the response mechanisms of the growth and turf quality of tall fescue to different light intensities under continuous LED lighting is crucial for the efficient application of continuous lighting in turfgrass cultivation such as plant factories. In this experiment, normal light period (NL) of 16 (light)/8 (dark) h (300 μmol·m⁻²·s⁻¹), together with continuous light treatments at different intensities (150 μmol·m⁻²·s⁻¹, 300 μmol·m⁻²·s⁻¹, and 450 μmol·m⁻²·s⁻¹, namely CL150, CL300 and CL450), were conducted to assess the effect of continuous lighting exposure at varying intensities on the morphology, physiological characteristics, and quality traits of tall fescue. The results showed that compared to NL, CL300 significantly enhanced the turf quality of tall fescue, whereas CL450 did not exhibit a significant improvement with increasing light intensity. In the ultrastructure of tall fescue chloroplasts, the number of chloroplasts was higher under CL300 and CL450 treatments, while a significant increase in the number and size of starch granules was observed specifically in CL450. With the increase in continuous light intensity, the degree of photo-oxidation induced by reactive oxygen species (ROS) in the leaves gradually intensified, leading to a substantial accumulation of malondialdehyde (MDA). Moreover, the reduction in mineral element content in the leaves due to increased light intensity further exacerbated the plant's damage under continuous lighting. In summary, CL300 can improve the turf quality of tall fescue while causing less damage to the plants. In addition, it is indicated that the factors including accumulation of carbohydrate, the damage of photooxidation and the reduction of mineral element content in leaves may be the main reasons for the quality decline of tall fescue under excessive continuous light intensities.

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不同光照强度下高羊茅生长、草坪质量和生理反应的权衡

光照强度、持续时间和光谱组成对植物的生长和成材品质有重要影响。然而，连续发光二极管（LED）照明和不同光强对高羊茅形态发育、草皮质量、生理过程、元素积累和光损伤机制的影响尚不清楚。了解LED连续照明下高羊茅生长和草坪质量对不同光强的响应机制，对于在植物工厂等草坪草种植中高效应用连续照明至关重要。本实验采用16（光）/8（暗）h （300 μmol·m⁻2·s⁻¹）的正常光照周期（NL），以及不同强度的连续光照处理（150 μmol·m⁻2·s⁻¹、300 μmol·m⁻2·s⁻¹和450 μmol·m⁻2·s⁻¹，即CL150、CL300和CL450），考察不同强度的连续光照对高大羊驼草形态、生理特征和品质性状的影响。结果表明，与NL相比，CL300显著提高了高羊茅的草坪质量，而CL450随光照强度的增加没有显著改善。在高羊茅叶绿体的超微结构中，CL300和CL450处理的叶绿体数量较多，淀粉颗粒的数量和大小在CL450处理中有显著增加。随着连续光照强度的增加，叶片中活性氧（ROS）诱导的光氧化程度逐渐增强，导致丙二醛（MDA）大量积累。此外，由于光照强度的增加，叶片中矿物质元素含量的降低进一步加剧了连续光照对植株的伤害。综上所述，CL300在提高高羊茅草坪质量的同时，对植物的伤害较小。同时指出，碳水化合物积累、光氧化损伤和叶片矿质元素含量降低等因素可能是高羊茅在过度连续光照下品质下降的主要原因。

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来源期刊

Scientia Horticulturae 农林科学-园艺

CiteScore

8.60

自引率

4.70%

发文量

796

审稿时长

47 days

期刊介绍： Scientia Horticulturae is an international journal publishing research related to horticultural crops. Articles in the journal deal with open or protected production of vegetables, fruits, edible fungi and ornamentals under temperate, subtropical and tropical conditions. Papers in related areas (biochemistry, micropropagation, soil science, plant breeding, plant physiology, phytopathology, etc.) are considered, if they contain information of direct significance to horticulture. Papers on the technical aspects of horticulture (engineering, crop processing, storage, transport etc.) are accepted for publication only if they relate directly to the living product. In the case of plantation crops, those yielding a product that may be used fresh (e.g. tropical vegetables, citrus, bananas, and other fruits) will be considered, while those papers describing the processing of the product (e.g. rubber, tobacco, and quinine) will not. The scope of the journal includes all horticultural crops but does not include speciality crops such as, medicinal crops or forestry crops, such as bamboo. Basic molecular studies without any direct application in horticulture will not be considered for this journal.