Narrowband blue LEDs with different peak wavelengths similarly promote seedling elongation and have greater promotion effects than ultraviolet A and far-red in two species of Brassicaceae

文献类型： 外文期刊

第一作者： Li, Qingming

作者： Li, Qingming;Li, Qingming;Llewellyn, David;Kong, Yun;Zheng, Youbin

作者机构：

关键词： hypocotyl length; petiole length; cotyledon size; photomorphogenesis; skotomorphogenesis

期刊名称：CANADIAN JOURNAL OF PLANT SCIENCE （ 影响因子：1.0； ）

ISSN： 0008-4220

年卷期： 2025 年 105 卷

页码：

收录情况： SCI

摘要： Previous studies showed pure blue (B) spectra from light emitting diodes (LEDs) can promote shade avoidance responses (SARs). However, it is unknown whether SARs vary among different peak wavelengths ()peak) of B or how they compare with other photomorphologically-important wavebands. To answer these questions, mustard and arugula seedlings were grown to the cotyledon-unfolding stage under the following narrowband spectrum treatments: ultraviolet A (UVA) ()peak = 385 nm), B1 ()peak = 405 nm), B2 ()peak = 440 nm), B3 ()peak = 455 nm), and far-red (FR) ()peak = 730 nm). Both red (R, )peak = 660 nm) and dark (D) were used as control treatments. The spectrum treatments were provided at 50 mu mol m-2 s-1 on a continuous basis. There were no differences among the three B treatments except for reduced mustard fresh weight in B3. Compared with R, the B treatments promoted hypocotyl elongation, reduced cotyledon size, and increased petiole length in arugula and B1 increased petiole length in mustard. Compared with the B treatments, UVA inhibited hypocotyl and petiole elongation, with responses that were similar to or greater than R in both species. Compared with the B treatments, seedlings grown under FR generally had the lowest hypocotyl and petiole elongation and the smallest cotyledons. Among the LED treatments, the three B treatments had the greatest promotional effects on plant elongation. Therefore, low-intensity B with different )peak can similarly promote hypocotyl elongation as SARs during de-etiolation stage, and have greater promotion effects on elongation than UVA and FR.

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