Does constant or changing light give the best rooting of hibiscus cuttings of two sizes?

文献类型： 外文期刊

第一作者： Yang, Xin

作者： Yang, Xin;Yang, Xin;Li, Shenglan;Yang, Xin;Li, Shenglan;Liu, Fulai;Rosenqvist, Eva

作者机构：

关键词： Hibiscus; Rooting of cuttings; Cutting size; Changing light regimes; Light integral; Photosynthesis; Carbohydrates

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：4.3； 五年影响因子：4.5 ）

ISSN： 0304-4238

年卷期： 2023 年 309 卷

页码：

收录情况： SCI

摘要： In this experiment the effect of light intensity (photosynthetic photon flux density, PPFD) and cutting size (10 and 7 cm) was investigated during five weeks rooting of hibiscus (Hibiscus rosa-sinensis L. 'Adonicus Yellow'). The light regimes included three constant PPFD: 16, 76 and 151 mu mol m- 2 s- 1; and three changing PPFD after two weeks: 16 -* 76, 16 -* 151 and 76 -* 151 mu mol m- 2 s- 1. The light intensity has a dual effect, promoting photosynthesis and carbohydrate production, but also water loss through transpiration with the potential for desiccating the cutting. The treatments starting with 16 mu mol m- 2 s- 1 insufficiently supported the rooting process, illustrated by the lack shoot growth after two weeks. Within each treatment type (constant or changing PPFD) the root formation was linearly correlated to the total light integral for the propagation period (r2 = 0.835-1.000) for respective cutting size. The changing PPFD treatments showed the strongest response to increasing light integral with the [76 -* 151] treatment producing most roots for both cutting sizes, despite the constant 151 mu mol m- 2 s- 1 having the highest total light integral. This indicates that conserving water is of crucial importance before root emergence in the third week of rooting. The 7 cm cuttings produced more root biomass and had higher root:shoot ratio than the 10 cm cuttings. The 7 cm cuttings had higher rates of photosynthesis one week after rooting, probably due to higher sink demand from the growing roots and mobilised more soluble sugars from the leaves. The rooting process takes five weeks and does not demand high light, so the results are promising for moving propagation of hibiscus from the greenhouse to a vertical production system based on light emitting diodes (LEDs) to save production area for final production.

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