| 【Objective】 The aim of this study was to investigate the influence of light supplementation in winter
on cuttage propagation and growth of miniature rose in greenhouse in South China and to provide theoretical basis for the
commercial cultivation of miniature rose. 【Method】 The miniature rose cultivar ‘fenjiaren’ were selected as tested
material. A complete randomized experiment was designed with two treatments, namely, supplementary light (PPFD
50μmol/(m2·s) ) and control ( natural light). During the growth period, mother plant with supplementary light were exposed
to 50μmol/(m2·s) LED red and blue light for 9 h a day at 4：00-9：00 and 16：00-20：00, to observe its influence on the cutting quality and growth of miniature rose.【Result】 Supplementary lighting did not significantly affect the longest
root length and the average root length, which were 8.97 cm and 7.92 cm respectively, and its root number was 18.5. While
the longest root length and the average length of control treatment were 8.32 cm and 7.64 cm respectively, and its root number
was 19.3. For the three indicators mentioned above, there was no significant difference between two treatment. The root fresh
weight, root dry weight, leaf fresh weight, leaf dry weight, above-ground fresh weight and above-ground dry weight of miniature
rose cutting seedlings increased by 26.55%%, 85.71%, 40.68%, 50%, 38.37% and 42.86%, respectively. The plant height,
stem diameter and leaf area of cutting seedlings treated with supplementary lighting were 14.37 cm, 2.25 mm and 16.74 cm2
respectively and the number of node was 8.07. While the plant height, stem diameter and leaf area of the control group were
11.91 cm, 1.97 mm and 13.49 cm2, respectively, and the number of node was 6.33. The above four indicators of supplementary
lighting treatment were extremely significantly different from those of the control. The single flowering period of miniature rose
were both about 28 days, and the flowering rate and yield of potted flowers could be increased significantly by supplementary
lighting, which could reduce the incidence of blind bloom and could advance the flowering period about 10 days. 【Conclusion】
Results in this study indicate that supplementary lighting to greenhouse miniature roses in winter in South China could obtain
better cutting effect, higher flowering rate and higher yield, and the flowering period could also be advanced. |
