光质对草珊瑚幼苗生长及其生理生化基础的影响

doi:10.11686/cyxb2019465

摘要/Abstract

摘要： 研究3种不同光质[白光(WL)、红光(RL)和蓝光(BL)]对草珊瑚幼苗的生长状态和相关生理生化指标的影响。选取不同光质处理下的草珊瑚幼苗,测定生长状态(株高、地径、总鲜重、总干重、根系形态指标、根冠比)和相关生理生化指标[叶绿素含量、可溶性蛋白含量、可溶性糖含量、还原糖含量、淀粉含量、丙二醛(MDA)含量、过氧化物酶(POD)活性、超氧化物歧化酶(SOD)活性、净光合速率(P_n)、最大光能利用率(LUE_max)、最大水分利用率(WUE_max)和最大光合效率(F_v/F_m)],并结合方差统计方法进行分析比较。在不同光质处理下,大部分试验指标均有显著差异,与白光和蓝光处理相比,红光除了能促进幼苗株高及WUE_max增加外,其他相关指标都显著减少;与白光相比,蓝光的根系各形态指标、根冠比、可溶性蛋白含量、MDA含量、POD活性、SOD活性、WUE_max等相关指标显著增加,其他指标都相应减小。红光处理能够促进草珊瑚幼苗的株高和WUE_max增加,但导致其他指标显著降低。蓝光处理不仅显著增加幼苗根系的各形态指标,而且提高了其最大水分利用率,结果可为利用LED光质调控技术提高草珊瑚幼苗的培育技术提供一定的理论基础。

关键词: 草珊瑚, 光质, 生理生化指标, 最大水分利用率, 最大光能利用率, 最大光合效率

Abstract: This research aimed to explore in detail the effects of three light regimes [white light (WL), red light (RL), and blue light (BL)] on growth status and physiological and biochemical traits of Sarcandra glaba seedlings. Measures of plant growth status conducted were: plant height, stem diameter, total fresh weight (roots and shoots), total dry weight (roots and shoots), root morphology indexes, and root∶shoot ratio. Physiological and biochemical traits measured included chlorophyll, solution protein, solution sugar, reducing sugar, and malondialdehyde (MDA) concentrations of leaf tissues; peroxidase (POD) and superoxide dismutase (SOD) activities, net photosynthetic rate (P_n), maximum light use efficiency (LUE_max), maximum water use efficiency (WUE_max) and maximum photosynthetic efficiency (F_v/F_m). Most of the measured traits showed differences between light regimes. Compared with WL and BL groups, the RL treatment resulted in a significant reduction in a majority of the measured traits. Exceptions were plant height and WUE_max which were increased in RL. Compared with the WL treatment, in the BL light regime, root morphology indexes, root∶shoot ratio, protein and MDA concentrations, POD and SOD activities and WUE_max were considerably increased, while other indexes were decreased. In this experiment, the RL treatment resulted in a significant decrease in many traits. Meanwhile, the BL regime not only stimulated root morphology indexes, but also improved WUE_max. This research lays a theoretical foundation for developing light quality guidelines for the cultivation of S. glaba seedlings.

Key words: Sarcandra glaba, light qualities, physiological and biochemical indexes, maximum water use efficiency, maximum light use efficiency, maximum photosynthetic efficiency

谢德金, 李静文, 叶友杰, 殷彪, 任可, 陈凌艳, 荣俊冬, 郑郁善. 光质对草珊瑚幼苗生长及其生理生化基础的影响[J]. 草业学报, 2020, 29(8): 104-115.

XIE De-jin, LI Jing-wen, YE You-jie, YIN Biao, REN Ke, CHEN Ling-yan, RONG Jun-dong, ZHENG Yu-shan. Effects of light quality on growth, and physiological and biochemical traits of Sarcandra glaba seedlings[J]. Acta Prataculturae Sinica, 2020, 29(8): 104-115.

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