Page 178 - 《广西植物》2022年第12期
P. 178
2 1 6 8 广 西 植 物 42 卷
Abstract: Michelia gioii is a precious broad ̄leaved tree species in Chinaꎬ which is of great value in terms of woodꎬ
fragrance and landscape. In order to further cultivate excellent seedlings and develop and utilize the non ̄woody
resourcesꎬ the seedlings of M. gioii were placed under eight light conditions with the same light intensityꎬ which were
 ̄1
composed by two photoperiods (12ꎬ 16 hd ) and four light qualities (R ∶ B= 8 ∶ 1ꎬ R ∶ B= 6 ∶ 1ꎬ R ∶ B ∶ P ∶ G =
8 ∶ 1 ∶ 1 ∶ 1ꎬ R ∶ B ∶ P ∶ G = 6 ∶ 1 ∶ 1 ∶ 1ꎬ Rꎬ Bꎬ P and G respectively represent red lightꎬ blue lightꎬ purple light
and green light). The results were as follows: (1)The growth of seedling height and ground diameterꎬ leaf aspect ratioꎬ
maximum net photosynthetic rateꎬ dark respiration rate and light compensation point reached the maximum values under
 ̄1
the light quality R ∶ B = 6 ∶ 1 with a photoperiod of 12 hd ꎬ while the leaf area and chlorophyll content were the
 ̄1
highest under the light quality R ∶ B ∶ P ∶ G = 6 ∶ 1 ∶ 1 ∶ 1 with a photoperiod of 16 hd . (2) Compared to the
 ̄1
treatment of photoperiod 12 hd ꎬ the indicators in growth of seedling heightꎬ leaf areaꎬ quality indexꎬ chlorophyll a+b
contentꎬ chlorophyll a/ b ratioꎬ carotenoid content and light saturation point showed higher under photoperiod 16 h
 ̄1
d . (3) The addition of purple and green light into the red ̄blue light combination increased the quality index of
seedlings and positively affected the synthesis and accumulation of photosynthetic pigments. (4) Compared with the light
quality R ∶ B= 8 ∶ 1ꎬ R ∶ B = 6 ∶ 1 had more potential to promote the growth of seedling heightꎬ ground diameter and
leafꎬ and to improve the photosynthesis of M. gioii seedlings. In conclusionꎬ the light quality R ∶ B ∶ P ∶ G= 6 ∶ 1 ∶ 1 ∶
 ̄1
1 with a photoperiod of 16 hd demonstrates the higher possibility to promote the growth and photosynthesis of M. gioii
 ̄1
seedlingsꎬ followed by the light quality R ∶ B= 6 ∶ 1 with a photoperiod of 12 hd .
Key words: Michelia gioiiꎬ LEDꎬ light qualityꎬ photoperiodꎬ growth characteristicsꎬ photosynthetic characteristics
相较于传统光源ꎬLED 灯为冷光源ꎬ可靠近植 基础上添加其他光源的复合光的研究还较少ꎮ
物照明ꎬ具有更强的耐用性和更窄的波谱ꎬ能更好 香子含笑(Michelia gioii) 又名八角香兰、香梓
地控制光质和光强( 崔瑾等ꎬ2008ꎻSabzalian et al.ꎬ 楠、麻罕、香籽含笑等ꎬ为木兰科含笑属常绿乔木ꎮ
2014)ꎮ 随着生产工艺水平的提高和成本的降低ꎬ 该树种具有广泛的用途ꎬ是我国亚热带地区珍贵
LED 灯已被广泛应用在人工补光、植物组培、遗传 的用材树种和优良的园林绿化树种ꎮ 前人已对其
育种、植物工厂以及太空农业等领域ꎬ但目前在林 木材质量(黎小波等ꎬ2014)、轻基质育苗(麻静等ꎬ
木育苗及资源化培育中应用很少ꎮ 光周期不仅能 2012)和嫁接繁殖(李运兴ꎬ2001)等技术进行了研
调控植物成花诱导、花芽分化和植物休眠ꎬ还影响 究ꎮ 由于其全株具有芳香气味、种子可入药兼做
植物的光合作用和光形态建成ꎬ调控和诱导植物生 调味品ꎬ因此前人对其叶( 李国红等ꎬ2007ꎻ闫浩
长(王建平等ꎬ2020)ꎮ 在黄昏后补充 LED 照明可以 等ꎬ2019)、果实( 刘杰凤等ꎬ2007ꎻ黄敏等ꎬ2008)、
显著促进植物的生长发育(Koksal et al.ꎬ 2015)ꎮ 因 枝条(Ha et al.ꎬ 2019) 等部位的化学成分进行了
此ꎬ在苗木培育中ꎬ通过补光技术ꎬ延长光周期来加 分析ꎬ并且分别在种子和叶中发现了在医药上具
快生长速度ꎬ有望解决苗木幼苗期生长缓慢的问 有重要用途的苯丙酸甘和小白 菊 内 酯 ( Wang et
题ꎮ 光质即不同波长的光谱ꎬ是影响植物生长、叶 al.ꎬ 2011ꎻ夏伟等ꎬ2014)ꎮ 可见ꎬ香子含笑具有较
形、花形态、生化特性和光合效率的主要因素之一 大的非木质资源开发利用潜力ꎮ 光照条件不仅对
(Lin et al.ꎬ 2021)ꎮ 光质对植物光合作用的调节主 植物的形态建成、生理代谢、生长发育起重要调节
要体现在植物叶绿体形成、光合色素合成、叶片气 作用ꎬ还对植物有效成分含量产生影响ꎬ利用光调
孔运动、 叶 片 伸 展 和 碳 同 化 等 方 面 ( 邢 阿 宝 等ꎬ 控技术ꎬ将有助于优良香子含笑苗木培育和开发
2018)ꎮ 植物对各种光质的敏感程度不同ꎬ在可见 利用其非木质资源ꎮ 因此ꎬ本研究利用 LED 灯调
光光谱(400~700 nm)中ꎬ植物和光感受器所能感受 制不同光质配比和控制光周期ꎬ研究光质及光周
到的 主 要 波 长 是 蓝 色 ( 400 ~ 500 nm) 和 红 色 期对香子含笑生长和光合特性的影响ꎬ筛选适合
(600 ~ 700 nm)ꎬ 绿 色 ( 500 ~ 600 nm) 相 对 较 少 定向培育香子含笑的 LED 光环境因子组合ꎬ以期
(Huché ̄Thélier et al.ꎬ 2016)ꎮ 虽然已有许多关于 为利用 LED 光源进行木本植物资源化培育的推广
红蓝组合光对植物生长影响的研究ꎬ但在红蓝光 应用提供参考ꎮ

