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中国农学通报

中国农学通报 ›› 2023, Vol. 39 ›› Issue (35): 61-70.doi: 10.11924/j.issn.1000-6850.casb2022-1024

• 林学·园艺·园林 • 上一篇    下一篇

遮阴对紫叶紫薇幼苗生长及光合特性的影响

马晓华1(), 张旭乐1, 章彦君2, 胡青荻1, 钱仁卷1, 郑坚1(), 汤真勇3   

  1. 1 浙江省亚热带作物研究所，温州市资源植物创新利用重点实验室，浙江温州 325005
    2 国家林业和草原局竹子研究中心，杭州 310000
    3 温州青源园艺科技有限公司，浙江温州 325005
  • 收稿日期:2022-12-13 修回日期:2023-02-09 出版日期:2023-12-11 发布日期:2023-12-11
  • 通讯作者:
    郑坚，1978年出生，男，研究员，硕士研究生，研究方向：观赏植物植物栽培管理与育种。通信地址：325005 浙江省温州市雪山路334号，Tel：0577-88518070，E-mail：。
  • 作者简介:

    马晓华，1989年出生，女，助理研究员，硕士研究生，研究方向：观赏植物生理生化与育种。通信地址：325005 浙江省温州市雪山路334号，Tel：0577-88527225，E-mail：。

  • 基金资助:
    温州市农业新品种选育协作组项目“紫薇和兰属种质收集、保育与新种质创制”(2019ZX004-3)

The Influence of Shading on Growth and Photosynthetic Characteristics of Purple-leaf Lagerstroemia indica

MA Xiaohua1(), ZHANG Xule1, ZHANG Yanjun2, HU Qingdi1, QIAN Renjuan1, ZHENG Jian1(), TANG Zhenyong3   

  1. 1 Institute of Subtropical Crops of Zhejiang Province/ Wenzhou Key Laboratory of Innovative Utilization of Plant Resources, Wenzhou, Zhejiang 325005
    2 Bamboo Research Center, National Forestry and Grassland Administration, Hangzhou 310000
    3 Wenzhou Qingyuan Horticulture Technology Co., Ltd., Wenzhou, Zhejiang 325005
  • Received:2022-12-13 Revised:2023-02-09 Published-:2023-12-11 Online:2023-12-11

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摘要：

为探究遮阴对紫叶紫薇生长及光合特性的影响，明确紫叶紫薇对不同光照强度的适应性，通过遮阴方法设置4个不同的光照强度水平L1(CK)、L2（轻度遮阴）、L3（中度遮阴）、L4（重度遮阴），测定2个紫叶紫薇品种的比叶重、光响应曲线、叶绿素荧光参数、抗氧化酶等生理生化指标。结果表明：随着遮阴程度的增加，‘午夜紫薇’与‘巧克力紫薇’的叶面积与光合色素含量逐渐升高，与之相反，比叶重逐渐降低；‘巧克力紫薇’与‘午夜紫薇’的净光合速率(Pn)随着光照强度(PAR)增加逐渐升高，当PAR>800 μmol/(m2·s)时，Pn的增加逐渐趋于缓慢，最后达到光饱和。‘午夜紫薇’与‘巧克力紫薇’的光饱和点和光补偿点在L1遮荫处理时显著低于其他遮荫处理，且随着遮荫程度的增加，二者的Pmax（最大净光合速率）呈现先增加后降低的趋势；‘巧克力紫薇’与‘午夜紫薇’的Pn随着胞间二氧化碳(CO2)浓度的增加而逐渐上升，当Ci（胞间CO2浓度）>1000 µmol/mol时，Pn随Ci的升高的增加趋于缓慢。‘午夜紫薇’与‘巧克力紫薇’的CO2补偿点随着遮荫程度的增加而逐渐降低。‘巧克力紫薇’Y(II)（实际光化学量子效率）随着遮荫程度的增加逐渐增加，而‘巧克力紫薇’与‘午夜紫薇’Y(NO)（与光无关的基本散热量子效率）则随着遮荫程度的增加而显著降低。L1全光照条件显著增加了‘午夜紫薇’与‘巧克力紫薇’的O2-产生速率与H2O2含量及超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性。因此，全光照条件下紫叶紫薇出现一定的光抑制现象，轻度遮阴可提高紫叶紫薇的光能利用率，促进生长发育，同时紫叶紫薇对弱光具有一定的适应性。

关键词: 紫叶紫薇, 遮阴, 生长, 光合特性, 叶绿素荧光, 保护酶

Abstract:

In order to study the effects of shading on the growth and photosynthetic characteristics of purple-leaf Lagerstroemia indica, and to clarify the adaptability of purple-leaf Lagerstroemia indica to different light intensities, four different light intensity levels (L1(CK), L2 (light shade), L3 (moderate shade) and L4 (heavy shade)) were set through shading methods. The physiological and biochemical indexes of two purple-leaf Lagerstroemia indica varieties, such as specific leaf weight (SLW), light response curve, chlorophyll fluorescence parameters and antioxidant enzymes were determined. With the increase of shading degree, the results showed that the leaf area and photosynthetic pigment content of Lagerstroemia indica ‘Midnight’ and Lagerstroemia indica ‘Chocolate’ increased, while the results of SLW decreased. The net photosynthetic rate (Pn) of Lagerstroemia indica ‘Midnight’ and Lagerstroemia indica ‘Chocolate’ increased gradually with the increase of light intensity (PAR). When PAR > 800 µmol/(m·s), the increase of Pn gradually slowed down and finally reached light saturation. The light saturation point and light compensation point of Lagerstroemia indica ‘Midnight’ and Lagerstroemia indica ‘Chocolate’ under L1 light intensity were significantly lower than those of other shading treatments, and Pmax (maximum net photosynthetic rate) of both Lagerstroemia indica varieties increased first and then decreased with the increase of shading degree. The Pn of Lagerstroemia indica ‘Midnight’ and Lagerstroemia indica ‘Chocolate’ increased gradually with the increase of CO2 concentration, while the Pn tended to increase slowly with the increase of Ci (Intercellular CO2 concentration) > 1000(µmol/mol). The CO2 compensation points of Lagerstroemia indica ‘Midnight’ and Lagerstroemia indica ‘Chocolate’ decreased with increasing shading. Y(II) (Actual photochemical quantum efficiency) of Lagerstroemia indica ‘Chocolate’ increased with the increase of shading degree, while Y (NO) (Quantum efficiency of fundamental heat dissipation independent of light) of Lagerstroemia indica ‘Midnight’ and Lagerstroemia indica ‘Chocolate’ decreased significantly with the increase of shading degree. The O2- production rate, H2O2 content, SOD, POD and CAT of Lagerstroemia indica ‘Midnight’ and Lagerstroemia indica ‘Chocolate’ under L1 light condition were significantly increased. In conclusion, there was a certain phenomenon of light suppression of purple-leaf Lagerstroemia indica under full light. Shading can improve the utilization rate of light energy and promote the growth and development of purple-leaf Lagerstroemia indica, which has certain adaptability to low light.

Key words: Purple-leaf Lagerstroemia indica, shade, growth, photosynthetic characteristics, chlorophyll fluorescence