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

doi:10.11924/j.issn.1000-6850.casb2022-1024

Abstract

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 (P_n) 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 P_n 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 P_max (maximum net photosynthetic rate) of both Lagerstroemia indica varieties increased first and then decreased with the increase of shading degree. The P_n of Lagerstroemia indica ‘Midnight’ and Lagerstroemia indica ‘Chocolate’ increased gradually with the increase of CO₂ concentration, while the P_n tended to increase slowly with the increase of C_i (Intercellular CO₂concentration) > 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

MA Xiaohua, ZHANG Xule, ZHANG Yanjun, HU Qingdi, QIAN Renjuan, ZHENG Jian, TANG Zhenyong. The Influence of Shading on Growth and Photosynthetic Characteristics of Purple-leaf Lagerstroemia indica[J]. Chinese Agricultural Science Bulletin, 2023, 39(35): 61-70.

Figures/Tables 9

References 34

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处理		参数
处理		光饱和点/ LSP[µmol/(m²·s)]	光补偿点/ LCP/[µmol/(m²·s)]	最大净光合速率/ P_max [µmol/(m²·s)]	CO₂补偿点/CDCP (μmol /mol)
午夜紫薇	L₁	632.33±20.65d	15.33±2.08b	8.92±1.73d	36.70±3.85a
	L₂	917.67±6.66a	28.33±6.51a	14.25±3.29a	25.28±4.92a
	L₃	867.33±17.24b	28.67±3.06 a	12.74±0.96b	22.68±6.15b
	L₄	702.25±5.46c	26.25±8.81a	10.92±2.08c	19.93±1.64c
巧克力紫薇	L₁	722.33±6.26c	22.33±3.79b	9.13±2.32c	33.94±1.70a
	L₂	902.33±10.02a	38.33±3.26a	11.95±2.18a	26.24±2.36a
	L₃	841.33±27.01b	42.67±5.01a	10.25±1.88b	20.03±2.45b
	L₄	802.45±27.01b	35.82±3.05a	9.46±1.33c	13.93±1.29c

处理		参数
处理		光饱和点/ LSP[µmol/(m²·s)]	光补偿点/ LCP/[µmol/(m²·s)]	最大净光合速率/ P_max [µmol/(m²·s)]	CO₂补偿点/CDCP (μmol /mol)
午夜紫薇	L₁	632.33±20.65d	15.33±2.08b	8.92±1.73d	36.70±3.85a
	L₂	917.67±6.66a	28.33±6.51a	14.25±3.29a	25.28±4.92a
	L₃	867.33±17.24b	28.67±3.06 a	12.74±0.96b	22.68±6.15b
	L₄	702.25±5.46c	26.25±8.81a	10.92±2.08c	19.93±1.64c
巧克力紫薇	L₁	722.33±6.26c	22.33±3.79b	9.13±2.32c	33.94±1.70a
	L₂	902.33±10.02a	38.33±3.26a	11.95±2.18a	26.24±2.36a
	L₃	841.33±27.01b	42.67±5.01a	10.25±1.88b	20.03±2.45b
	L₄	802.45±27.01b	35.82±3.05a	9.46±1.33c	13.93±1.29c