Study on Crown Grafting Technology of Purple-leaf Lagerstroemia indica

doi:10.11924/j.issn.1000-6850.casb2022-0683

Abstract

Abstract:

The purpose of this study is to provide theoretical basis and technical support for the crown grafting of purple-leaf Lagerstroemia indica, so as to meet the demand for the large-scale L. indica varieties of the landscape market. The survival rate and increment of three cultivars of purple-leaf L. indica (‘Ebony Fire’, ‘Ebony Flame’ and ‘Ebony Embers’) were studied by different rootstock diameter, scion diameter, grafting method and grafting period. The result showed that the crown grafting technology was applied to different cultivars of purple-leaf L. indica, which could carry out in spring, summer and autumn, and the best time was in spring. The survival rates were more than 90% by the crown grafting from late February to early March in southern China. The diameter of branches above 2 cm was better selected as rootstocks for grafting, and the best diameter of scion was 0.8-1.2 cm. The best grafting method was three knife cutting, and the grafting survival rate was 91.6%. Grafting bagging treatment in spring could significantly accelerate the healing of graft union, and the grafting survival rate could be nearly doubled. The study can provide grafting technical support for the large-scale production of elite purple-leaf L. indica varieties.

Key words: Lagerstroemia indica, crown grafting, survival rate, growth, grafting time

LI Maojuan, CUI Qiang, XU Yuze, ZHANG Haixia, LIAO Zhenni, HE Caisheng. Study on Crown Grafting Technology of Purple-leaf Lagerstroemia indica[J]. Chinese Agricultural Science Bulletin, 2023, 39(25): 21-26.

Figures/Tables 6

References 26

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砧木粗度	平均成活率/%	新稍平均生长量/cm
D≤2 cm	70.83±0.03b	31.2±1.7c
2 cm<D≤3 cm	91.67±0.04a	38.3±2.9b
3 cm<D≤4 cm	90.84±0.04a	42.8±2.7a
4 cm<D≤5 cm	92.49±0.01a	46.3±2.2a
5 cm<D≤6 cm	90.00±0.04a	45.6±1.8a
D>6 cm	90.00±0.02a	46.8±1.6a

砧木粗度	平均成活率/%	新稍平均生长量/cm
D≤2 cm	70.83±0.03b	31.2±1.7c
2 cm<D≤3 cm	91.67±0.04a	38.3±2.9b
3 cm<D≤4 cm	90.84±0.04a	42.8±2.7a
4 cm<D≤5 cm	92.49±0.01a	46.3±2.2a
5 cm<D≤6 cm	90.00±0.04a	45.6±1.8a
D>6 cm	90.00±0.02a	46.8±1.6a

接穗粗度	平均成活率/%	新稍平均生长量/cm
R≤0.4 cm	41.68±0.03e	22.4±1.7c
0.4 cm<R≤0.6 cm	60.83±0.03d	27.0±2.8b
0.6 cm<R≤0.8 cm	80.83±0.05b	35.1±2.1a
0.8 cm<R≤1.0 cm	92.49±0.01a	38.2±1.9a
1.0 cm<R≤1.2 cm	88.34±0.02a	38.5±1.9a
R>1.2 cm	69.18±0.05c	35.7±2.8a

接穗粗度	平均成活率/%	新稍平均生长量/cm
R≤0.4 cm	41.68±0.03e	22.4±1.7c
0.4 cm<R≤0.6 cm	60.83±0.03d	27.0±2.8b
0.6 cm<R≤0.8 cm	80.83±0.05b	35.1±2.1a
0.8 cm<R≤1.0 cm	92.49±0.01a	38.2±1.9a
1.0 cm<R≤1.2 cm	88.34±0.02a	38.5±1.9a
R>1.2 cm	69.18±0.05c	35.7±2.8a

嫁接方法	平均成活率/%	新稍平均生长量/cm
普通切接法	83.33±0.02b	34.1±1.3ab
三刀切接法	91.65±0.02a	36.1±2.1a
劈接法	70.83±0.01c	32.5±0.7b