【摘要】 【目的】筛选宜造型冬青品种，并分析化学组分与物理性质对枝条抗弯力学特性的影响机制，为其他造型冬青品种的筛选提供理论依据。【方法】以5个冬青品种‘长青柳’(Ilex cassine‘Angustifolia’)、‘内莉’(I.בNellie R. Stevens’)、‘黄金枸骨’(I.×attenuata‘Sunny Foster’)、‘红玛瑙’(I.decidua‘Hongmanao’)、‘冬红’(I.verticillata‘Winter Red’)为研究对象，测定2.5～7.5mm共5个径级的枝条抗弯力及抗弯弹性模量(MOE),纤维素、半纤维素和木质素的含量，以及微纤丝角(MFA)及结晶度(Crl)等指标。【结果】(1)5个冬青品种的抗弯力、抗弯弹性模量(MOE)随径级增加而增大，枝条化学组分及结晶度的变化与力学性质的变化类似，微纤丝角随径级增加而减小。(2)5个冬青品种抗弯力和MOE存在显著差异(P<0.05),‘红玛瑙’的抗弯力及MOE最高，‘冬红’最低。(3)纤维素含量、综纤维素含量、结晶度与枝条的MOE呈显著正相关，微纤丝角与MOE呈显著负相关(P<0.05)。【结论】‘冬红’(MOE为154.88～645.87 MPa)及‘内莉’(MOE为212.09～772.00 MPa)的MOE显著低于其他品种，表明其枝条柔韧性更优，为适宜造型的冬青品种；而枝条纤维素、综纤维素含量、微纤丝角、结晶度等指标是影响枝条抗弯特性的主要因素。更多还原

【Abstract】 【Objective】 To screen Ilex varieties suitable for topiary and to investigate the influencing mechanisms of chemical composition and physical properties on the flexural mechanical characteristics of branches, providing a theoretical basis for selecting other Ilex varieties for topiary.【Method】 Five Ilex varieties—Ilex cassine ‘Angustifolia’, I. × ‘Nellie R. Stevens’), I. × attenuata ‘Sunny Foster’, I. decidua ‘Hongmanao’, and I. verticillata ‘Winter Red’—were selected as research subjects. The flexural force and flexural modulus of elasticity(MOE) in bending of branches across five diameter classes(2.5-7.5 mm), as well as the contents of cellulose, hemicellulose, and lignin, as well as microfibril angle(MFA), and crystallinity(Crl), were measured.【Result】(1) The flexural force and MOE of the five Ilex varieties increased with increasing branch diameter class. Changes in the chemical composition and crystallinity exhibited trends similar to those of the mechanical properties, while the MFA decreased with increasing diameter class.(2) Significant differences(P < 0.05) in flexural force and MOE were observed among the five varieties. ‘Hongmanao’ exhibited the highest values for both flexural force and MOE, whereas ‘Winter Red’ exhibited the lowest.(3) Cellulose content, holocellulose content, and crystallinity showed significant positive correlations with branch MOE, while the MFA showed a significant negative correlation with MOE(P < 0.05). 【Conclusion】 The MOE of ‘Winter Red’(MOE: 154.88-645.87 MPa) and ‘Nellie R. Stevens’(MOE: 212.09-772.00 MPa) was significantly lower than that of the other varieties, indicating their branches possess greater flexibility and are thus more suitable for topiary. Cellulose content, holocellulose content, MFA, and crystallinity are identified as key factors influencing the flexural properties of branches.更多还原