玉黄金对春玉米茎秆显微结构及抗折强度的影响

【目的】研究化控剂(30%胺鲜酯·乙烯利水剂以下称玉黄金)对春玉米茎秆显微结构及抗折强度的影响。【方法】选取京农科728和金农738为材料,测定不同种植密度下喷施玉黄金后春玉米茎秆抗折强度,利用光学显微镜观察其茎节的显微结构,对维管束各项显微结构与茎秆抗折强度进行相关分析及通径分析。【结果】维管束数目对茎秆抗折强度的直接影响最大,且呈极显著负相关为-0.760;与木质部面积呈极显著正相关为0.970;与单个维管束平均面积、维管束最大直径和表皮细胞厚呈显著正相关分别为0.661、0.659和0.632。【结论】京农科728和金农738在不同种植密度下,喷施浓度为200 mg/L的玉黄金后茎秆单位面积内维管束数目减少、表皮厚度增厚、维管束最大直径最大、抗折强度提高,抗倒性增强。

Effects of Yuhuangjin on Microstructure and Bending Strength of Spring Maize Stem

【Objective】 To explore the effects of chemical control agent Yuhuangjin (30% prochloraz and ethephon ) on microstructure and flexural strength of spring maize stem.【Method】 Jingnongke 728 and Jinnong 738 were taken as experimental materials, the stem bending strength, the microstructure of stem and the correlation and path analysis between the microstructure of vascular bundle and the bending strength of stem were carried out.【Results】 The results showed that: the number of vascular bundles has the most direct influence on the bending strength of stem, there was an extremely significant negative correlation is -0.760; there was an extremely significant positive correlattion with xylem area, which is 0.970; it was positively correlated with the average area of single vascular bundle, the maximum diameter of vascular bundle and the thickness of epidermal cells 0.661, 0.659 and 0.632 respectively. 【Conclusion】 The number of vascular bundles of Jingnongke 728 and Jinnong 738 decreases per unit area at different planting densities after spraying 200 mg/L Yuhuangjin, but the thickness of epidermis increases, the maximum diameter of vascular bundle is the largest, the bending strength is improved, and the lodging resistance is enhanced.