高产小麦生育后期影响茎秆生长的生理因素与抗倒性的关系

Relationship between Lodging Resistance and Physiological Factors about Stem Growth of High-yielding Wheat in Late Growth Period

选用4个倒伏性状不同的高产小麦品系山农0482、0436、9540、9651,在大田条件下,研究其生育后期影响茎秆生长和其力学特性的因子与倒伏性状的相互关系。结果表明,小麦茎秆机械组织厚、细胞层数多、植株重心较低、基部节间单维管束面积和周长较大、株高相近而穗下节间较长以及植株高度构成指数较大的植株抗倒力较大。小麦茎秆的组织结构、抗折力、株高构成指数三个方面显示了小麦的抗倒伏能力,抗倒力从大到小依次为0482、9651、9540、0436。

In the paper, the relationship between lodging character and stem characteristics of the high - yielding wheat varieties 0482, 0436, 9540 and 9651 with different lodging characteristics were studied in field. The results indicated that it was possible to prevent lodging of wheat plants by choosing varieties with thicker mechanical tissues, more cell layers, lower gravity center of plant, larger area and longer perimeter of single vascular bundle in basal internode, longer peduncle with near plant height and higher component index of plant height. According to the tissue structure, stem strength and the component index of plant height, the lodging -resistant abilities of these wheat varieties indicated 0482 〉 9651 〉 9540 〉 0436.