小麦抗寒性机理研究

根据小麦生长规律,许多品种在发育过程中需要一定时间和强度的低温,但极端的温度对产量构成因素的协调提高有不利影响,这种反应是遗传决定的,如小麦的抗寒性。冬季的严酷条件可以减少单位面积内植株数目和降低存活植株的生活力从而对第一个产量构成因素产生不利的影响。有效分蘖力高的品种可以部分地或全部地弥补冬季的损失。可是人们的目的在于使秋季生长的植株全部能够存活下来,这样能形成较多主穗从而对第二和第三个产量构成因素有利。就小麦品种抗寒性、冻害产生的机理进行了论述,以期对培育出的小麦新品系进行抗寒性评价,并对选育该类小麦品种的方法进行探讨。

Study on Mechanism of Cold Resistance in Wheat

Though its well - known that it is necessary for lots of wheat lines to experience certain time duration or cold intensity during their growth, surplus temperature limits synergistical improvement of yield components, which is determined by genetices like cold resistance of wheat. The severe coldiness in winter could badly influence the first yield component through reducing of plant number in unit area of land, or lowering viability of the surval seedling. The lines with high available tillering ability could partly or totally make up for loss in winter, but it is the aim to make all autumn plants survive the winter to form more prime ear for improvment of the second and the third yileld components. Present paper discussed the mechanism of cold resistance and cold injury on purpose to evalue the cold resistance of the newly developed wheat lines and approach for breeding method for the like wheat lines.