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在干旱条件下,对矮秆基因Rht1、Rht2、Rht3和Rht1+Rht2的近等基因系以及高秆系(rht)种植7年以上,并在温室内外进行盆栽。高秆小麦到成熟时,地上部干重及叶面积指数较大;在盆栽实验中,各系相对生长率无差异,由于高秆系出土快,所以,各系间干重积累和叶片冠层发育差异较大。高秆系的同位素辨别测定值较高,而此值与叶片冠层快速生长有关。高秆和矮秆小麦的根系在1m长的试管中和1.9 m深的田间土层中,吸收水分的情况相似。然而,无论在温室还是田间,蒸腾效率(地上部干重/蒸腾水分)均随株高的降低而下降。没有证据表明高秆系的茎对同化产物的贮存和再运输能力高于矮秆系。
Under drought conditions, the proximal genes of Rht1, Rht2, Rht3 and Rht1 + Rht2 and the rht of dwarfing genes were planted for more than seven years and potted inside and outside the greenhouse. In the pot experiment, there was no difference in the relative growth rate of the lines. Because of the rapid excavated in the tall stalk, the dry weight and leaf canopy of all the lines increased Differences in development. High stalk line isotope discrimination measured values higher, and this value and leaf canopy rapid growth. Roots of high-stalk and dwarf wheat were similar in water uptake in 1-m long tubes and 1.9 m-deep field soil. However, both in the greenhouse and in the field, the transpiration efficiency (shoot dry weight / transpiration moisture) decreased with the plant height decreasing. There is no evidence that stems of tall culms are more capable of storing and re-transporting assimilate than dwarf lines.