| This test adopts 15 varieties which have representation and have been widely planted in production of HeiLongJiang province, and tries to expatiate on developmental rules of flax fibre through experiments of varieties and plant growth regulator substance in different varieties, relationships between endogenous hormones and fibre growth, relationships between accumulation of C and N and fibre growth, and mechanism of plant growth regulator substance affecting yield and quality of flax.It showed that fibre development of each cultivar has the consistency with growth of flax plant. Stem diameter, fiber cell quantity in cross-section of stem, long and short diameter of fiber, and fiber cell wall thickness all increase with adding of plant height and dry matter of different leaf places in the same part of stem, and all of them express continuity in time distribution. Flax fibre growth appears obvious place effect in axis space distribution, and it is not synchronous in different leaf places. It appears in turn from bottom to top, and developmental rates are also not consistent in different leaf places. So the developmental courses of each part of stem of flax plant were different.There are differences in fibre development of mature stem of different genetypes, and stem diameter of high flax varieties, fiber cell quantity in cross-section of stem, fiber cell wall thickness, long or short diameter of fiber are all more than moderate flax varieties. The number of fiber cells of stem section of linseed is the most, but these cells are smallest, and wall of the cell is thinnest. The growth of dual-purpose flax is also weak.The number of fiber cells shows positive correlation with some factors, which include long fiber ratio, intension, flexibility, straw yield, and yield of long fiber. Fiber cell wall thickness shows positive correlation with each character of yield and quality, and it appears significant positive correlation with division degree(r=0.52*), fiber content(r=0.75**), long fiber ratio(r=0.68**)and yield of long fiber(r=0.85**). Short diameter of cavity shows negative correlation with each character, significant negative correlation with fiber cell wall thickness(r=-0.54*), very notable negative correlation with straw yield(r=-0.66**)and yield of long fiber(r=-0.66**).Nitrogen content of flax show a declining trend in leaves and stems. Nitrogen content of flax stems has a sigenificant positive correlation with the number of fiber cells in the middle of stem in autumn(r=0.64*), negative correlation with short diameter of cavity. Saccharine content in leaves of each cultivar has an increasing trend, which is consistent with that of stems, reaching peak value in blooming stage, and declining to the bottom in consequence. Dynamic change of C/N in leaves and stems rise with fiber development. It has a relative consistency with stem diameter, cells number, long or short diameter of fiber, and fiber cell wall thickness. In green-ripe stage solubility saccharine content of stems shows negative correlation with short diameter of cavity, positive correlation with fiber cell wall thickness, and significant positive correlation with the number of fiber cells (r=0.67**).With the development of fiber, GA3 content in shoot declines firstly to high fiber cultivars, then increases, which takes 51 days to reach the peak after seedling, then declines quickly; moderate fiber cultivars also keep an ascending trend firstly, reaching the peak after seedling about 40 days, and then declines to the bottom gradually. IAA content of high fiber cultivars changes according to the sequence that declining firstly, rising secondly, declining lastly, especially the content declines rapidly in the last period. The rules of moderate fiber cultivars are alike, but the extent of changing is relatively mild. For different cultivars of flax, dynamic change of each hormone content in bottom and middle part of stem are consistent, namely show the changing trend like letter "V". Distribution of GA3, IAA, ZR content of f...
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