|
To the Northern Japonica varieties Liaojing 294 and Yanfeng 47 as test materials, compare the two varieties after flowering to 22 d spike on different parts of a secondary rachis Caryopses back vascular anatomical structure, caryopsis development process mesocarp structure, the structure of the aleurone layer, endosperm starch grains morphological changes, enriched grain quality and grain filling characteristics, and the caryopsis back vascular traits and Rice Quality carry out the analysis, the results showed that: 1, two varieties of caryopsis dorsal vascular bundle cross-section are approximate oval, its size and the length of the minor axis of dynamic changes to a parabolic curve with the growth of caryopsis Liaojing 294 after flowering, Yanfeng 47 10 d after flowering, respectively, the maximum cross-section of the length of the major axis with the caryopsis growth and grouting process was monotonically increasing. Overall, of two varieties caryopsis back Vascular performance from coarse to fine tube - bundle structure from the base to the top, from the center of the the catheter beam and the surrounding certain sieve bundle composition. The same number of days after flowering varieties of vascular cross-sectional area, the cross-sectional length of the major axis of cross-section of the length of the minor axis of the sieve tube the width of the area, the number of catheter, grains volume, grains dry mass, showed upper primary branches Grain gt ; the lower part of the primary branches grain gt; the upper secondary branches grains gt; lower secondary branches grains, and on the same part, vascular traits showed for Liaojing 294 is greater than the abundance of salt 47.2, two varieties of caryopsis during the development of of the mesocarp structure, aleurone layer, endosperm starch grains such as observed in the grain when young, layers of cells is clearly visible from the outside to the inside: exocarp, mesocarp, horizontal cells, tubular cell layer, within the cortex. Aleurone caryopsis development. 8-10 d has been basically formed, and in the caryopsis around different parts of the aleurone cell layers are different: most of the side of a layer of cells, and close to the back of the vascular layer more generally 3 to 6 layers of cells. Two japonica rice varieties dorsal and ventral endosperm starch granules within the SEM observation found that two species of the back and abdomen endosperm cells within the starch granules are polyhedral crystal structure, arranged in dense, a smaller gap between the particles; caryopsis around the edge of the starch grains in a state of scattered, mostly spherical, loosely arranged, there are many gaps in the starch grains. Endosperm cell starch grains loosely arranged and enrich the poor rice chalky. On grain filling characteristics from the point of view, the ultimate amount of growth and maximum filling rate, two different varieties of grain positions were shown for the upper part of the rachis gt; the lower part of a branch, gt; the upper secondary rachis gt; lower part of the secondary branch variation; initial growth potential and the time of maximum filling rate, two different varieties of grain position were shown the upper rachis gt; upper secondary branch gt; lower rachis gt; lower secondary branch. Analysis of the two species has different grain filling rate changes, two different varieties of grain positions showed the upper rachis lt; lower part of the primary branches lt; upper secondary branch lt; lower secondary branch; the two varieties Grains weight gain dynamics analysis showed that the two varieties of the grain growth of the different grain positions and early performance upper rachis gt; the upper secondary rachis gt; the lower part rachis gt; lower part of the secondary branch, to grain weight gain leveled off time is expressed as the upper rachis gt; the lower part rachis gt; the upper secondary rachis gt; lower part of the secondary branch. 4, correlation analysis showed that the back of the caryopsis vascular cross-sectional area and its major axis length was significantly negatively correlated with rice chalky grain rate and chalkiness vascular cross-sectional area, length of the long axis, short axis length, screenless area width and the number of catheter caryopsis dry mass, grains enrich and grain filling was a significant positive correlation. The caryopsis back of vascular cross-sectional area, length of the long axis, short axis length the sieve tube the width of the area and the number of catheter with maximum grain filling rate showed significant or highly significant positive correlation was significant or very significant negative correlation time and up to the maximum filling rate; sieve tube the width of the area average and initial growth potential and the ultimate growth potential was a significant positive correlation. The results showed that, the caryopsis back vascular differences in the structure Chalkiness traits, differences of caryopsis enrich and Other Accumulation and Assimilation traits important morphological and anatomical basis.
|