Studies On Regional Characteristics Of Two-line System Hybrid Rice's Plant Type

In this study, using Liangyoupeijiu as test material, the field experiment were conducted at different sowing date and different ecological locations, in eight rice area of southern China. The local features and the relation between local features and environment factors are studied. The main conclusion including:(1) There is obvious regional difference in main plant type. The study show that, the plant height is shorter as latitude lower and that is obvious, and the plant height of early rice has higher than late rice. Top leaf length has the same trend to plant height, and the inverse 3 leaf length has unobvious local difference, all of which cause the increasing of inverse 3 leaf length has a reducing trend from south to north compare to top leaf. The local difference of top leaf is unobvious against to leaf length, but the inverse 3 leaf width has a obvious local difference, showing that south is wide and north is narrow., and that cause a increase trend from south to north in reducing of inverse 3 leaf width. Leaf width reducing and leaf length increasing show there is intercepted relation in vegetation canopy. The southern leaf angel is larger obviously, and the average leaf angel of early rice is lager than late one to 10%. leaf crimpness has obvious trend of reducing from south to north, and there is obvious difference between early rice and late rice . The distance of two leaves of south is shorter than north, and early rice is longer than late rice .(2) There is a relation in six plant type factors which has obvious affection to canopy structure. The study show there is obvious or very obvious positive correlation of neighboring leaf position in leaf length, leaf width, leaf angel and leaf crimpness of the upper canopy's 3 function leaves, there is obvious positive correlation between inverse 3 leaf length and leaf width, and there is negative correlation between top leaf and leaf crimpness, and between leaf angel and leaf crimpness too, plant height just has a obvious correlation to second leaf distance.(3) Variance Analysis of plant type factors on different sowing date, different year and different location proved that the impact of different location to leaf length, leaf width and leaf crimpness reach to greatest significant level, and that to F test of plant height, leaf angel and the distance between leaves reach significant level. All of which show that the main reason of liangyoupeijiu variation is the environment difference in areas.(4) Based on the observation value of plant type factors and meteorological data, we used the moving average means and stepwise regression means to choose the independent variables of our models and then the meteorological statistical models are established to predict each plant type factors.(5) Based on meteorological statistical models of every plant type factor, the plant type factor value of difference rice areas in south China is calculated, and under which meteorological factors affection to liangyoupeijiu is analyzed by each area's statistics eigen value. The results show that single rice in Yunnan-Guizhou Plateau where has higher altitude and lower latitude has shorter plant height and leaf length, wider leaf width and distance between leaves, single rice in Yangtze River of east China where has lower altitude and higher latitude has smaller leaf angel.