Effect of water level on anatomy of rice
1983
Wilaiwum Chawanayotin (Department of Agriculture, Bangkok (Thailand). Botany and Weed Science Div.)
Rice plants used in the study grew vigorously at the age of 42-49 days after planting. This is true for all rice varieties and soil water conditions. Under nonflooded and varying water depth conditions, the floating rice stem was smaller in size than that of the lowland rice. The stem size of the lowland rice increased as the water depth was increased. This is not the case for the floating rice. The differences in soil water condition also resulted in the differences of lacuna size and vascular bundles scattering. The deeper the water level the larger the lacuna size was observed. As a result of lacuna enlargement, the vascular bundles were squeezed together and reoriented into a group of 2 to 3 bundles. In some cases the vascular bundles were formed encircling half of the enlarged lacuna. The starch grain content of the rice stem was also observed and found that the submerged stem of plants grown under varying water depth had no starch grain content at all. The starch grains were found only in the above-water stem part. The starch grain content of the stem for plants grown under nonflooded condition was found abundant
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