Xylem vessel variability at three positions of rice root (Oryza sativa L.)
1990
Bashar, M.K. (Bangladesh Rice Research Inst., Gazipur (Bangladesh) )
Root xylem vessel numbers and areas at different positions of the roots of one African upland rice variety, Moroberekan and one semidwarf modern lowland variety, IR20 were studied. The plants were grown in hydroponic culture in a phytotron glasshouse under controlled conditions. Samples were taken from the base middle and tip of roots from randomly selected plants. Within a root, the lowland variety produced both a higher number as well as a larger area of xylem vessels at the base; the xylem vessel number and area gradually decreased at the middle and tip of the root. This trend was not observed in the upland variety. There were no significant differences among the plants and roots within plants in Moroberekan in respect of xylem vessel number or area. However, the xylem vessel number, the smallest contribution in cases of both the characters and both the varieties came from the sampling position within root. Thus, sampling should be from a certain section of the root, preferably from the tip.
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