Effects of limited space on foliage development in rice [Oryza sativa] plants.
1992
Akita K. | Tanaka N.
To investigate intra-hill competition in rice, growing space for foliage development was limited and light conditions were changed by inserting a clear or black plastic board to pots which had the same underground conditions. The plant length at panicles formation stage become longer as growing space decreased. At maturity, limiting growing space did not influence plant height. The number of tillers in shaded plots was smaller than that in non-shaded plots, and could be expressed by a linear regression between number of tillers and different growing spaces. The relationship between dry weight of leaf blade and growing space in non-shaded plots at panicles formation stage was expressed by quadratic regression curves. At heading time, relationship was expressed by linear equations in both shaded and non-shaded plots. This suggests that growth of each organ after heading varied in translocation and accumulation of internal substances. The nitrogen content percentage of leaf blades at panicle formation stage increased with decreasing growing space, and could be expressed by a linear regression; nitrogen content % was higher in shaded plots than in non-shaded plots. In non-shaded plots, however, no relationship was observed between nitrogen content percentage and growing space, indicating possible involvement of light conditions in the nitrogen content percentage. At heading time, the nitrogen content percentage of leaf blade and culms was expressed by linear equations. At maturity, in non-shaded plots varying growing space had no influence nitrogen content. In conclusion, rice plants grown under shaded conditions with more limited space had a significant reduction on the number of ears and the amount of nitrogen trnaslocated from foliage to ear. This might be associated with the sink-source relation.
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