Physiological characteristics of high-yielding [Oryza sativa] varieties: Leaf properties in relation to dry matter production and distribution
1990
Takebe, M. (Agricultural Research Center, Tsukuba, Ibaraki (Japan)) | Motomatsu, T. | Hiraoka, K. | Yoneyama, T.
The leaf properties of high-yielding semidwarf varieties (Suweon 258, Akenohoshi, Nanjing 11, Kanto 146, Kou 75) grown on an alluvial soil were investigated from 1984 to 1988 in Tsukuba, and the relation between the leaf properties and either dry matter production or distribution was considered. The leaf color, N, P and K content and dry weight of individual leaves were examined. The leaf color was examined by a phlorophyll meter SPAD501. The regression lines between the leaf color and either chlorophyll content or N content of high-yielding varieties were very close to those of a Japanese variety Musashikogane. The green color score of the uppermost three leaves of the high-yielding varieties remained high during the late growth period after panicle formation, although the lower leaves became yellow. In Suweon 258 large proportions of dry matter, N, P and K was partitioned to the upper leaves than in Musashikogane during 5 day before and 22 day after heading. In this variety the content of dry matter, N and P of culms and lower leaves decreased from August 7 (5 days before heading). In the high-yielding varieties dry matter production was maintained by active upper leaves and by active translocation of matter and nutrients from the lower leaves and culms to the grains. These characteristics may be associated with the high yield of the semidwarf varieties
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