温度および日射量に対するタイヌビエの初期生育反応

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This study showed that the growth in early stage of fourteen local populations of barnyardgrass (Echinochloa oryzicola Vasing) in seedlingcases had depended on different temperatures and light intensities. Three levels of light intensity i. e. 100, 40, and 25% were provided by shading treatments during each of two seasons, when average air temperature was 33.3 or 24.3℃ for the 23-day growth period. Results of this study are summarized as follows; 1) Crop growth rate (CGR), leaf area (LA) and net assimilation rate (NAR) increased as light intensity approached the level of full sunshine, and under the same light intensity these parameters increased at the higher air temperature. 2) The differences among fourteen populations tested were recognized to be greater in CGR and LA than in NAR. Much higher significant correlation coefficient was obtained between CGR and LA than between CGR and NAR. 3) From data on individual variation within populations expressed by the coefficint of variance on plant height and number of leaves, the degrees of variation decreased as light intensity approached full sunshine, and these degrees, on the contrary, showed a tendency to increase under the lower light intensity. 4) The degrees of phenotypic plasticity expressed by the coefficient of variance of CGR, LA and NAR which were obtained under the six different environments decreased in the order of CGR, NAR and LA, and differences between populations were also revealed on these characters. 5) Significant negative correlation was attained between the degrees of phenotypic plasticity and the individual variations within populations tested in this trial. According to these results, it is presumed that the complemental effects of the above two characters act mutually to the change of environment.
日本雑草学会の論文
1981-11-25

温度および日射量に対するタイヌビエの初期生育反応

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