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Control of flowering of orchard grass dactylis glomerata 3. influence of fertilizer application on responsiveness to floral induction treatment in aged plants



Control of flowering of orchard grass dactylis glomerata 3. influence of fertilizer application on responsiveness to floral induction treatment in aged plants



Sochi Shikenjo Kenkyu Hokoku (17): 67-75



In orchardgrass there are 3 developmental stages, juvenile, floral-inductive and post-inductive stages. This reports the influence of fertility level and leaf trimming on the responsiveness to floral induction treatment in aged plant. Four clones with different maturity were used. The clones were grown under continuous light in warm glasshouse (25.degree. C in day/15.degree. C at night) for .apprx. 6 mo. Vigorous large tillers selected and planted in 1/5000 are Wagner pots with 4 different fertility levels; 0, 3, 6 and 12 g of compound fertilizer (N:P2O5:K2O = 14:14:14) as the none, low, medium and high fertility-levels, respectively. All of the tillers were grown for 30 days and transplanted to the medium fertility-level and subjected to floral-induction treatment with 12 h daylength and 10.degree. C for 0 (untreated), 4, 7, 10, 14 and 21 days. After the treatment heading behavior was observed under continuous light in a warm glasshouse. As the fertility level became higher, the number of days required for floral induction shortened. Untreated tillers, remained at vegetative stage even at the high fertility level. The number of days required for floral-induction differed from clone to clone; however, the degree of acceleration of floral induction with the raising of fertility level was almost the same in all clones. The responsiveness enhanced by fertilizer application did not always relate to the size of tillers, because the responses of respective clones to fertility-level differed somewhat from each other in the plant height, number of emerged leaves and dry wt. To investigate the role of leaf in the responsiveness to floral-induction treatment, the leaf blades of the tillers, which had been grown at the high fertility-level mentioned above, were trimmed off in the various ways immediately before floral-induction treatment. When the blades of the upper 3 expanded leaves were trimmed at 20 cm above the ligules, the decline in the responsiveness of the tillers was small. When 1 blade out of 3 expanded leaf blades was trimmed at 20 cm above the ligule and the residual 2 blades were trimmed at the ligules, the lower responsiveness of the tillers was observed only in the case of the short-period treatments. There was no effect of the position of the remaining leaf. It was suggested that the high responsiveness of the tiller grown under the fertilized condition was caused mainly by the physiological change in plant and partly by the increase in size of leaf blades.

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